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J. Biol. Chem., Vol. 263, Issue 30, 15462-15466, 10, 1988

Lambda-crystallin, a major rabbit lens protein, is related to hydroxyacyl-coenzyme A dehydrogenases

JW Mulders, W Hendriks, WM Blankesteijn, H Bloemendal and WW de Jong
Department of Biochemistry, University of Nijmegen, The Netherlands.

It has recently been discovered that several lens proteins in birds and lower vertebrates are active enzymes or enzyme-related proteins (Wistow, G., Mulders, J. W. M., and de Jong, W. W. (1987) Nature 326, 622-624; Wistow, G., and Piatigorsky, J. (1987) Science 236, 1554- 1556). We report here a novel lens protein, designated as lambda- crystallin, that occurs in rabbit and hare. It constitutes 7-8% of the total lens protein and has a subunit molecular mass of 35 kDa. Sequencing of cDNA clones encoding rabbit lambda-crystallin revealed 30% homology (at the amino acid sequence level) with L-3-hydroxyacyl- CoA dehydrogenase from pig mitochondria and 26% homology with enoyl-CoA hydratase-3-hydroxyacyl-CoA dehydrogenase from rat peroxisomes. Also, the presence of a putative beta-alpha-beta nucleotide-binding fold and low levels of non-lens expression are indicative of some enzymatic function for lambda-crystallin (or highly related sequences) in non- lens tissues. lambda-Crystallin thus represents the first example of an enzyme-related crystallin in lenses from mammalian species. The recruitment of enzymes as lens structural proteins apparently is an evolutionary strategy which has been applied independently in different lineages.
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