Abstract
Amyloidogenesis is the inherent ability of proteins to change their conformation from native state to cross β-sheet rich fibrillar structures called amyloids which result in a wide range of diseases like Parkinson's disease, Alzheimer’s disease, Finnish familial amyloidosis, ATTR amyloidosis, British and Danish dementia, etc. COVID-19, on the other hand is seen to have many similarities in symptoms with other amyloidogenic diseases and the overlap of these morbidities and symptoms led to the proposition whether SARS-CoV-2 proteins are undergoing amyloidogenesis and whether it is resulting in or aggravating amyloidogenesis of any human host protein. Thus the SARS-CoV-2 proteins in infected cells, i.e., Spike (S) protein, Nucleocapsid (N) protein, and Envelope (E) protein were tested via different machinery and amyloidogenesis in them were proven. In this review, we will analyze the pathway of amyloid formation in S-protein, N-protein, E-protein along with the effect that SARS-CoV-2 is creating on various host proteins leading to the unexpected onset of many morbidities like COVID-induced Acute Respiratory Distress Syndrome (ARDS), Parkinsonism in young COVID patients, formation of fibrin microthrombi in heart, etc., and their future implications.
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Introduction
Protein folding and binding provide the basis for life on earth. The native 3D structure of a protein is necessary for its biological function (Perozzo et al. 2004). Among many protein folding models such as diffusion-collision, nucleation-condensation, jigsaw puzzle, hydrophobic collapse and stoichiometry models, the “folding funnel” model based on the free energy landscape theory has now been most widely accepted (Shu-Qun Liu et al. 2012). The natural tendency of polypeptide chains to get folded into its unique native structure inside a cell is guided by many machinery like the proteasomes, chaperones, protein disulfide isomerases, ubiquitins, prolyl peptide isomerase, etc., which reserve the properly folded proteins and degrade the misfolded ones. Though there are a lot of corrective machineries present, yet proteins have an inherent tendency to undergo transition to self-assembled aggregates from their native soluble state. Of the various types of protein aggregates, “amyloids” are a type of stable, fibrillar, ordered protein aggregates which are possess cross β sheet-rich structures and the process of amyloid formation is called amyloidogenesis (Dobson 1999; Clark et al. 1981). Till date, about 37 human proteins have been seen to form amyloids and most of them are related to several degenerative disorders like Parkinson’s disease, Alzheimer’s disease, type II diabetes, etc., (Marzban et al. 2003; Ghetti et al. 1996; Ghiso and Frangione 2002; Petrou et al. 2015). Apart from pathogenicity, amyloids have been also found to be functional in many aspects, as structural components in bacteria and viruses, as biochemical regulators functioning as hemostatic agent in human beings, as scaffolds, molecular chaperones as well as in sexual reproduction (Sarkar 2020).
Now, coming to the current scenario, the world has been almost put to a standstill in the post-pandemic era as we are still recovering from the damage it has caused us, be it physically, mentally or economically. With the intensive research going on SARS-CoV-2, scientists noticed similarities in symptoms and morbidities between COVID-19 and amyloid regulated diseases, which led to the hypothetical link of amyloidogenesis in coronavirus. Supported by the prior proof about interactions between amyloids present in viruses and their respective human host, various research work was conducted which brought forward the link between COVID-19 and amyloid regulated diseases like Parkinson’s, Alzheimer's, ATTR (amyloidogenesis of transthyretin), etc., (Tayeb-Fligelman et al. 2021; Michiels et al. 2021; Munch et al. 2007; Dimitrov et al. 1993). This review article presents a summary of almost all the current work done on amyloidogenesis in coronavirus, and how that may aggravate amyloidosis in future.
Amyloidogenesis in SARS-CoV-2 proteins
Similarities in morbidities between COVID-19 and amyloidogenic cardiopathy and neuropathy like heart failure, blood clotting, CNS disorders, peripheral neuropathy, etc., and unusual onset of what is known as “Parkinsonism” which include conditions related to abnormalities in movement as seen in Parkinson's Disease, post-COVID recovery in young patients led to the hypothesis that maybe different proteins of SARS-CoV-2 are amyloidogenic, based on the prior proof of amyloidogenesis in viral proteins that infect human systems like the liver, kidney, immune cells and even the CNS (Merello et al. 2021; Cohen et al. 2020; Lee et al. 2021).
