Abstract
Cell–cell adhesion is at the center of structure and dynamics of epithelial tissue. E-cadherin–catenin complexes mediate Ca2+-dependent trans-homodimerization and constitute the kernel of adherens junctions. Beyond the basic function of cell–cell adhesion, recent progress sheds light the dynamics and interwind interactions of individual E-cadherin–catenin complex with E-cadherin superclusters, contractile actomyosin and mechanics of the cortex and adhesion. The nanoscale architecture of E-cadherin complexes together with cis-interactions and interactions with cortical actomyosin adjust to junctional tension and mechano-transduction by reinforcement or weakening of specific features of the interactions. Although post-translational modifications such as phosphorylation and glycosylation have been implicated, their role for specific aspects of in E-cadherin function has remained unclear. Here, we provide an overview of the E-cadherin complex in epithelial cell and tissue morphogenesis focusing on nanoscale architectures by super-resolution approaches and post-translational modifications from recent, in particular in vivo, studies. Furthermore, we review the computational modelling in E-cadherin complexes and highlight how computational modelling has contributed to a deeper understanding of the E-cadherin complexes.
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Introduction
Adhesion molecules and complexes mediating specific cell–cell contacts are central to the evolution of metazoan species. Formation, maintenance, dynamics, and specificity of such adhesion complexes are key to tissue development, organization, morphogenesis, homeostasis, and function. In epithelial tissues conserved complexes of E-cadherin provide cell adhesion (Fig. 1A, B).
The single span transmembrane protein E-cadherin binds to a corresponding E-cadherin molecule in the plasma membrane of the adjacent cells, termed a trans complex. The homophilic complex relies on Ca2+-dependent homodimerization of one of its extracellular domains (Fig. 1). On the cytoplasmic side, the short C-terminal tail of E-cadherin binds to β-catenin and p120-catenin. β-Catenin further binds to α-catenin. Given the binding sites in α-catenin to components of the actomyosin cytoskeleton, the cadherin–catenin complexes bridge the force-generating actomyosin cortices of two adhering cells and are at the center of force transmission between cells. Cadherin–catenin complexes together with their associated components play multiple functions in cell adhesion, adhesion tension, cortical link and mechano-signaling. All these functions and their regulation mechanisms have been investigated in wide range of experimental systems and species, including mammalian cell cultures and model organisms (Bertocchi et al. 2017; Lecuit et al. 2011; Wang et al. 2012; Zaidel-Bar 2013). Evolutionary rate covariation analysis indicates that α-catenin, p120-catenin and E-cadherin evolved under similar selective pressures during evolution between Drosophila species (Raza et al. 2019). The key interactions of the cadherin complexes are conserved between bilaterians and cnidarians. It was demonstrated that the cadherin–catenin complex are conserved in the Sea Anemone Nematostella vectensis (Clarke et al. 2016). In N. vectensis, the heterodimer of α-catenin and β-catenin bind N. vectensis Cadherin-1 and -2 forming the cadherin complexes. The complexes bind F-actin via α-catenin. The architecture of cadherin–catenin complexes influences their functions, and these functions often regulate and influence each other. Furthermore, post-translational modifications contribute to and regulate the functions of E-cadherin as all other transmembrane proteins. Post-translational modifications may, therefore, alter the architecture, stabilization, adhesion tension, and mechano-signaling functions.
There has been a series of excellent and comprehensive reviews discussing the adherens junctions from various perspectives. Here, we review variations of the stereotypic cadherin–catenin complex and findings from in vivo studies focusing on nanoscale architectures by super-resolution approaches and post-translational modifications. We end this review by highlighting how computational modelling has contributed to a deeper understanding of the E-cadherin complexes.
E-cadherin complexes
E-cadherin was initially identified as an 84-kDa glycoprotein (gp80) protein mediating Ca2+-dependent cell adhesion and embryonic compaction in mouse embryos (Boller et al. 1985; Hyafil et al. 1980, 1981; Yoshida and Takeichi 1982). Evolutionary conservation was revealed by cloning and characterization of the shotgut gene, which encodes Drosophila E-cadherin (DE-cadherin) (Oda et al. 1994; Tepass et al. 1996; Uemura et al. 1996). Despite similarities in function and structure, E-cadherin in vertebrates and invertebrates displays distinct structural differences. Mature human E-cadherin protein contains an extracellular domain with five extracellular cadherins (EC) repeats (Fig. 1B) (Van Roy and Berx 2008). In contrast, the extracellular region of DE-cadherin contains seven EC repeats, followed by a cysteine-rich region, an EGF-like region and a laminin G domain. Within the cysteine-rich region, DE-cadherin is proteolytically cleaved into two polypeptides that remain associated via noncovalent interactions and functionally behave similar to the mouse E-cadherin molecule (Fig. 1B) (Oda and Tsukita 1999). A second variation concerns the trans complex (Fig. 1B). In vertebrates the distal most extracellular domain 1 (EC1) mediates Ca2+-dependent dimerization (Harrison et al. 2011), whereas medial EC3 and EC4 are responsible for trans-dimerization in Drosophila (Fig. 1B) (Nishiguchi et al. 2016). The function of the distal EC1 and EC2 domains of DE-cadherin has remained unclear.
