title: Novel proteins from the calcifying shell matrix of the Pacific oyster Crassostrea gigas.
abstract: The shell of the Pacific oyster Crassostrea gigas is composed of more than 99% CaCO₃ and of around 0.5% of occluded organic matrix. According to classical views, this matrix is supposed to regulate the shell mineral deposition. In this study, we developed one of the first proteomic approaches applied to mollusk shell in order to characterise the calcifying matrix proteins. The insoluble organic matrix, purified after demineralisation of the shell powder, was digested with trypsin enzyme, and separated on nano-LC, prior to nanospray quadrupole/time-of-flight analysis. MS/MS spectra were searched against the above 220,000 EST sequences available in the public database for Crassostrea. Using this approach, we were able to identify partial or full-length sequence transcripts that encode eight novel shell matrix proteins.
authors.affiliation: UMR 5561 CNRS Biogéosciences, Université de Bourgogne, 6 Bd. Gabriel, Dijon 21000, France. benjamin.marie@u-bourgogne.fr
authors.forename: Benjamin
authors.initials: B
authors.lastname: Marie
authors.forename: Isabelle
authors.initials: I
authors.lastname: Zanella-Cléon
authors.forename: Nathalie
authors.initials: N
authors.lastname: Guichard
authors.forename: Michel
authors.initials: M
authors.lastname: Becchi
authors.forename: Frédéric
authors.initials: F
authors.lastname: Marin
mesh_terms: D060105:Animal Shells / Q000737:chemistry*; D000818:Animals; D002853:Chromatography, Liquid; D019295:Computational Biology; D049896:Crassostrea / Q000737:chemistry*; D020224:Expressed Sequence Tags; D015723:Gene Library; D008855:Microscopy, Electron, Scanning; D011506:Proteins / Q000032:analysis*; D040901:Proteomics / Q000379:methods; D053719:Tandem Mass Spectrometry; D014357:Trypsin
chemical_list: D011506:Proteins; D014357:Trypsin