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. 1974 Jul;141(1):79–84. doi: 10.1042/bj1410079

The calcium-induced dissociation of human plasma clotting Factor XIII

Rodney D Cooke 1,*, J John Holbrook 1
PMCID: PMC1168051  PMID: 4477004

Abstract

1. Large quantities of human Factor XIII were prepared from ethanol precipitates of outdated human plasma. 2. Material homogeneous after chromatography on DEAE-cellulose was further resolved into two proteins, A and B, after filtration on Sepharose 6B. 3. Protein A has a molecular weight of 350000 and a subunit structure a2b2 and is activated by thrombin and calcium. Protein B is inactive and probably has a subunit structure b2. 4. Calcium causes protein A, after thrombin cleavage, to fragment to give protein B and a protein, containing only a′ subunits, which is catalytically active. The latter protein slowly forms a misty precipitate which is still active and not cross-linked covalently. This confirms the suggestion of Schwartz et al. (1971) that catalytic activity is only associated with a′ subunits. 5. Iodoacetate, which inhibits the enzyme, does not inhibit dissociation and aggregation of protein A. 6. The existence of two proteins and the fragmentation are possible explanations for the wide range of molecular weights given for Factor XIII in the literature.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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