The E-cadherin cytoplasmic tail contains a binding site for p120-catenin and β-catenin (Armadillo/Arm in Drosophila) (Pai et al. 1996; Yap et al. 1998). β-Catenin forms a stable complex with the vinculin homology domain 1 (VH1) of α-catenin and in this way assembles the stereotypic trimeric cadherin–catenin complex. One β-catenin molecule is associated with one α-catenin molecule (Aberle et al. 1994). The stoichiometry of α-catenin with E-cadherin appears to depend on the specific conditions and may be influenced by the F-actin association. α-Catenin can form a homodimer, which more strongly binds to F-actin than monomeric a-catenin or a trimeric cadherin–catenin complex (Drees et al. 2005).
Although not essential for viability, Drosophila p120-catenin and its binding site within E-cadherin support cell adhesion (Myster et al. 2003; Pettitt 2005). P120 influences E-cadherin turnover in the human cell line SW48 (Davis et al. 2003). Similarly, p120-catenin is involved in endocytosis of dynamic E-cadherin and Bazooka complexes in Drosophila embryos (Bulgakova and Brown 2016) and in E-cadherin turnover and epithelial viscoelasticity in Drosophila wing epithelium (Iyer et al. 2019).
Typical tight junctions are absent in invertebrates (Fig. 1A). The epithelial barrier function is provided by septate junctions. Despite this absence, the homolog of ZO-1/2 in Drosophila, Polychaetoid (Pyd), is expressed in the embryonic epidermis (Schmidt et al. 2023). Pyd colocalizes with adherens junctions to the sub-apical region, however, exhibited a distinct localization to strands that extend out from the region occupied by core junction proteins. Pyd reinforced cell junctions and facilitates cell rearrangements during germband extension.
The nanoscale architecture of E-cadherin complexes
Cadherin-based cell adhesions is mediated by complexes with changing composition and stoichiometry. In addition to the trans complex mentioned above, the trimeric of E-cadherin, β-catenin and a-catenin complex multimerizes to clusters of up to several hundred molecules, designated cis complexes. The cis cluster are assumed to come in two types: as paired clusters engaged in trans homophilic binding and as unpaired cluster with no juxta-positioned cluster in the other cell. Being in at the nano meter scale, analysis of the paired and unpaired cis clusters requires super-resolution microscopy (Schermelleh et al. 2019). Beside homomeric clusters, E-cadherin complexes engage in dynamic interactions with numerous of junction- and cortex-associated proteins, with diverse and often cell-type-specific functions for cell adhesion, cell and tissue tension, and signaling during cell and tissue morphogenesis (Fig. 2). Understanding the dynamics and stoichiometry of these multi-protein assemblies is essential for understanding the physiological role of E-cadherin during cell and tissue morphogenesis.
The nanoscale architecture of adherens junction was analyzed in detail by transmission electron microscopy for several epithelial cell types (Buckley et al. 2014; Yonemura et al. 1995). Despite the availability of immunocolloidal gold technology, the composition and distribution of specific components within the junctions is difficult to image given the complex sample preparation process (Tepass and Hartenstein 1994). In contrast, fluorescence microscopy provides labelling specificity, double labelling, and sufficient sensitivity for detection of adherens junctions components (Sahl et al. 2017). The resolution of diffraction-based fluorescence microscopy is limited by Abbe's law to about 200–250 nm in lateral direction and 500–700 nm in axial direction (Shao et al. 2011). Super-resolution techniques allow imaging below the diffraction limit, in principle towards the single digit nanometer scale. Several studies have applied super-resolution microscopy techniques to the nanoscale architecture of E-cadherin complexes in vivo and in cultured cells during last decade (Fig. 3). The techniques, their advantages, challenges, and potential in vivo applications are discussed in Box 1.
