1qfk

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[[Image:1qfk.jpg|left|200px]]
[[Image:1qfk.jpg|left|200px]]
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{{Structure
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<!--
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|PDB= 1qfk |SIZE=350|CAPTION= <scene name='initialview01'>1qfk</scene>, resolution 2.800&Aring;
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The line below this paragraph, containing "STRUCTURE_1qfk", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CH2:METHYLENE+GROUP'>CH2</scene>, <scene name='pdbligand=DPN:D-PHENYLALANINE'>DPN</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=FUL:BETA-L-FUCOSE'>FUL</scene>, <scene name='pdbligand=GLC:GLUCOSE'>GLC</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Coagulation_factor_VIIa Coagulation factor VIIa], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.21 3.4.21.21] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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|DOMAIN=
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{{STRUCTURE_1qfk| PDB=1qfk | SCENE= }}
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qfk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qfk OCA], [http://www.ebi.ac.uk/pdbsum/1qfk PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1qfk RCSB]</span>
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}}
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'''STRUCTURE OF HUMAN FACTOR VIIA AND ITS IMPLICATIONS FOR THE TRIGGERING OF BLOOD COAGULATION'''
'''STRUCTURE OF HUMAN FACTOR VIIA AND ITS IMPLICATIONS FOR THE TRIGGERING OF BLOOD COAGULATION'''
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[[Category: Pike, A C.W.]]
[[Category: Pike, A C.W.]]
[[Category: Roberts, S M.]]
[[Category: Roberts, S M.]]
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[[Category: blood coagulation]]
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[[Category: Blood coagulation]]
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[[Category: serine protease]]
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[[Category: Serine protease]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:12:34 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:12:47 2008''
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Revision as of 03:12, 3 May 2008

Image:1qfk.jpg

Template:STRUCTURE 1qfk

STRUCTURE OF HUMAN FACTOR VIIA AND ITS IMPLICATIONS FOR THE TRIGGERING OF BLOOD COAGULATION


Overview

Factor VIIa (EC 3.4.21.21) is a trypsin-like serine protease that plays a key role in the blood coagulation cascade. On injury, factor VIIa forms a complex with its allosteric regulator, tissue factor, and initiates blood clotting. Although the structure of the binary complex has already been determined [Banner, D. W., D'Arcy, A., Chene, C., Winkler, F. K., Guha, A., Konigsberg, W. H., Nemerson, Y. & Kirchhofer, D. (1996) Nature (London) 380, 41-46], the conformational effects of cofactor binding to factor VIIa are not known in detail because of a lack of structural information on free factor VIIa. Here we report the structure of gamma-carboxyglutamic acid-domainless human coagulation factor VIIa at a resolution of 2.8 A. The molecule adopts an extended conformation within the crystal similar to that previously observed for the full-length protein in complex with tissue factor. Detailed comparison of free and tissue factor-bound factor VIIa reveals several structural differences. The binding mode of the active-site inhibitor D-Phe-Phe-Arg methyl ketone differs in the two structures, suggesting a role for the cofactor in substrate recognition. More importantly, a surface-exposed alpha-helix in the protease domain (residues 307-312), which is located at the cofactor recognition site, is distorted in the free form of factor VIIa. This subtle structural difference sheds light on the mechanism of the dramatic tissue factor-induced enhancement of factor VIIa activity.

About this Structure

1QFK is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structure of human factor VIIa and its implications for the triggering of blood coagulation., Pike AC, Brzozowski AM, Roberts SM, Olsen OH, Persson E, Proc Natl Acad Sci U S A. 1999 Aug 3;96(16):8925-30. PMID:10430872 Page seeded by OCA on Sat May 3 06:12:34 2008

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