SARS-CoV, the coronavirus responsible for the outbreak of SARS in 2003 has been experimentally proven to contain amyloidogenic proteins and since the proteome of SARS-CoV and SARS-CoV-2 have many similarities in biological structure and function, it was proposed that SARS-CoV-2 also contains amyloidogenic proteins which can give rise to neurodegenerative complications (Rangan et al. 2020; Galkin 2021). In a study, open reading frames (ORFs) of SARS-CoV-2 proteome were studied using a computational tool named ZIPPER for screening amyloidogenic sequences which led to the result two sub-sequences from ORF6 and ORF10 were aggregation prone (Charnley et al. 2022). The main structural and functional proteins including the non-structural proteins (NSPs) of SARS-CoV and SARS-CoV-2 was computationally screened using four softwares namely MetAmyl, FISH Amyloid, AGGRESCAN, and FoldAmyloid to find out aggregation prone regions (APRs) in both the proteomes. In the proteome of SARS-CoV, the membrane protein or M-protein, C-terminal end and transmembrane domain (TMD) of envelope protein or E-protein, ORF8b have been proven to be amyloidogenic (Ghosh et al. 2015; Lee et al. 2005). In SARS-CoV-2, membrane protein (M), envelope protein (E), among the structural proteins along with the accessory proteins were found to be more amyloidogenic than nucleocapsid protein (N) and spike protein (S). Out of the 16 non-structural proteins (NSPs) present in the genome of SARS-CoV-2, NSP4 and NSP6 were found to be highly amyloidogenic. Besides, mean predicted percentage amyloidogenic propensity study revealed that accessory proteins of SARS-CoV-2 were more aggregation prone than that of SARS-CoV (Bhardwaj et al. 2021).
Spike protein (S-protein) is the primary SARS-CoV-2 contact protein between the host and the virus which helps in virus docking and host-entry (Nyström and Hammarström 2021). Nucleocapsid protein (N-protein) on the other hand is more abundant, relatively more stable and conserved than the S-protein gene (Cubuk et al. 2021). Envelope protein (E protein), though being the smallest, interacts with other proteins and helps in maintaining the viral shape, release and also promotes cellular apoptosis (Alsaadi et al. 2020; Chen et al. 2009). All these proteins were tested through various experiments to evaluate their amyloidogenic propensity, and the results are demonstrated in Fig. 1. It was furthermore found out through computational study that the above mentioned proteins in SARS-CoV-2 have more aggregation tendency than those of SARS-CoV-2 (Bhardwaj et al. 2021).
SARS-CoV-2 Spike Protein Amyloidogenesis:
Complete S-protein sequence (ID: P0DTC2) was subjected to invitro fibril formation and seven amyloidogenic sequences were deciphered out of several 20 amino acid long sequences, using the WALTZ algorithm, which were named according to the start position of the S‐protein; S191, S-259, S-362, S-532, S-599, S-689, S-1165, as shown in Table 1. Out of these, S-362 was seen to not have the cross β-sheet conformation under cryo-EM. In vitro amyloidogenesis study of lyophilized peptide using ThT formation kinetics, Congo-Red birefringence (CR) and transmission electron microscopy (TEM) showed S-191, S-532 and S-1165 to fulfill all the necessary amyloid criteria, out of which S-191 showed the most ordered fibrils (Zhang et al. 2018; Maurer-Stroh et al. 2010; Hamodrakas et al. 2007; Galzitskaya et al. 2006). Furthermore, sigmoidal kinetics curve also predicted dominance of S-191 fibrils. Thus, out of all the assumed amyloidogenic sequences, spike peptide S-191 showed most potent amyloidogenicity fulfilling almost all the authenticity criteria, proving the existence of amyloidogenesis in S-protein of SARS-CoV-2. Owing to the high stability (Tm > 50) and complex fold structure, SARS-CoV-2 S-protein is not spontaneous to amyloid formation (Upadhyay et al. 2021). Since endoproteolysis of amyloid prone proteins or even full length proteins leads to the molecular initiation of many amyloidogenic diseases like Alzheimer's, Finnish familial amyloidosis, British and Danish dementia, ATTR amyloidosis, etc., it was considered as a hypothetical mechanism to start with, which was further experimentally investigated (Sipe 2008). SARS-CoV-2 S-protein is proteolysed during infection and also during inflammation by host furin-like enzymes and by release of enzymes like neutrophil esterase (abbreviated as NE, a serine protease that causes obstructive lung diseases such as COPD, cystic fibrosis and alpha‐1‐antitrypsin deficiency) by the neutrophils extracellularly, which are recruited by the host immune system to the bronchoalveolar cavity of patients affected with various respiratory viruses, including SARS‐CoV‐2 (Peacock et al. 2021; Johansson and Kirsebom 2021; Strnad et al. 2020). At first, in-silico proteolytic cleavage of full length S-protein sequence by NE was done using Expasy Peptide cutter and one of the peptides from the results, Spike 193–212 matched with S-191, only with a frame shift by 2 amino acids. This proved the hypothetical mechanism and thus was subjected to further in vitro testing by S-protein digestion with NE. Among all the peptide segments formed segment 193‐202 (FKNIDGYFKI, included in Spike191) was highly abundant after 6 h of incubation, which made it amyloidogenically important (Nyström and Hammarström 2021).
