Abstract
A full-length cDNA for bovine heart fatty-acid-binding protein (H-FABP) was cloned from a lambda gt11 cDNA library established from bovine heart muscle. The cDNA sequence shows an open reading frame coding for a protein with 133 amino acids. Colinearity with the amino acid sequences of four tryptic peptides was asserted. H-FABP isolated from bovine heart begins with an N-acetylated valine residue, however, as derived from analysis of the tryptic, amino-terminal-blocked peptide and the molecular mass of the peptide obtained via secondary-ion mass spectrometry. The molecular mass of the total protein is 14673 Da. Bovine H-FABP is 89% homologous to rat H-FABP and 97% homologous to the bovine mammary-derived growth-inhibition factor described recently by Böhmer et al. [J. Biol. Chem. 262, 15137-15143 (1987)]. Significant homologies were also found with bovine myelin protein P2 and murine adipocyte protein p422. Secondary-structure predictions were proposed for these proteins, based on computer analysis, which reveal striking similarities.
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