With both SIM (Structured Illumination Microscopy) and STED (STimulated Emission Depletion) microscopy a lateral resolution below 100 nm can easily be achieved, and both benefit from the straightforward sample preparation and imaging acquisition (in Box 1). However, it is technically challenging to improve the resolution to 50 nm, the size of a trans complex, by STED and SIM. Cadherin and nectin, another adhesion molecule, were detected in separate clusters at adherens junctions in A431 cells (epidermoid carcinoma) and human keratinocytes (Indra et al. 2013). In cultured human epithelial cells, flotillin colocalized and formed complexes with cadherin at cell junctions in F-actin-rich regions (Guillaume et al. 2013). STED imaging was applied to dissect the molecular organization of focal adherens junctions and revealed that rather than part of the VE–cadherin complex, the F-BAR protein pacsin2 decorates around the VE–cadherin-based adhesion structure (Dorland et al. 2016). In MDCK cells, a SIM study revealed a direct structural connection of activated Vinculin with β-catenin (Bertocchi et al. 2019). Furthermore, a recent study combined the SIM with a calcium switch assay and visualized reassembly of the supramolecular actomyosin array at the zonula adherens. These findings support the model that myosin arrays bundles actin at mature junctions (Yu-Kemp et al. 2021). Clusters of E-cadherin at adherens junctions were visualized by STED microscopy at the lateral membrane of 3D MDCK cysts (Maraspini et al. 2019). In addition, E-cadherin was detected in nascent desmosomes via SIM, providing support for a role of E-cadherin in early desmosome assembly (Shafraz et al. 2018). A recent SIM study with Drosophila embryos during germband extension revealed that cadherin–catenin complex and Canoe/Afadin both localize to distinct puncta along the junctional membrane (Schmidt et al. 2023). Both methods allow rapid and multicolor imaging. Furthermore, by live-imaging with STED (Grimm et al. 2017), the nanoscale dynamics of adherens junctions proteins and actomyosin cytoskeleton can be visualized during tissue morphogenesis. STED can be combined with optogenetic and optochemical approaches (Kong and Großhans 2022; Krueger and De Renzis 2022), fluorescence correlation spectroscopy (FCS), and fluorescence lifetime imaging microscopy (FLIM) to investigate the in vivo function of adherens junctions components and associating proteins.
SMLMs (Single-Molecule Localization Microscopies) provide a lateral resolution of less than 40 nm and are, therefore, the method of choice for analysis of E-cadherin complexes with the distance between the two cytoplasmic tails of a trans E-cadherin complex of about 40 nm (Boggon et al. 2002). STORM (STochastic Optical Reconstruction Microscopy) imaging with cultured A431D cells revealed that loose clusters of approximately five E-cadherin molecules were delimited by a ‘‘fence’’ of F-actin (Wu et al. 2015). Employing a combination of iPALM (interferometric Photo Activated Localization Microscopy) and SIM in MDCK cells, the E-cadherin core complex could be distinctly imaged from the actin cortex and an interface zone containing Vinculin (Bertocchi et al. 2017). In this model, α-catenin determined the position of Vinculin. In the open conformation of α-catenin, Vinculin in a band of about 30 nm overlapped cadherin–catenin on the one side and F-actin on the other side. STORM data of human intestinal biopsies and cultured Caco2 cells indicate that nectins, rather than E-cadherin, are the major connectors of actin belts at the zonula adherens (Mangeol et al. 2019). Applying STORM to MDCK-II and PZ-HPV-7 cells, a recent study focused on the axial view of noncancerous junctions (Naser et al. 2022). In these samples, β-catenin and p120-catenin colocalized each other with cell junction proteins. Although through overexpression, the in vivo application of quantitative PLAM revealed E-cadherin cluster organization and molecular size in Drosophila embryos (Quang et al. 2013). The E-cadherin clusters were estimated to contain more than 50 molecules, and the distribution of cluster sizes followed power-law distributions with an exponential cutoff.
With these super-resolution studies, the uneven distribution and clustering of E-cadherin along the adherens junctions could be resolved. The two ends of the trans-complex are ~ 40 nm apart, yet so far they have not been imaged with an optical microscope (Boggon et al. 2002). As this distance is within the resolution of SMLMs methods, the two parallel sides of adherens junctions should be resolvable with a labeling the E-cadherin cytoplasmic tails or β-catenin. In this case, paired and unpaired E-cadherin clusters of adherens junctions could be distinguished, including their relationship to components of the actin cortex by multicolor imaging. In practice, however, we have to await such a visualization, yet. Another SMLMs technology, DNA–PAINT (DNA Points Accumulation for Imaging in Nanoscale Topography) has shown its strengths and multicolor imaging and promises to push forward the current limits in nanoscopic imaging of E-cadherin complexes (Cheng et al. 2021). In addition, ExM (Expansion Microscopy) and CLEM (Correlative Light and Electron Microscopy) provide alternative way to reveal the nanoscale architectures of adherens junction complexes.
Link to the cytoskeleton and cell cortex
Α-catenin is the linker of cadherin–catenin complexes to the cortical actomyosin cytoskeleton (Fig. 1C, D). Deletion of the α-catenin linker domain disrupts the cadherin–catenin complex and its interactions with F-actin (Watabe-Uchida et al. 1998). α-Catenin binds to F-actin either directly, or it forms complexes with actin-binding proteins, such as Formin, Arp2/3, Vinculin, and EPLIN (Desai et al. 2013; Kobielak and Fuchs 2004; Watabe-Uchida et al. 1998; Yonemura et al. 2010). Importantly, this link is dynamic and depends on the mechanics of adherens junctions leading to a reinforcement under mechanical tension. The cadherin–catenin complexes show stronger binding to actin filaments in an in vitro system when under tension (Buckley et al. 2014). A recent study revealed that α-catenin clustering together with intracellular tension engage a fluid-to-solid-phase transition at the membrane–cytoskeleton interface (Arbore et al. 2022).