Acceleration of amyloidogenesis due to SARS-CoV-2 N-Protein:
Reports of unexpected Parkinsonism in young patients after recovering from SARS-CoV-2 infection raised the question whether any SARS-CoV-2 protein is leading to accelerated amyloidogenesis of α-synuclein (αS) protein that leads to the formation of Parkinson’s Disease (PD) (Espay and Henderson 2011; Bantle et al. 2019; Fishman et al. 1985; Merello et al. 2021; Cohen et al. 2020). N-protein being more stable and conserved, was chosen for investigation of the above-mentioned hypothesis. As shown in Fig. 2, ThT assay of αS peptide in the presence of N-protein resulted in reduction in aggregation lag time to less than 24 h, which decreased with the increase in N-protein concentration. This clearly indicated that the presence of N-protein was considerably accelerating the amyloidogenesis in αS-protein. Since, at a near neutral pH of 7.4, N-protein is positively charged (+ 24e) whereas αS is negatively charged (-9e), thus, electrostatic attraction is thought to be the primary intermolecular interactive force (Semerdzhiev et al. 2022; Taquet et al. 2021). Further in another study, microscale thermophoresis (MST) and fluorescence correlation spectroscopy (FCS) assay was performed on fluorescently labeled αS and with increasing concentration of the N-protein which predicted the presence of about 3 to 4 αS proteins in an αS/N-protein complex along with the indication of cooperative binding (Chatterjee et al. 2021).
While the S-protein of SARS-CoV-2 is responsible for host entry, the N-protein is predominantly found in the cytoplasm post-infection, of the order of about 500 nM (Chang et al. 2004; Bar-On et al. 2020; Timani et al. 2005). Thus, to investigate the effect of N-protein presence along with αS in the cellular environment, microinjection of appropriate amount of N-protein as present during infection was done in SH-SY5Y neuronal cell model, which express αS peptide and extensively used in PD research. Now, the endogenously disordered αS is bound to vesicles, which take part in membrane remodeling and in membrane trafficking processes having an α-helical conformation that can be differentiated from the unbound ones (Fakhree et al. 2016; Kaur and Lee 2020; Burré et al. 2014; Lautenschläger et al. 2017). Förster resonance energy transfer (FRET) probes were used in vitro to detect these conformational changes and locate such vesicle bound αS in cells. The FRET results showed that compared to the control where only FRET-labeled αS peptides were present, high FRET signals were less indicating that the presence of N-protein decelerates the endogenous αS proteostasis, ultimately reducing the number of vesicle-bound αS (Fakhree et al. 2018; Nemani et al. 2010). The control probe was prepared by attaching the FRET-probe with the N-terminal domain of αS peptide and it did not show any change in FRET readings, indicating that αS is likely to bind to the C-terminal region of N-protein. These studies proved the involvement of SARS-CoV-2 N-protein in amyloidogenesis of αS peptide through direct molecular contact that leads to proteostasis of the peptide and hampers its normal cellular functioning, thereby inducing Parkinsonism in many unusual cases, post infection.
