| Structural highlightsDiseaseFA8_HUMAN Defects in F8 are the cause of hemophilia A (HEMA) [MIM:306700. A disorder of blood coagulation characterized by a permanent tendency to hemorrhage. About 50% of patients have severe hemophilia resulting in frequent spontaneous bleeding into joints, muscles and internal organs. Less severe forms are characterized by bleeding after trauma or surgery. Note=Of particular interest for the understanding of the function of F8 is the category of CRM (cross-reacting material) positive patients (approximately 5%) that have considerable amount of F8 in their plasma (at least 30% of normal), but the protein is non-functional; i.e. the F8 activity is much less than the plasma protein level. CRM-reduced is another category of patients in which the F8C antigen and activity are reduced to approximately the same level. Most mutations are CRM negative, and probably affect the folding and stability of the protein.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78]
FunctionFA8_HUMAN Factor VIII, along with calcium and phospholipid, acts as a cofactor for factor IXa when it converts factor X to the activated form, factor Xa.
Publication Abstract from PubMed
Factor VIII (FVIII) is the blood coagulation protein which when defective or deficient causes for hemophilia A, a severe hereditary bleeding disorder. Activated FVIII (FVIIIa) is the cofactor to the serine protease factor IXa (FIXa) within the membrane-bound Tenase complex, responsible for amplifying its proteolytic activity more than 100,000 times, necessary for normal clot formation. FVIII is composed of two noncovalently linked peptide chains: a light chain (LC) holding the membrane interaction sites and a heavy chain (HC) holding the main FIXa interaction sites. The interplay between the light and heavy chains (HCs) in the membrane-bound state is critical for the biological efficiency of FVIII. Here, we present our cryo-electron microscopy (EM) and structure analysis studies of human FVIII-LC, when helically assembled onto negatively charged single lipid bilayer nanotubes. The resolved FVIII-LC membrane-bound structure supports aspects of our previously proposed FVIII structure from membrane-bound two-dimensional (2D) crystals, such as only the C2 domain interacts directly with the membrane. The LC is oriented differently in the FVIII membrane-bound helical and 2D crystal structures based on EM data, and the existing X-ray structures. This flexibility of the FVIII-LC domain organization in different states is discussed in the light of the FVIIIa-FIXa complex assembly and function. (c) 2013 Wiley Periodicals, Inc. Biopolymers 99: 448-459, 2013.
Domain organization of membrane-bound factor VIII.,Stoilova-McPhie S, Lynch GC, Ludtke S, Pettitt BM Biopolymers. 2013 Jul;99(7):448-59. doi: 10.1002/bip.22199. PMID:23616213[79]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See AlsoReferences
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- ↑ Yenchitsomanus P, Akkarapatumwong V, Pung-Amritt P, Intorasoot S, Thanootarakul P, Oranwiroon S, Veerakul G, Mahasandana C. Genotype and phenotype of haemophilia A in Thai patients. Haemophilia. 2003 Mar;9(2):179-86. PMID:12614369
- ↑ Bicocchi MP, Pasino M, Lanza T, Bottini F, Molinari AC, Caprino D, Rosano C, Acquila M. Small FVIII gene rearrangements in 18 hemophilia A patients: five novel mutations. Am J Hematol. 2005 Feb;78(2):117-22. PMID:15682412 doi:10.1002/ajh.20234
- ↑ Hill M, Deam S, Gordon B, Dolan G. Mutation analysis in 51 patients with haemophilia A: report of 10 novel mutations and correlations between genotype and clinical phenotype. Haemophilia. 2005 Mar;11(2):133-41. PMID:15810915 doi:10.1111/j.1365-2516.2005.01069.x
- ↑ Cai XH, Wang XF, Dai J, Fang Y, Ding QL, Xie F, Wang HL. Female hemophilia A heterozygous for a de novo frameshift and a novel missense mutation of factor VIII. J Thromb Haemost. 2006 Sep;4(9):1969-74. Epub 2006 Jun 27. PMID:16805874 doi:JTH2105
- ↑ Vencesla A, Corral-Rodriguez MA, Baena M, Cornet M, Domenech M, Baiget M, Fuentes-Prior P, Tizzano EF. Identification of 31 novel mutations in the F8 gene in Spanish hemophilia A patients: structural analysis of 20 missense mutations suggests new intermolecular binding sites. Blood. 2008 Apr 1;111(7):3468-78. doi: 10.1182/blood-2007-08-108068. Epub 2008, Jan 9. PMID:18184865 doi:10.1182/blood-2007-08-108068
- ↑ Albanez S, Ruiz-Saez A, Boadas A, de Bosch N, Porco A. Identification of factor VIII gene mutations in patients with severe haemophilia A in Venezuela: identification of seven novel mutations. Haemophilia. 2011 Sep;17(5):e913-8. doi: 10.1111/j.1365-2516.2011.02500.x. Epub, 2011 Mar 4. PMID:21371196 doi:10.1111/j.1365-2516.2011.02500.x
- ↑ Stoilova-McPhie S, Lynch GC, Ludtke S, Pettitt BM. Domain organization of membrane-bound factor VIII. Biopolymers. 2013 Jul;99(7):448-59. doi: 10.1002/bip.22199. PMID:23616213 doi:10.1002/bip.22199
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