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Human 27-kDa calbindin complementary DNA sequence. Evolutionary and functional implications.

M Parmentier·D E Lawson·G Vassart
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Abstract

Human 27-kDa calbindin cDNA clones were selected by antibody screening from lambda gt11 brain libraries. The sequence revealed an open reading frame coding for a protein of 261 amino acids, containing four active calcium-binding domains, and two modified domains that had presumably lost their calcium-binding capability. Comparison with chick and bovine calbindins showed that the protein was highly conserved in evolution (evolutionary rate: 0.3 x 10(-9) amino acid-1 year-1) and that active and inactive domains were equally conserved. From the data we postulate that calbindin has an important physiological function involving protein--protein interactions. Comparison of calcium-binding domains from various proteins suggested that all members of the troponin C superfamily derive from a common two-domained ancestor, but that duplications leading to calbindin and to the four-domained calcium-binding proteins took place independently on different branches of the evolutionary tree. Preliminary data showed that another calcium-binding protein, homologous to calbindin, is present in the brain and encoded by a different gene.

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Amino Acid SequenceAnimalsAntibodiesBase SequenceBiological EvolutionCattleChickensCloning, MolecularDNAHumansMolecular Sequence DataS100 Calcium Binding Protein GSequence Homology, Nucleic AcidTroponinTroponin CComparative StudyJournal ArticleResearch Support, Non-U.S. Gov't

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M Parmentier, D E Lawson, G Vassart. 1987-12-30. Human 27-kDa calbindin complementary DNA sequence. Evolutionary and functional implications.. https://doi.org/10.1111/j.1432-1033.1987.tb13688.x

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