α-Catenin reversibly switches to an open conformation when mechanical force is applied. In the context of adherens junctions the pulling force between two adhering cells is sensed by the number of open conformations of α-catenin (Fig. 1C) (Yao et al. 2014). The force-dependent conformational change exposes binding sites for Vinculin, at least, and thus reinforces the cortical link or triggers mechanotransduction pathways (Bertocchi et al. 2017; Kong et al. 2019). Vinculin activation and positioning depends on tension or tyrosine phosphorylation, for which α-catenin plays a vital role (Bertocchi et al. 2017). A series of in vivo studies using Drosophila embryos supports this view. As Drosophila Vinculin is recruited to α-catenin in adhesion complexes, the ratio between Vinculin and E-cadherin provides a quantitative readout for mechanical forces at adherens junctions during tissue morphogenesis (Cavey et al. 2008; Engl et al. 2014). The Vinculin D1 domain, which binds to the open conformation of α-catenin, may serve as an in vivo tension reporter. Such a Vinculin D1-GFP reporter is rapidly recruited to cell junctions in the contracting cells (Bertocchi et al. 2017; Lv et al. 2022; Kong and Großhans 2022; Kong et al. 2019; Krueger and De Renzis 2022). A recent study reports that the M region of α-catenin is required for cell adhesion during morphogenesis, in particular the M2 domain at contacts that experience higher tension in Drosophila embryos. It has been revealed that Vinculin, Jub, and Canoe/Afadin are recruited differentially to enhance adhesion by three distinct tension states reading of α-catenin mechano-sensing during tissue morphogenesis (Sheppard et al. 2022). Cadherin–catenin complex associated protein srGAP was revealed to bind to the M domain of α-catenin, where it strengthens cadherin-dependent adhesion during C. elegans morphogenesis (Serre et al. 2022).
In addition, α-catenin interacts with several proteins and their regulators of cell–cell adhesion by less defined mechanisms. Cadherin–catenin complex associated proteins (CAPs) interact with Cadherin–catenin complex also outside of adherens junctions in A431 cells (Troyanovsky et al. 2021), where they are organized in separate cluster, such as Scribble and Erbin that are two scaffolding proteins belonging to the LAP protein family. The authors suggest that CAP clustering may organize cytoplasmic proteins into distinct domains and in this way may synchronize signaling networks between adhering cells. Similarly, Afadin was found to regulate actomyosin organization through α-catenin at adherens junctions in EpH4 cells (Sakakibara et al. 2020). Canoe/Afadin localizes to puncta along the junctional membrane differently than cadherin–catenin complex in Drosophila embryonic epithermal during tissue elongation (Schmidt et al. 2023).
The cortical interactions represent an essential part in the dynamics and functions of E-cadherin–catenin complexes (Fig. 1C, D). In vitro studies with cultured cells have allowed us to assess the time course of a variety of processes and events leading to E-cadherin-based initial cell–cell contacts and mature adherens junctions. Adjacent cells make initial contacts with Ca2+-dependent and E-cadherin-based trans-interactions between protrusions, which involve branched, Arp2/3-dependent actin networks (Kovacs et al. 2002; Le Clainche and Carlier 2008; Verma et al. 2004). The protrusions depend on actin polymerization at apical junctions to maintain and stabilize cell–cell adhesion (Li et al. 2020, 2021). Maturation into stable adherens junctions requires mechanical tension and actomyosin contractility (Heuzé et al. 2019; Mège and Ishiyama 2017; Said et al. 2022). Consistent with this view from cultured cells are studies in vivo. Studies in Zebrafish embryonic primary cells indicate a role of cadherins in contact expansion and cell sorting. During zebrafish gastrulation cells of different germ layers segregate due to differences in cortical tension at the cell–cell contacts; this study challenged the conventional view that differential cell adhesion is at the center-stage of cell sorting (Maître et al. 2012). A recent study from zebrafish supports the role of cortical tension by revealing a nonlinear relationship between cortex tension and cell–cell contact size (Slováková et al. 2022); the authors revealed a linear relation at low tension, while small contact areas were promoted at high cortical tensions. In Drosophila embryos, both knockdown of α-catenin and decreased junctional contractility via RhoGEF2 RNAi reduced E-cadherin levels at cell junctions (Cavey et al. 2008; Kale et al. 2018). More in vivo studies are required for clarification of mechanisms leading to maturation of adherens junctions.
