Proteomic analysis of the organic matrix of the abalone Haliotis asinina calcified shell

Springer Science and Business Media LLC - Tập 8 - Trang 1-11 - 2010
Benjamin Marie1, Arul Marie2, Daniel J Jackson3, Lionel Dubost2, Bernard M Degnan4, Christian Milet5, Frédéric Marin1
1UMR 5561 CNRS Biogéosciences, Université de Bourgogne, Dijon, France
2Département RDDM, Plateforme de Spectrométrie de Masse et de Protéomique/FRE3206 CNRS, Molécules de Communication et Adaptations des Micro-organismes, M.N.H.N, Paris, France
3Courant Research Center Geobiology, Georg-August-University of Göttingen, Göttingen, Germany
4School of Biological Sciences, University of Queensland, Queensland, Australia
5UMR 7208 BOREA, M.N.H.N., Paris, France

Tóm tắt

The formation of the molluscan shell is regulated to a large extent by a matrix of extracellular macromolecules that are secreted by the shell forming tissue, the mantle. This so called "calcifying matrix" is a complex mixture of proteins and glycoproteins that is assembled and occluded within the mineral phase during the calcification process. While the importance of the calcifying matrix to shell formation has long been appreciated, most of its protein components remain uncharacterised. Recent expressed sequence tag (EST) investigations of the mantle tissue from the tropical abalone (Haliotis asinina) provide an opportunity to further characterise the proteins in the shell by a proteomic approach. In this study, we have identified a total of 14 proteins from distinct calcified layers of the shell. Only two of these proteins have been previously characterised from abalone shells. Among the novel proteins are several glutamine- and methionine-rich motifs and hydrophobic glycine-, alanine- and acidic aspartate-rich domains. In addition, two of the new proteins contained Kunitz-like and WAP (whey acidic protein) protease inhibitor domains. This is one of the first comprehensive proteomic study of a molluscan shell, and should provide a platform for further characterization of matrix protein functions and interactions.

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