Summary
Similarities in the composition of the extracellular matrix suggest that only some species of the unicellularChlamydomonas are closely related to the colonial and multicellular flagellated members of the family Volvocaceae. The cell walls from all of the algae in this volvocine group contain a crystalline layer. This lattice structure can be used as a phylogenetic marker to divideChlamydomonas species into distinct classes, only one of which includes the volvocacean algae. Similarly, not all species ofChlamydomonas are sensitive to each other's cell wall lytic enzymes, implying divergence of the enzyme's inner wall substrate. Interspecific reconstitution of the crystalline layer is possible betweenC. reinhardtii and the multicellularVolvox carteri, but not betweenC. reinhardtii andC. eugametos. The hydroxyproline-rich glycoproteins (HRGPs) which make up the crystalline layer in genera which have a similar crystal structure exhibit many homologies. Interestingly, the evolutionarily distant cell walls ofC. reinhardtii andC. eugametos also contain some HRGPs displaying a few morphological and amino acid sequence homologies. The morphological similarities between the flagellar agglutinins (HRGPs responsible for sexual recognition and adhesion during the mating reaction) and the cell wall HRGPs leads to the proposal of a superfamily from which novel HRGPs (designed for self-assembly/recognition) can constantly evolve. Just as variations in the wall HRGPs can lead to unique wall structures, new agglutinins facilitate sexual isolation of new species. Thus, the HRGPs could emerge as valuable phylogenetic markers.
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Abbreviations
- GLE:
-
gametic lytic enzyme
- GP:
-
glycoprotein
- HRGP:
-
hydroxyproline-rich glycoprotein
- SDS PAGE:
-
sodium dodecyl sulfate polyacrylamide gel electrophoresis
- VLE:
-
vegetative lytic enzyme
- VSP:
-
vegetative serine/proline-rich
- WP:
-
wall protein
- ZSP:
-
zygotic serine/proline-rich
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Woessner, J.P., Goodenough, U.W. Volvocine cell walls and their constituent glycoproteins: An evolutionary perspective. Protoplasma 181, 245–258 (1994). https://doi.org/10.1007/BF01666399
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DOI: https://doi.org/10.1007/BF01666399