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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Human Protein Z.

Protein Z was purified from human plasma by a four-step procedure which included barium citrate adsorption, ammonium sulfate fractionation, DEAE-Sepharose chromatography, and blue agarose chromatography with a yield of 20%. It is a 62,000 mol wt protein with an extinction coefficient of 12. 0. The concentration of Protein Z in pooled, citrated plasma is 2.2 micrograms/ml and its half-life in patients starting warfarin anticoagulation therapy is estimated to be less than 2.5 d. The NH2-terminal sequence is Ala-Gly-Ser-Tyr-Leu-Leu-(Gla)-(Gla)-Leu-Phe-(Gla)-Gly-Asn-Leu. Neither Protein Z nor its cleavage products, which were obtained by treatment of Protein Z with thrombin or plasmin, incorporated [3H]diisopropyl fluorophosphate. The physiological function of Protein Z remains unknown.[1]


  1. Human Protein Z. Broze, G.J., Miletich, J.P. J. Clin. Invest. (1984) [Pubmed]
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