Abstract
The later stages of the blood coagulation cascade are characterized by the presence of vitamin K-dependent proteins and their involvement in membrane-bound, multi-protein converting complexes with an essential requirement for calcium ions. Specific interactions between zymogens and activating enzymes have not yet been identified. Here we describe a crystallographic study of prothrombin fragment 1 (residues 1–156 of prothrombin) which indicates that vitamin K-dependent coagulation proteins have specific association sites that allow them to form hetero-dimers. The calcium-induced formation of a hetero-dimer between fragment 1 and factor X is demonstrated by cross-linking. Such hetero-dimers of vitamin K-dependent proteins could be significant in the coagulation system.
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Harlos, K., Holland, S., Boys, C. et al. Vitamin K-dependent blood coagulation proteins form hetero-dimers. Nature 330, 82–84 (1987). https://doi.org/10.1038/330082a0
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DOI: https://doi.org/10.1038/330082a0
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