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Edited* by Andrew H. Knoll, Harvard University, Cambridge, MA, and approved October 31, 2012 (received for review July 9, 2012)
Abstract
Mollusca evolutionary success can be attributed partly to their efficiency to sustain and protect their soft body with an external biomineralized structure, the shell. Current knowledge of the protein set responsible for the formation of the shell microstructural polymorphism and unique properties remains largely patchy. In Pinctada margaritifera and Pinctada maxima, we identified 80 shell matrix proteins, among which 66 are entirely unique. This is the only description of the whole “biomineralization toolkit” of the matrices that, at least in part, is thought to regulate the formation of the prismatic and nacreous shell layers in the pearl oysters. We unambiguously demonstrate that prisms and nacre are assembled from very different protein repertoires. This suggests that these layers do not derive from each other.
Footnotes
↵1Present address: Unité Mixte de Recherche 7245 Centre National de la Recherche Scientifique Molécules de Communication et Adaptation des Micro-organismes, Muséum National d'Histoire Naturelle, 75005 Paris, France.
- ↵2To whom correspondence may be addressed. E-mail: bmarie{at}mnhn.fr or caroline.montagnani{at}ifremer.fr.
Author contributions: B.M., N.C.-L., F.M., Y.G., and C.M. designed research; B.M., C.J., A.T., I.Z.-C., C.B., and C.M. performed research; C.J. and A.T. contributed new reagents/analytic tools; B.M., C.J., A.T., I.Z.-C., D.P., F.M., and C.M. analyzed data; and B.M., C.J., F.M., Y.G., and C.M. wrote the paper.
The authors declare no conflict of interest.
↵*This Direct Submission article had a prearranged editor.
Data deposition: The sequences reported in this paper have been deposited in the GenBank database [accession nos. HE610373–HE610410 (P. margaritifera CDS)] and in the Swiss-Prot database [accession nos. P86947–P86969 (P. maxima proteins) and H2A0K6–H2A0P3 (P. margaritifera proteins)].
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1210552109/-/DCSupplemental.
Nacre versus prisms
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