Amyloidogenesis in SARS-CoV-2 E-protein:
SARS-CoV-2 E protein has been said to have role imparting virulence and has been proved to be responsible for transferring the other corona proteins to the Golgi complex for further infective modifications. A β-sheet conformatory region, 55-TVYVYSRVK-63 (TK9), which contains residues that have similarities with many short length amyloid proteins like amyloid-β, is considered to be critical for this function (Li et al. 2014; Halverson et al. 1990). This led to the hypothesis that maybe TK9 is amyloidogenic which may result in enhanced virulence of SARS-CoV-2 strain. Now, in short length amyloidogenic peptides self-assembly has been seen as a potential mechanism of protein misfolding and thus the self-assembling potential of the nine-residue peptide sequence TK9 was tested (Lu et al. 2003). Dynamic light scattering (DLS), circular dichroism (CD) and ThT assay studies showed that proper β-sheet type spectral signature was seen after about 15 days of incubation, henceforth indicative of the fact that amyloidogenic propensity increases with time in E-protein (Ghosh et al. 2015; Lawrence et al. 1995). Another study determined that the probable mechanism behind the self-assembling nature of TK9 is that due to increase in hydrophobic and aromatic residues in the environment, hydrophobic bonding as well as π − π interactions increases between the amyloid aggregation-prone motifs of peptidemers which result in steady transition to cross β-sheet nature by self-assembly, resulting in the formation of amyloids. Moreover these motifs can easily bind with other amyloid prone proteins in the host and result in acceleration of amyloidogenesis of those proteins leading to some peculiar morbidity (Lopez de la Paz and Serrano 2004; Minor and Kim 1994).
Amyloidogenesis in human-host proteins as a result of COVID-19
COVID-19, though being a respiratory system infection, has a plethora of other symptoms which spread almost to every other system in the body ranging from neurological/sensory problems like loss of taste and smell, fatigue; gastrointestinal problems like nausea, diarrhea; urinary problems like kidney failure, septic shock; microcirculatory problems like microangiopathy besides the severe respiratory complications like pneumonia, chest congestion, etc. Along with this, immunogenic activation leading to cytokine storm has a critical effect on weak organs of our body leading to multi-organ failure and even death (Zeng et al. 2020; Connors and Levy 2020; Coperchini et al. 2020; Rodriguez-Morales et al. 2020). There are already many existing amyloidogenic diseases in our body which include both neuropathy and cardiomyopathy and based on the previous findings of amyloidogenicity in SARS-CoV-2 protein and proof of coronavirus proteins accelerating the amyloidogenesis of neurodegenerative protein αS responsible for Parkinson’s Disease (discussed above), it was thought of whether SARS-CoV-2 proteins can affect or aggravate the amyloidogenesis of the other pre-existing amyloidogenic proteins in our body or not (Li et al. 2021). Studies were conducted which yielded many positive results, some of which are discussed in Fig. 3.
Amyloidogenesis in COVID-induced ARDS
Acute Respiratory Distress Syndrome (ARDS) is the condition in which fluid gets filled in the air sacs of the lungs, called alveoli, depriving organs of oxygen which is detected in about 20–67% of hospital-admitted COVID patients (Grasselli et al. 2020; Said et al. 2013). Owing to the fact that lung inflammation in many cases can lead to pulmonary as well as non-pulmonary amyloidosis like systemic amyloidosis in pulmonary tuberculosis patients due to SP-C peptide amyloidogenesis. Besides, other conditions like cystic fibrosis, pulmonary sarcoidosis, rheumatic diseases, etc., are prominently related with amyloid A (AA) amyloidosis (Gustafsson et al. 1999; Brunger et al. 2020; Obici and Merlini 2012). All these prior findings led to the assumption of a probable link of amyloidogenesis as the molecular mechanism behind COVID-19 induced ARDS. Though not yet proved, there are many hypothetical pathways that are thought to lead to amyloidogenesis in COVID-induced ARDS, as depicted in Fig. 4. These include over-expression of the enzyme elastase in the plasma which may lead to excessive digestion of elastin proteins in the cell, that may result in formation of amyloidogenic peptides gradually post-COVID infection, overexpression of serum amyloid A (SAA) due to pulmonary inflammation during COVID and subsequent overexpression of matrix metalloprotease enzymes like MMP-3 which can cleave SAA and result in production of amyloidogenic proteins which may cause non-pulmonary amyloidosis, secondary infection post-COVID owing to compromised immunity by pathogens like Klebsiella pneumoniae and Escherichia coli which may lead to the release of lipopolysaccharide-like factors which may induce ARDS due to AA (amyloid-A) amyloidosis, that can severely affect the renal functions in our body (Zahid et al. 2020; Lundmark et al. 2002; Bochicchio et al. 2013). Apart from these reduced redox-homeostasis in lungs post-COVID due to increase in oxidative stress in the pulmonary environment that pertubes the metastable lung surfactant proteins like SP-C resulting in their amyloidogenesis, further signifying the chances of amyloidosis in ARDS patients (Dluhy et al. 2003; Johansson 2001). Due to the above mentioned pathways, the initial amyloids formed may not have such adverse effects in our body but can act as amyloid-enhancing factors which may cause severe amyloidosis in future and result in onset of various amyloidogenic diseases.
