Abstract
We purified a new EF-hand type calcium binding protein from chicken gizzard smooth muscle, tentatively named calgizzarin (Todoroki, H., et al. J. Biol. Chem. (1991) in press. Based on the internal peptide sequence of calgizzarin, we isolated and sequenced a cDNA clone coding for calgizzarin from a rabbit lung cDNA library. This clone (pCALG) has 309 nucleotides of open reading frame including termination codon TGA, 621 nucleotides of the 5' leader and 186 nucleotides of the 3' noncoding region. The polypeptides deduced from the open reading frame were consisted of 102 amino acid residues with a molecular weight of 11,429. Computer aided homology analysis revealed that calgizzarin exhibits a 43.2% homology to S-100 alpha, 38.6% to S-100 beta and 40.0% to annexin II light chain, p10. By Northern blot analysis, with pCALG, a band of 1.1 kbp was detected in rabbit lung, suggesting pCALG contains nearly full length of mRNA.
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