Isolation and amino acid sequence of bovine platelet factor 4

Archives of Biochemistry and Biophysics
R E CiaglowskiD A Walz

Abstract

Bovine platelet factor 4 was isolated by affinity chromatography using dextran sulfate Sepharose and purified by subsequent gel filtration. The complete amino acid sequence of this 88-residue, 9505-Da protein was determined by isolation and analysis of the overlapping peptides from tryptic and Staphylococcus aureus hydrolysates of reduced, carboxymethylated, and reductive methylated protein. Primary structure comparison was made between bovine platelet factor 4, human platelet factor 4, and human beta-thromboglobulin. The bovine platelet factor 4 amino-terminal region, which contains two unique phenylalanine residues, is extended by 15 residues relative to human platelet factor 4. The bovine carboxy-terminal region is extended by three residues relative to human platelet factor 4 and differed from beta-thromboglobulin in the absence of two additional terminal residues. Bovine platelet factor 4 shares sequence similarities proportionately with both human platelet factor 4 and beta-thromboglobulin. The sequences of the lysine-rich carboxy-terminal putative heparin binding domains are essentially identical for all three proteins. The heparin neutralizing potencies of bovine and human platelet factor 4 are similar: 40 USP units of ...Continue Reading

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