Amyloidogenic microclot formation
Hypercoagulation or microclot formation in the lungs of SARS-CoV-2 infected patients is a common pathology. Since, SARS-CoV-2 achieves host-entry by docking its S-protein with the ACE-2 receptor of the host, the role of both the participants were studied in microclot formation in patients. Angiotensin helps in anti-thrombosis of the platelet, thereby decreasing clot formation in blood, which is catalyzed by ACE-2 enzyme. Due to COVID, downregulation of ACE-2 receptors is noticed which results in microthrombosis of blood in the pulmonary environment (Fraga-Silva et al. 2008; Verdecchia et al. 2020). Furthermore, it was seen that, patients with pre-existing cardiac amyloidosis had an increased rate of microclot formation in their lungs when compared with the ones without cardiac amyloidosis; suggesting that these set of patients are coming under high-risk radar of added morbidities post-COVID infection (Menter et al. 2020; Hanley et al. 2020; Ng et al. 2016). Now, while analyzing the role of S-protein, it must be known beforehand that SARS-CoV-2 can shed the spike protein cover which can circulate to different systems of our body, including the urinary and nervous system, crossing the blood–brain barrier (George et al. 2021; Rhea et al. 2021; Bleu et al. 2015). Healthy platelet-poor plasma (PPP) was tested with and without the addition of S-protein; mass spectrometry, SEM, fluorescence microscopy analysis showed the emergence of dense amyloid structures, resistant to trypsin digestion leading to the formation of microclots, impairing steady blood flow (Grobbelaar et al. 2021; Erickson and Banks 2018). Thus, it was seen that presence of prior cardiac amyloidosis accelerated microclot formation due to the onset of COVID-19 as well as the interaction of S-protein with platelets resulting in amyloid-prone aggregate formation in the pulmonary vasculature post-infection.
Amyloidogenesis in serum amyloid-A protein
Serum amyloid A is such a protein which leads to deposition of amyloid fibrils during the course of many inflammatory diseases like cancer leading to the inflammation, hypercoagulation/thrombosis and also multi-organ damage in many cases. In COVID-19 patients, SAA related amyloidosis like kidney failure and thrombosis is quite common which led to the hypothesis of any direct interaction between SARS-CoV-2 protein and SAA, that may cause long-term risk in COVID survivors in near future like multisystem inflammatory syndrome in children as well as adults (MIS-C and MIS-A, respectively) (Hanff et al. 2020; Fabrizi et al. 2020; Morris et al. 2020; Yeung et al. 2016). Molecular simulation studies proved the effect of 9-residue segment known as SK9 of the E-protein leads to the increased amyloidogenic propensity of SAA. This is guided by mainly three mechanisms: firstly, SK9 binding with whole SAA protein can decrease the stability of native SAA hexamer which results in formation of amyloidogenic monomers; secondly, SK9 can bind with the fragmented SAA and result in formation of amyloid-prone form of SAA; finally, SK9 can stabilize SAA fibrils making them more aggregation prone and resistant to proteolysis (Jana et al. 2021; Zhou et al. 2014; Woo et al. 2007).
Discussion and future prospective
COVID-19, though being primarily a pulmonary viral infection, has several other pathogenesis linked with it like acute respiratory distress syndrome (ARDS) that can result in systemic AA amyloidosis, cytokine storm, heart damage, kidney damage, neurological problems, disturbances in blood flow, etc., (Huang et al. 2021; Lipcsey et al. 2021; Gao et al. 2021; Sinha and Thakur 2021; Sen et al. 2016). Apart from this, hypercoagulation of blood and impaired fibrinolysis have been reported in COVID-19 recovered patients, proposing a link of amyloidogenesis in different proteins of SARS-CoV-2 resulting in amyloidogenic disease-specific symptoms and manifestations in COVID-19 (Grobbelaar et al. 2021). The two most abundant proteins in COVID-19 infected human cells are the N-protein and S-protein of SARS-CoV-2. S-proteins present the primary contact protein between the host and the virus along with being the host-entry point, whereas N-protein is more conserved and stable in the individuals affected than S-protein. Besides, both the proteins have been extensively used as the main antigen for various vaccine productions against SARS-CoV-2.
