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. 1992 Jul 15;89(14):6242–6246. doi: 10.1073/pnas.89.14.6242

Purification and identification of bovine liver gamma-carboxylase.

K L Berkner 1, M Harbeck 1, S Lingenfelter 1, C Bailey 1, C M Sanders-Hinck 1, J W Suttie 1
PMCID: PMC49476  PMID: 1631116

Abstract

The microsomal gamma-carboxylase catalyzes modification of a limited set of glutamyl residues to gamma-carboxyglutamyl residues in a vitamin K-dependent reaction that also utilizes O2 and CO2. We report the purification to apparent homogeneity of the bovine liver microsomal carboxylase. Affinity chromatography exploiting the association of the carboxylase with prothrombin precursor and carboxylase binding to the propeptide sequence were combined with ion-exchange chromatography and fractionation using immobilized lectins. A 3.5 x 10(5)-fold purification was obtained, which is the highest purification, by a factor of 35, yet reported for this enzyme. A single 98-kDa protein is obtained from this isolation. Carboxylase activity is associated with this protein by two different criteria. Antibodies prepared against the carboxylase detected the 98-kDa protein when used in Western analysis. In addition, the single 98-kDa protein was shown to comigrate with activity when electrophoresed in a nondenaturing gel system. The availability of purified preparations of carboxylase will facilitate an increased understanding of the complex biochemical reaction carried out by this protein.

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Selected References

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