E-cadherin–catenin complexes form spot-like structures with an uneven distribution along the cell–cell contact both in vertebrate and invertebrate epidermis (Fig. 1D) (Harris and Peifer 2004; Hong et al. 2010; Müller and Wieschaus 1996; Patel et al. 2006). The E-cadherin spots represent nano-clusters with diameters in the range of 50 nm and micro-clusters with diameters of 1–2 μm (micrometers) (Yap et al. 2015). The E-cadherin clusters require cis-interactions, binding of molecules within the plasma membrane of the same cells (Quang et al. 2013; Takeichi 1991; Zhu et al. 2003). Cis-interaction in mammalian cells require the extracellular EC1 and EC2 domains (Brasch et al. 2011). Cis and trans interactions are interdependent as they mutually promote the respective interactions (Thompson et al. 2021). Although cis-complexes were observed and characterized in Drosophila embryos and primary hemocytes (Chandran et al. 2021; Quang et al. 2013), the structural requirements with respect to extracellular domains have not yet been defined. In addition, the intracellular p120–catenin protein appears to contribute to cis interactions (Vu et al. 2021). Studies both in mammalian cells in culture and Drosophila primary hemocytes suggest that extracellular cis-interactions initiate E-cadherin oligomeric complexes, whereas cortical actomyosin promotes higher order nanoclusters, which are necessary for stable cell adhesions (Chandran et al. 2021; Shewan et al. 2005; Smutny et al. 2010; Wu et al. 2015). The degree of clustering can be assayed by fluorescence recovery after photobleaching (FRAP) in vivo. In FRAP experiments, fluorescence of E-cadherin within clusters does not recover within many minutes, both in Drosophila embryos and suspension cultured cell doublets (Cavey et al. 2008; Engl et al. 2014), indicating a slow exchange of molecules within clusters. The clustering and immobilization of E-cadherin requires α-catenin or the cortical contractility in zebrafish embryos (Slováková et al. 2022).
Link of E-cadherin complexes with mechano-gated ion channels
Beside interaction with cortical actomyosin, E-cadherin may interact with mechanogated ion channels as an alternative mechanism of mechano-transduction (Roy Choudhury et al. 2021). The precedence for such a mechanism comes from hair cells in auditory sensory systems, where Cadherin-15 is tightly associated with the putative mechanogated channel Tmc (Choudhary et al. 2020; Jeong et al. 2022). Study in keratinocytes HEK293 cells revealed that Transient Receptor Potential (TRP) channel TRPV4 channel expression is required for the normal cell–cell junctions of skin epithelium (Sokabe et al. 2010). Recently, an interaction was found between E-cadherin–β-catenin complexes and the mechano-gated channel Piezo in the context of F-actin-dependent gating (Wang et al. 2022). Ca2+ entry via the mechanosensitive channel Piezo assembles E-cad at invasive protrusions during cell dissemination in Drosophila (Cabrera et al. 2021). In addition to the mechano-gated ion channels, TMEM16A, a calcium-activated chloride channel, represses E-cadherin expression in gastric cancer cells (Liu et al. 2015). However, E-cadherin staining was reduced in TMEM16A knock-out mouse inner medullary collecting duct cells (He et al. 2017). It will promote a better understanding of the morphodynamics to investigate how E-cadherin complexes coordinate mechano-gated ion channels for mechanotransduction during tissue morphogenesis.
Post-translational modifications of E-cadherin complexes
As most, if not all, proteins passing through the secretory pathway of ER and Golgi, E-cadherin is glycosylated on its extracellular part. In addition, further post-translational modifications have been detected, such as phosphorylation and ubiquitination. Several studies from the last decades have investigated functional implication of these modifications on cell–cell adhesion, protein trafficking, carcinoma progression, and tissue homeostasis. However, a comprehensive reviews of the corresponding literature is lacking. In the following paragraphs, we focus on the phosphorylation and glycosylation to summaries the recent studies about Post-translational modifications of E-cadherin complexes.
Phosphorylation
Multiple phosphorylation sites have been identified in the intracellular portion of E-cadherin (Fig. 4A) (McEwen et al. 2014) going back to initial studies about E-cadherin phosphorylation during compaction in the mouse embryo (Sefton et al. 1992). Eight phosphorylation sites have been identified in human E-cadherin, with five serine residues (Ser 770, 793, 838, 840, and 846, Uniprot P12830) and three tyrosine residues (Tyr 753, 754, and 755, Uniprot P12830) (Bian et al. 2014; Mukherjee et al. 2012). Five sites (Ser 2839, 2909, 2915, 2918, threonine 2912, Uniprot Q967F4) were reported in C. elegans (Choi et al. 2015). There are five potential phosphorylation sites of serine residues (Ser 1454, 1457, 1459, 1460 and 1463, Uniport 12,830) in Drosophila E-cadherin (Chen et al. 2017), among which one site (Ser 1493, Uniprot Q24298) has been conformed (Fig. 4A) (Zhai et al. 2008).
