The protein structure and effect of factor VIII.
Factor VIII (FVIII) is a key component of the fluid phase of the blood coagulation system. The proteases efficiently cleave FVIII at three sites, two within the heavy and one within the light chain resulting in alteration of its covalent structure and conformation and yielding the active cofactor, FVIIIa. FVIIIa is a trimer composed of A1, A2 and A3-C1-C2 subunits. The role of FVIIIa is to markedly increase the catalytic efficiency of factor IXa in the activation of factor X. Variants of these factors frequently also lead to severe bleeding disorders.
Department of Cardiology, Tongji Hospital, Tongji University, Shanghai 200065, China. de_61@Yahoo.com.cn
Hong
H
Fang
Lemin
L
Wang
Hongbao
H
Wang
D001777:Blood Coagulation; D020134:Catalytic Domain; D019281:Dimerization; D005169:Factor VIII / Q000737:chemistry / Q000235:genetics* / Q000502:physiology*; D006467:Hemophilia A / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007477:Ions; D009154:Mutation; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry
D007477:Ions; D011994:Recombinant Proteins; D005169:Factor VIII