S-protein amyloidogenesis was tested, and it was proven that endoproteolysis induced by immune-responsive proteases like neutrophil esterase (NE) can nick S-protein at multiple sites and promote amyloid fibril formations; segment 192–212 being the most accurate and pathologically important. Other proteases can also result in such fragmentation followed by amyloidogenesis, but what was proved with NE digestion of S-protein provides the basic mechanism of what might be the case for other enzymes as well. Segment 192–212 in S-protein is that potent segment which is highly amyloidogenic and may result in amyloidosis in the near future after COVID-infection and also after vaccination (Laudicella et al. 2021; de Jong et al. 2006). Next, both S-protein and N-protein were tested against αS protein, amyloidosis of which results in development of Parkinson's Disease (PD), to develop a molecular link between COVID-19 and the onset of Parkinsonism, especially in younger patients post-recovery. S-protein showed no role in enhancement of αS aggregation but N-protein, on the other hand, not only enhanced the aggregation but also resulted in production of more homogenized and stable fibrillar morphology, disturbing the endogenous αS proteastasis in the cell which hampers normal cellular functions and causes Parkinsonism. Therefore, overlapping mechanisms between different pathways of amyloidogenesis in cell and that of ARDS induced cellular machinery, led to the hypothesis of a link between COVID-induced ARDS and amyloidogenesis. Though not molecularly proven, several pathways are present which can lead to amyloidogenesis of different critical proteins like systemic AA, lung surfactant proteins like SP-C, elastin, that may initially cause minute amyloidosis, but in near future can result in production of amyloid-enhancing factors causing severe amyloidogenesis in critical proteins like Transthyretin (TTR) (Thomas et al. 2021; Smith et al. 1979; Koike and Katsuno 2020; Driggin et al. 2020).
At present, worldwide 97 COVID vaccines are in the pipeline, 37 vaccines have been approved/authorized and being used all over the world (Craven 2022; Jeyanathan et al. 2020; Flaxman et al. 2020). Most of the authorized and developing vaccines use either S-protein or N-protein of SARS-CoV-2 as the main antigen, which means apart from the viral infection, we are being medically incorporated with the amyloidogenic viral proteins in the ever-increasing doses of vaccination. Thus, it is of utmost importance to study the side-effects of vaccination using the amyloidogenic viral proteins, as being done in the case of SARS-CoV-2 to prevent the onset of amyloidosis related cardiopathy and neuropathy including neurodegenerative diseases like Alzheimer's disease and Parkinson's disease; seeds of which are being borne in our system from a young age due to COVID-related amyloidogenesis. Summarized data on the amyloidogenic proteins of COVID-19, their mechanism of action and future implications is provided on Table 2.
Conclusion
COVID-19 has been the greatest bane to our existence in recent times and teamed up with the age-old machinery of amyloidogenesis, it is resulting in aggravated complications and morbidities in critical amyloidogenic diseases like ATTR (transthyretin amyloidosis). S-protein and N-protein amyloidogenesis, resulting due to endoproteolysis and proteastasis of cellular αS protein, respectively, may lead to aggregation and amyloid formation that can cause neurodegenerative and other amyloidogenic cardiac and neural complications in future. Along with this, the side effects of COVID-19 vaccination using these very proteins as their main antigen needs to be studied properly to prevent the onset of amyloidogenesis related pathological conditions in individuals post SARS-CoV-2 infection, and aggravation of common morbidities between COVID-19 and critical amyloidogenic diseases like ATTR.
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Seth, P., Sarkar, N. A comprehensive mini-review on amyloidogenesis of different SARS-CoV-2 proteins and its effect on amyloid formation in various host proteins. 3 Biotech 12, 322 (2022). https://doi.org/10.1007/s13205-022-03390-1
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DOI: https://doi.org/10.1007/s13205-022-03390-1