Phosphorylation of Ser appears to be involved in binding of β-catenin, as mutation to alanine reduced complex formation (McEwen et al. 2014; Stappert and Kemler 1994). Casein kinase II (CK2) and glycogen synthase kinase 3 (GSK-3β) are potential protein kinases for these sites, as an impact has been observed on enhanced β-catenin binding, reduced endocytosis, and increased junction formation (Choi et al. 2006; Lickert et al. 2000; Serres et al. 2000). Mutation of serine 1212 in C. elegans impairs cell adhesion and embryonic development (Choi et al. 2015). Studies in Drosophila suggested that phosphorylation of E-cadherin is not required for adherens junctions formation but does enhance the recruitment of β-catenin by E-cadherin in vivo (Chen et al. 2017).
Src is a candidate protein kinase for the tyrosine sites. Phosphorylation of tyrosine 754 by Src kinase as well as over-activation of c-Met and EGFR lead to an interaction with Hakai, a ubiquitin-ligase (E3) and subsequent protein internalization and ubiquitin-dependent degradation in mammalian cell lines (Figueroa et al. 2009; Fujita et al. 2002; Gong et al. 2010; Kaido et al. 2009; Mukherjee et al. 2012; Shen et al. 2008). A recent study reveals that Src42A controls E-cadherin residence time in Drosophila embryos during axis elongation (Chandran et al. 2023). Similarly, phosphorylation of β-catenin suppresses the cell–cell contacts for N-cadherin. In contrast, phosphorylation of p120-catenin promotes cell–cell contacts (Piedra et al. 2003; Pinho et al. 2011; Rhee et al. 2007).
O-glycosylation
E-cadherin is O-glycosylated within the secretory pathway in Golgi that targets the extracellular part and by cytoplasmic enzymes that target the intracellular tail. Different from phosphorylation, O-glycosylation at the cytoplasmic tail weakens p120 binding and cell–cell adhesion (Chihara and Nance 2012; Pinho et al. 2011; Zhu et al. 2001). O-glycosylation reduces its cell surface trafficking during apoptosis (Zhu et al. 2001). Human E-cadherin contains eight potential O-glycosylation sites for N-acetylglucosamine: threonine 285, 358, 470, 472, 509, 576, 578, 680, Uniprot P12830) (Fig. 4B). For mouse E-cadherin O-glycosylation for both serine and threonine residues has been reported (Thr 360, 472, 474, 511, 578, 580, 582, Ser 282 and 287, Uniprot P09803) (Larsen et al. 2017). The situation in Drosophila is unclear, but cell culture studies indicate that O-glycosylation serves a role in cell adhesion, even though no E-cadherin O-glycosylation sites have been reported (Schwientek et al. 2007; Zhang et al. 2008).
N-glycosylation
N-glycosylation is restricted to the ER and involves a stereotypic and conserved N-glycan that is transferred co-translationally to nascent proteins by an oligosaccharide transferase (OST) (Helenius and Aebi 2004). The stereotypic N-glycans may be modified in the Golgi. The consensus motif for N-glycosylation is Asn-X-Ser/Thr, where X can be any amino acid other than proline (Kornfeld and Kornfeld 1985; Pinho et al. 2011). Within the ER N-glycans are involved in folding and quality control, while they increase the hydrophilicity of the mature proteins. The majority of the E-cadherin N-glycosylation sites are conserved within closely related species (Pinho et al. 2011). For instance, three of the four potential N-glycosylation sites are conserved in both humans and canines (Pinho et al. 2011). Human E-cadherin has two sites in EC4 (Asn 558 and 570, Uniprot P12830) and two in EC5 (Asn 622 and 637, Uniprot P12830) (Fig. 4C) (Pinho et al. 2011). Canine E-cadherin shares the two sites in EC5 but has only one side in EC4. An additional site in EC5 was found in a carcinoma cell line (Pinho et al. 2011).
More sites have been found for Drosophila E-cadherin (Fig. 4C). Out of the predicted eleven sites (Asn 317, 466, 552, 766, 949, 983, 999, 1073, 1145, 1274, and 1290, Uniprot Q24298), nine (Asn 317, 466, 949, 983, 999, 1073, 1145, 1274, and 1290, Uniprot Q24298) have been verified by proteome-wide mass spectrometry (Zielinska et al. 2012). E-cadherin of C. elegans contains 18 potential sites (Asn 72, 243, 253, 339, 508, 658, 685, 715, 826, 1177, 1417, 1646, 1935, 2224, 2232, 2307, 2332, and 2623, Uniprot Q967F4) (Fan et al. 2005; Kaji et al. 2003).
In the Golgi, N-glycans are processed mainly by three glycosyltransferases, namely, N-acetylglucosaminyltransferase III (GnT-III), N-acetylglucosaminyltransferase V (GnT-V), and fructosyltransferase (FUT8). The GnT-III and GnT-V add bisecting GlcNAc (β1,4 GlcNAc) and β1,6 GlcNAc branched GlcNAc to the N-glycan stem. FUT8 is essential for α1,6 fucose N-glycan biosynthesis (Brockhausen et al. 1988; Narasimhan 1982; Pinho et al. 2011; Uozumi et al. 1996). The role of these enzymes and N-glycan processing for E-cadherin function is unclear. Whereas, GnT-III has been implicated in tumor suppression, GnT-V appears to facilitate tumor proliferation (Kimura et al. 2012; Yoshimura et al. 1995).
