1xmn
From Proteopedia
(New page: 200px<br /> <applet load="1xmn" size="450" color="white" frame="true" align="right" spinBox="true" caption="1xmn, resolution 1.85Å" /> '''Crystal structure o...) |
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| - | [[Image:1xmn.gif|left|200px]]<br /> | + | [[Image:1xmn.gif|left|200px]]<br /><applet load="1xmn" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1xmn" size=" | + | |
caption="1xmn, resolution 1.85Å" /> | caption="1xmn, resolution 1.85Å" /> | ||
'''Crystal structure of thrombin bound to heparin'''<br /> | '''Crystal structure of thrombin bound to heparin'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Thrombin is the final protease in the blood coagulation cascade and serves | + | Thrombin is the final protease in the blood coagulation cascade and serves both pro- and anticoagulant functions through the cleavage of several targets. The ability of thrombin to specifically recognize a wide range of substrates derives from interactions that occur outside of the active site of thrombin. Thrombin possesses two anion binding exosites, which mediate many of its interactions with cofactors and substrates, and although many structures of thrombin have been solved, few such interactions have been described in molecular detail. Glycosaminoglycan binding to exosite II of thrombin plays a major role in switching off the procoagulant functions of thrombin by mediating its irreversible inhibition by circulating serpins and by its binding to the endothelial cell surface receptor thrombomodulin. Here we report the 1.85-A structure of human alpha-thrombin bound to a heparin fragment of eight monosaccharide units in length. The asymmetric unit is composed of two thrombin dimers, each sharing a single heparin octasaccharide chain. The observed interactions are fully consistent with previous mutagenesis studies and illustrate on a molecular level the cofactor interaction that is critical for the restriction of clotting to the site of blood vessel injury. |
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1XMN is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with NA and GOL as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Thrombin Thrombin], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.5 3.4.21.5] Full crystallographic information is available from [http:// | + | 1XMN is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=NA:'>NA</scene> and <scene name='pdbligand=GOL:'>GOL</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Thrombin Thrombin], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.5 3.4.21.5] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XMN OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Thrombin]] | [[Category: Thrombin]] | ||
[[Category: Cama, E.]] | [[Category: Cama, E.]] | ||
| - | [[Category: Carter, W | + | [[Category: Carter, W J.]] |
| - | [[Category: Huntington, J | + | [[Category: Huntington, J A.]] |
[[Category: GOL]] | [[Category: GOL]] | ||
[[Category: NA]] | [[Category: NA]] | ||
[[Category: blood clotting]] | [[Category: blood clotting]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:56:31 2008'' |
Revision as of 13:56, 21 February 2008
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Crystal structure of thrombin bound to heparin
Contents |
Overview
Thrombin is the final protease in the blood coagulation cascade and serves both pro- and anticoagulant functions through the cleavage of several targets. The ability of thrombin to specifically recognize a wide range of substrates derives from interactions that occur outside of the active site of thrombin. Thrombin possesses two anion binding exosites, which mediate many of its interactions with cofactors and substrates, and although many structures of thrombin have been solved, few such interactions have been described in molecular detail. Glycosaminoglycan binding to exosite II of thrombin plays a major role in switching off the procoagulant functions of thrombin by mediating its irreversible inhibition by circulating serpins and by its binding to the endothelial cell surface receptor thrombomodulin. Here we report the 1.85-A structure of human alpha-thrombin bound to a heparin fragment of eight monosaccharide units in length. The asymmetric unit is composed of two thrombin dimers, each sharing a single heparin octasaccharide chain. The observed interactions are fully consistent with previous mutagenesis studies and illustrate on a molecular level the cofactor interaction that is critical for the restriction of clotting to the site of blood vessel injury.
Disease
Known diseases associated with this structure: Dysprothrombinemia OMIM:[176930], Hyperprothrombinemia OMIM:[176930], Hypoprothrombinemia OMIM:[176930]
About this Structure
1XMN is a Protein complex structure of sequences from Homo sapiens with and as ligands. Active as Thrombin, with EC number 3.4.21.5 Full crystallographic information is available from OCA.
Reference
Crystal structure of thrombin bound to heparin., Carter WJ, Cama E, Huntington JA, J Biol Chem. 2005 Jan 28;280(4):2745-9. Epub 2004 Nov 17. PMID:15548541
Page seeded by OCA on Thu Feb 21 15:56:31 2008
Categories: Homo sapiens | Protein complex | Thrombin | Cama, E. | Carter, W J. | Huntington, J A. | GOL | NA | Blood clotting
