Soluble phosphatidylserine binds to a single identified site in the C2 domain of human factor Va

A. Srivastava, M. A. Quinn-Allen, Suhng Wook Kim, W. H. Kane, B. R. Lentz

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Factor Va (FVa) is a cofactor for the serine protease factor Xa that activates prothrombin to thrombin in the presence of Ca2+ and a membrane surface. FVa is a heterodimer composed of one heavy chain (A1 and A2 domains) and one light chain (A3, C1, and C2 domains). We use fluorescence, circular dichroism, and equilibrium dialysis to demonstrate that (1) the FV C2 domain expressed in Sf9 cells binds one molecule of C6PS with a kd of ∼2 μM, (2) stabilizing changes occur in the FV C2 domain upon C6PS binding, (3) the C6PS binding site in the FV C2 domain is located near residue Cys2113, which reacts with DTNB, and (4) binding to a PS-containing membrane is an order of magnitude tighter than that to soluble C6PS. Coupled with a recently published crystal structure of the C2 domain, these results support a model for the mechanism of C2-membrane interaction.

Original languageEnglish
Pages (from-to)8246-8255
Number of pages10
JournalBiochemistry
Volume40
Issue number28
DOIs
Publication statusPublished - 2001 Jul 17
Externally publishedYes

Fingerprint

Factor Va
Phosphatidylserines
Human engineering
Membranes
Dithionitrobenzoic Acid
Factor Xa
Dialysis
Serine Proteases
Prothrombin
Thrombin
Sf9 Cells
Crystal structure
Fluorescence
Binding Sites
Circular Dichroism
Molecules
varespladib methyl
C2 Domains
Light

ASJC Scopus subject areas

  • Biochemistry

Cite this

Soluble phosphatidylserine binds to a single identified site in the C2 domain of human factor Va . / Srivastava, A.; Quinn-Allen, M. A.; Kim, Suhng Wook; Kane, W. H.; Lentz, B. R.

In: Biochemistry, Vol. 40, No. 28, 17.07.2001, p. 8246-8255.

Research output: Contribution to journalArticle

Srivastava, A. ; Quinn-Allen, M. A. ; Kim, Suhng Wook ; Kane, W. H. ; Lentz, B. R. / Soluble phosphatidylserine binds to a single identified site in the C2 domain of human factor Va In: Biochemistry. 2001 ; Vol. 40, No. 28. pp. 8246-8255.
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AB - Factor Va (FVa) is a cofactor for the serine protease factor Xa that activates prothrombin to thrombin in the presence of Ca2+ and a membrane surface. FVa is a heterodimer composed of one heavy chain (A1 and A2 domains) and one light chain (A3, C1, and C2 domains). We use fluorescence, circular dichroism, and equilibrium dialysis to demonstrate that (1) the FV C2 domain expressed in Sf9 cells binds one molecule of C6PS with a kd of ∼2 μM, (2) stabilizing changes occur in the FV C2 domain upon C6PS binding, (3) the C6PS binding site in the FV C2 domain is located near residue Cys2113, which reacts with DTNB, and (4) binding to a PS-containing membrane is an order of magnitude tighter than that to soluble C6PS. Coupled with a recently published crystal structure of the C2 domain, these results support a model for the mechanism of C2-membrane interaction.

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