1czt: Difference between revisions
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{{STRUCTURE_1czt| PDB=1czt | SCENE= }} | |||
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'''CRYSTAL STRUCTURE OF THE C2 DOMAIN OF HUMAN COAGULATION FACTOR V''' | '''CRYSTAL STRUCTURE OF THE C2 DOMAIN OF HUMAN COAGULATION FACTOR V''' | ||
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[[Category: Kane, W H.]] | [[Category: Kane, W H.]] | ||
[[Category: Macedo-Ribeiro, S.]] | [[Category: Macedo-Ribeiro, S.]] | ||
[[Category: | [[Category: Blood clotting]] | ||
[[Category: | [[Category: Calcium-independent]] | ||
[[Category: | [[Category: Coagulation]] | ||
[[Category: | [[Category: Discoidin family]] | ||
[[Category: | [[Category: Membrane-binding]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:17:14 2008'' | |||
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Revision as of 10:17, 2 May 2008
CRYSTAL STRUCTURE OF THE C2 DOMAIN OF HUMAN COAGULATION FACTOR V
Overview
Rapid and controlled clot formation is achieved through sequential activation of circulating serine proteinase precursors on phosphatidylserine-rich procoagulant membranes of activated platelets and endothelial cells. The homologous complexes Xase and prothrombinase, each consisting of an active proteinase and a non-enzymatic cofactor, perform critical steps within this coagulation cascade. The activated cofactors VIIIa and Va, highly specific for their cognate proteinases, are each derived from precursors with the same A1-A2-B-A3-C1-C2 architecture. Membrane binding is mediated by the C2 domains of both cofactors. Here we report two crystal structures of the C2 domain of human factor Va. The conserved beta-barrel framework provides a scaffold for three protruding loops, one of which adopts markedly different conformations in the two crystal forms. We propose a mechanism of calcium-independent, stereospecific binding of factors Va and VIIIa to phospholipid membranes, on the basis of (1) immersion of hydrophobic residues at the apices of these loops in the apolar membrane core; (2) specific interactions with phosphatidylserine head groups in the groove enclosed by these loops; and (3) favourable electrostatic contacts of basic side chains with negatively charged membrane phosphate groups.
About this Structure
1CZT is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structures of the membrane-binding C2 domain of human coagulation factor V., Macedo-Ribeiro S, Bode W, Huber R, Quinn-Allen MA, Kim SW, Ortel TL, Bourenkov GP, Bartunik HD, Stubbs MT, Kane WH, Fuentes-Prior P, Nature. 1999 Nov 25;402(6760):434-9. PMID:10586886 Page seeded by OCA on Fri May 2 13:17:14 2008
