Abstract
The freshwater zebra mussel, Dreissena polymorpha, is an invasive, biofouling species that adheres to a variety of substrates underwater, using a proteinaceous anchor called the byssus. The byssus consists of a number of threads with adhesive plaques at the tips. It contains the unusual amino acid 3, 4-dihydroxyphenylalanine (DOPA), which is believed to play an important role in adhesion, in addition to providing structural integrity to the byssus through cross-linking. Extensive DOPA cross-linking, however, renders the zebra mussel byssus highly resistant to protein extraction, and therefore limits byssal protein identification. We report here on the identification of seven novel byssal proteins in the insoluble byssal matrix following protein extraction from induced, freshly secreted byssal threads with minimal cross-linking. These proteins were identified by LC-MS/MS analysis of tryptic digests of the matrix proteins by spectrum matching against a zebra mussel cDNA library of genes unique to the mussel foot, the organ that secretes the byssus. All seven proteins were present in both the plaque and thread. Comparisons of the protein sequences revealed common features of zebra mussel byssal proteins, and several recurring sequence motifs. Although their sequences are unique, many of the proteins display similarities to marine mussel byssal proteins, as well as to adhesive and structural proteins from other species. The large expansion of the byssal proteome reported here represents an important step towards understanding zebra mussel adhesion.
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Acknowledgments
The authors gratefully acknowledge Trevor and Graham Gilbert for zebra mussel collection, and Paul Taylor and Li Zhang of the Advanced Protein Technology Centre (Hospital for Sick Children, Toronto, ON) for expert advice on LC-MS/MS analysis. This work was supported by a Discovery grant to E.D.S. from the National Sciences and Engineering Research Council (NSERC) of Canada and by an Ontario Graduate Scholarship to A.G.
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Gantayet, A., Rees, D.J. & Sone, E.D. Novel Proteins Identified in the Insoluble Byssal Matrix of the Freshwater Zebra Mussel. Mar Biotechnol 16, 144–155 (2014). https://doi.org/10.1007/s10126-013-9537-9
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DOI: https://doi.org/10.1007/s10126-013-9537-9