Lustrin A is an insoluble protein used in the production of a nacreous layer in bivalve molluscs. It contributes to the properties of the nacreous layer, imparting resistance to cracking and elasticity. This is accomplished by its structure; it consists of many spring-like units which can expand when the shell is under extensional pressure. Its structure is similar to that of proteins involved in silica deposition in diatoms. It consists of 1428 amino acid residues. Its molecular weight is estimated to be 142 kDa. Its terminus consists of a protease inhibitor, which contributes to its longevity in the molluscan shell matrix.
- Shen, X.; Belcher, A. M.; Hansma, P. K.; Stucky, G. D.; Morse, D. E. (1997). "Molecular Cloning and Characterization of Lustrin A, a Matrix Protein from Shell and Pearl Nacre of Haliotis rufescens". Journal of Biological Chemistry 272 (51): 32472. doi:10.1074/jbc.272.51.32472. PMID 9405458.
- Jackson, D.; McDougall, C.; Green, K.; Simpson, F.; Wörheide, G.; Degnan, B. (2006). "A rapidly evolving secretome builds and patterns a sea shell". BMC biology 4: 40. doi:10.1186/1741-7007-4-40. PMC 1676022. PMID 17121673.
- Marin, F.; Luquet, G. (2004). "Molluscan shell proteins". Comptes Rendus Palevol 3 (6–7): 469. doi:10.1016/j.crpv.2004.07.009.