The literature is unclear concerning the functions of specific N-glycan residues. N-glycan may increase the general hydrophilicity of the protein or be involved in unspecific interactions with the extracellular matrix. Evidence for specific functions is sparse. Mutation of Asn 554 shows a protective role in human gastric cancer cell lines by affecting cellular localization, cis-dimer formation, and molecular stability (Carvalho et al. 2016). N-glycan removal at Asn 633 has been implicated in E-cadherin trafficking, folding, and quality control in the human MDA-MB-435 cell line; The Asn 633 mutant E-cadherin folded incorrectly and arrested in endoplasmic reticulum and then sequentially degraded by endoplasmic reticulum associated degradation (Zhao et al. 2008; Zhou et al. 2008).
Beside site-directed mutagenesis of specific sites, N-glycosylation can be affected by mutants of ER enzymes involved in N-glycan precursor synthesis. The Drosophila mutants wollknäuel (wol), garnystan (gny), xiantuan (xit) encode enzymes for addition of the last three glucosyl to the dolichol precursor (Jamal et al. 2009; Liwosz et al. 2006; Palovuori and Eskelinen 2000; Zhang et al. 2014). In all three mutants, E-cadherin is hypoglycosylated, as detected by an incomplete bandshift in comparison to glycosidase F treated extracts. These are lethal mutations for embryogenesis, in which germband extension and cell intercalation were delayed. The phenotypic consequences are morphological defects and undulated cell junctions during gastrulation in the xiantuan mutant, to which other N-glycosylated proteins may also contribute besides E-cadherin (Zhang et al. 2009; Zhao et al. 2008). In cultured CHO and carcinoma cells, hypo-N-glycosylated E-cadherin enhanced the cell adhesion and showed increased association with γ-catenin-p120 and Vinculin (Liwosz et al. 2006; Palovuori and Eskelinen 2000).
There is no understanding as to why O-glycosylation of E-cadherin reduces binding to p120-catenin (Chen et al. 2016a), whereas N-glycosylation promotes cell–cell contact (Jamal et al. 2009; Liwosz et al. 2006; Palovuori and Eskelinen 2000; Zhang et al. 2014).
Computational modelling of E-cadherin complexes
The complex, context-dependent and dynamic architecture, dynamics, and functions of the adhesion complexes presents a challenge when experimentally investigating E-cadherin–catenin complexes, especially during animal development and tissue morphogenesis. Computational modelling is a powerful and rapid approach for validation and prediction. In this section, we will highlight the impact of computational models on the field. Mathematical theories yield quantitative predictions and generate new questions that can be tested experimentally (Fig. 5) (Hale et al. 2015; Katsamba et al. 2009; Smyrek et al. 2019; Vanderleest et al. 2018). Modelling also allows us to look for general principles (National Academies of Sciences and Medicine 2022), so below we first consider general Cadherin dynamics before diving into E-cadherin specifics.
Modeling of cadherin dynamics aims to understand how, and under which conditions, macroscopic cell and tissue properties, such as adhesion, emerge from basic mechanics, Cadherin dynamics, and interactions, such as with the actin cortex. One approach is to use continuum mechanics, including Navier–Stokes or other fluid mechanics theory, such as the immersed boundary method (Dallon et al. 2009). Applications of these techniques have, for example, investigated the active role of the actin cortex for adhesive cells and cell adhesion in the context of cell sorting (Armstrong et al. 2006; Dallon et al. 2009; Murakawa and Togashi 2015). Hamiltonian dynamics was used to model catch bonds in the cadherin–catenin–actin complex, where forces induce conformational changes that lead to regulation of interaction strength between catenin and F-actin (Adhikari et al. 2018). A thermodynamic Markov model approach explains how generic self-stabilization through adhesion growth works under mechanical loads which is the type of stabilization that occurs in adhesive system with adaptor proteins, such as Vinculin and Talin (Braeutigam et al. 2022). Another common approach is to use kinetic reaction-rate models, for example, used to investigate interactions of E-cadherin, β-catenin and N-glycosylation (Vargas et al. 2016).
One specific property of E-cadherin, and cadherins in general, is their nature to form clusters. Theoretical considerations can predict power law distributions that match experimental measurements (Quang et al. 2013). In this model, E-cadherin clusters and actin filaments control the fission, while dynamin-dependent endocytosis is assumed to target only large clusters. A kinetic model showed that cadherin mediated adhesion and clustering can both inhibit and promote wnt signaling (Chen et al. 2014). More general models of Cadherin clustering use a similar kinetic approach (Chen et al. 2016b).Using stochastic Brownian dynamics, a more recent study suggests that E-cadherin binding probability increases with forces, and therefore, actomyosin generated tension determines cluster size (Chen et al. 2021). Despite these studies, no consensus exists on a quantitative, mechanistic understanding of Cadherin clustering, and consequently more combined experimental and theoretical studies are needed (Thompson et al. 2020; Yu et al. 2022).
