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J. Biol. Chem., Vol. 263, Issue 12, 5714-5723, 04, 1988
S Krishnaswamy and KG Mann
The analysis of free sulfhydryl groups in factor Va using dithiobis-
(nitrobenzoic acid) (DTNB) indicated the presence of one accessible thiol
in each of the two subunits of the cofactor. Intact factor Va contained one
readily accessible sulfhydryl group under native conditions and
approximately two such groups after denaturation. A comparison of the rate
of modification of the accessible thiol in factor Va under native
conditions to those observed with the isolated subunits indicated that the
thiol present in component D of the cofactor was readily accessible to
reaction with DTNB. Factor Va was reacted with the sulfhydryl-directed
fluorophore N-(1-pyrene)maleimide, resulting in the concomitant loss of the
accessible thiol with no detectable alteration in the activity of the
cofactor. This fluorescent derivative of factor Va (Pyr-Va) was used to
examine the binding of factor Va to phospholipid vesicles by fluorescence
polarization. Fluorescence polarization of the pyrene moiety increased
saturably when Pyr-Va was titrated with increasing concentrations of
vesicles composed of phosphatidylcholine and phosphatidylserine (PS).
Systematic analysis of the binding of Pyr-Va to PCPS (75%
phosphatidylcholine, 25% PS) indicated that the binding interaction was
characterized by a dissociation constant of 2.7 x 10(-9) M with 42 mol of
PCPS bound per mol of Va at saturation. The data obtained by varying the PS
content of the vesicles are consistent with the interpretation that the Va-
combining site on the vesicle surface is composed of a discrete number of
PS molecules. The binding of Pyr-Va to PCPS was independent of added
calcium ion and could be reversed by the addition of unlabeled Va or
isolated component E but not by component D. Analysis of the displacement
curves indicated that native factor Va or isolated component E and Pyr-Va
mutually excluded each other on the vesicle surface with identical
affinities. Competition experiments conducted using component E digested by
factor Xa or the isolated derivative peptides indicated that the cleavage
of component E by factor Xa had no effect on the PCPS binding properties of
this subunit. Further, the data obtained with the isolated peptides suggest
that the lipid-binding domain of component E is present in the
amino-terminal region of this subunit.
The binding of factor Va to phospholipid vesicles
Department of Biochemistry, University of Vermont, Burlington 05405.
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