COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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Characterization of protein S, a gamma-carboxyglutamic acid containing protein from bovine and human plasma.

Biochemistry 1979 March 7
Protein S is a vitamin K dependent protein of unknown function, which is present in mammalian plasma. It was isolated from bovine plasma by barium citrate adsorption and elution, ammonium sulfate fractionation, and column chromatography on DEAE-Sephadex, heparin-agarose, and polyhomoarginine-Sepharose. Bovine Protein S (Mr 64,200) is a single-chain glycoprotein with an amino-terminal sequence of Ala-Asn-Thr-Leu-Leu-. It contains 7.0% carbohydrate and 10 residues of gamma-carboxyglutamic acid per mol of protein. Human Protein S (Mr 69,000) is also a single-chain glycoprotein with an amino-terminal sequence of Ala-Asn-Ser-Leu-Leu-. It contains 7.8% carbohydrate and 10 residues of gamma-carboxyglutamic acid per mol of protein. These results indicate that Protein S from bovine or human plasma shows many similarities to the other vitamin K dependent proteins present in plasma.

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