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. 1997 Nov;73(5):2638–2652. doi: 10.1016/S0006-3495(97)78293-6

Roles of factor Va heavy and light chains in protein and lipid rearrangements associated with the formation of a bovine factor Va-membrane complex.

V Koppaka 1, W F Talbot 1, X Zhai 1, B R Lentz 1
PMCID: PMC1181166  PMID: 9370458

Abstract

Factor Va is an essential protein cofactor of the enzyme factor Xa, which activates prothrombin to thrombin during blood coagulation. Peptides with an apparent Mr of approximately 94,000 (heavy chain; HC) and approximately 74,000 or 72,000 (light chain; LC) interact in the presence of Ca2+ to form active Va. The two forms of Va-LC differ in their carboxyl-terminal C2 domain. Using Va reconstituted with either LC form, we examined the effects of the two LC species on membrane binding and on the activity of membrane-bound Va. We found that 1) Va composed of the 72,000 LC bound only slightly more tightly to membranes composed of a mixture of neutral and acidic lipids, the Kd being reduced by a factor of approximately 3 at 5 mM and by a factor of 6 at 2 mM Ca2+. 2) The two forms of Va seemed to undergo different conformational changes when bound to a membrane. 3) The activity of bovine Va varied somewhat with LC species, the difference being greatest at limiting Xa concentration. We have also addressed the role of the two Va peptides in membrane lipid rearrangements and binding: 1) Va binding increased lateral packing density in mixed neutral/acidic lipid membranes. In the solid phase, Va-HC had no effect, whereas Va-LC and whole Va had similar but small effects. In the fluid phase, Va-HC and whole Va both altered membrane packing, with Va-HC having the largest effect. 2) Va-HC bound reversibly and in a Ca2+-independent fashion to membranes composed of neutral phospholipid (Kd, approximately 0.3 microM; stoichiometry approximately 91). High ionic strength had little effect on binding. 3) The substantial effect of Va on packing within neutral phospholipid membranes was mimicked by Va-HC. 4) Based on measurements of membrane phase behavior, binding of Va or its peptide components did not induce thermodynamically discernible lateral membrane domains. These results suggest that the membrane association of factor Va is a complex process involving both chains of Va, changes in lipid packing, and changes in protein structure.

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Selected References

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