Cadherins also play a role for mechanotransduction and signaling, including establishing planar cell polarity (PCP) (Leckband and De Rooij 2014; Levayer and Lecuit 2013). Computational models, using chemical reactions and diffusion, have shown that asymmetric intercellular complexes can lead to PCP (Le Garrec et al. 2006). In addition, other Cadherins, for example, interactions of the atypical Cadherins Fat and Dachsous have been modeled computationally and shown to lead to asymmetric localization (Hale et al. 2015; Jolly et al. 2014) as well as having an impact on cell morphology (Kumar et al. 2020). In the Drosophila eye, the dynamics of N-cadherin together with E-cadherin leads to asymmetric distribution of myosin and the control of cell shape as well as rearrangements, which has been modeled using energy functionals (Chan et al. 2017; Gemp et al. 2011). E-cadherin mediated mechanotransduction has also been directly linked to population growth in tissues using agent-based simulations (Walker et al. 2010).
In addition, computational models have been utilized for investigations regarding general Cadherin dynamics and properties, for example, solving a measurement problem for binding affinities (Wu et al. 2011), computational design of peptidomimetics of E-cadherin using molecular dynamics simulations (Civera et al. 2019; Doro et al. 2015), or sequencing (Hill et al. 2001). Another field where modeling of E-cadherin dynamics plays a role is Cancer research and models from there could also have an impact on tissue dynamics (Jolly et al. 2019; Ramis-Conde et al. 2008).
Several computational studies have been conducted that address E-cadherin dynamics only implicitly, for example, as a source for adhesion and, therefore, coarse grain the microscopic dynamics. Such models might describe E-cadherin explicitly as Hookean springs (Nestor-Bergmann et al. 2022), in terms of friction between cell interfaces (Metzcar et al. 2019) or address higher level descriptions, such as in vertex models, where the impact of microscopic molecular dynamics at the cell–cell interface is described by a line-tension parameter (Fletcher et al. 2014). In addition, active continuum models that describe the rheology of tissues include parameters that ultimately emerge from the microscopic dynamics (Jülicher et al. 2018). Further studies are still needed to better understand how macroscopic tissue properties emerge from the subcellular microscopic dynamics of E-cadherin and other molecules, as well as the collective behavior of cells.
Conclusion and perspectives
After decades of research, a good understanding emerges of the structure of the adherens junction in relation to its function in morphogenesis, but simultaneously also a growing awareness of the complexity of its structure and dynamics. Understanding the nanoscale architectures of the adherens junctions complexes, their interplay with cadherin–catenin-associated proteins, and their cytoskeleton, which are still poorly documented, are essential for a real understanding of these issues. For instance, studies are needed on: (1) the interplay and relation of trans and cis complexes of E-cadherin especially the function of unpaired cis complexes for adhesion; (2) the role of α-catenin as a dynamic, versatile and mechanoresponsive linker to the cortex; and (3) the interplay of structure with mechanical forces from the cortex for assembly and disassembly of adherens junctions, both in resilient and dynamic tissues during animal development and tissues morphogenesis.
Visualizing and comparing nanoscale architectures of the adherens junctions proteins (e.g., in different development stages during epithelial tissue morphogenesis or between species) will show possible variations of a central theme. Visualizing nanoscale architectures in mutants in comparison to phenotypes will reveal the mechanism underlying the signaling pathways and morphogenesis. The nanoscale architecture of cadherin-based cell adhesions from cultured mammalian cells has begun to be uncovered by super-resolution methods. However, applying super-resolution methods in the developmental tissues is a further goal. The rapid and effective gene editing techniques, such as CRISPR/Cas9 (Nyberg and Carthew 2022) and prime editing (Bosch and Perrimon 2022), allow labeling the AJ components with photoactivable and photo-switchable tags in the gene locus, which can help to visualize the endogenous proteins. The combination of super-resolution methods and gene editing techniques is the way to understand the nanoscale architectures of adherens junctions complexes in vivo.
Data availability
This article does not contain any original research data.
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This work was supported by the grants of the Deutsche Forschungsgemeinschaft (GR1945/10-1and GR1945/10-2 to JG)
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Zhang, N., Häring, M., Wolf, F. et al. Dynamics and functions of E-cadherin complexes in epithelial cell and tissue morphogenesis. Mar Life Sci Technol 5, 585–601 (2023). https://doi.org/10.1007/s42995-023-00206-w
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DOI: https://doi.org/10.1007/s42995-023-00206-w