1e0f: Difference between revisions
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==Overview== | ==Overview== | ||
The serine proteinase alpha-thrombin plays a pivotal role in the, regulation of blood fluidity, and therefore constitutes a primary target, in the treatment of various haemostatic disorders. Haemadin is a slow, tight- binding thrombin inhibitor from the land-living leech Haemadipsa, sylvestris. Here we present the 3.1 A crystal structure of the human, alpha-thrombin- haemadin complex. The N-terminal segment of haemadin binds, to the active site of thrombin, forming a parallel beta-strand with, residues Ser214-Gly216 of the proteinase. This mode of binding is similar, to that observed in another leech-derived inhibitor, hirudin. In contrast, to hirudin, however, the markedly acidic C-terminal peptide of haemadin, does not bind the fibrinogen-recognition exosite, but interacts with the, ... | The serine proteinase alpha-thrombin plays a pivotal role in the, regulation of blood fluidity, and therefore constitutes a primary target, in the treatment of various haemostatic disorders. Haemadin is a slow, tight- binding thrombin inhibitor from the land-living leech Haemadipsa, sylvestris. Here we present the 3.1 A crystal structure of the human, alpha-thrombin- haemadin complex. The N-terminal segment of haemadin binds, to the active site of thrombin, forming a parallel beta-strand with, residues Ser214-Gly216 of the proteinase. This mode of binding is similar, to that observed in another leech-derived inhibitor, hirudin. In contrast, to hirudin, however, the markedly acidic C-terminal peptide of haemadin, does not bind the fibrinogen-recognition exosite, but interacts with the, heparin-binding exosite of thrombin. Thus, haemadin binds to thrombin, according to a novel mechanism, despite an overall structural similarity, with hirudin. Haemadin inhibits both free and thrombomodulin-bound, alpha-thrombin, but not intermediate activation forms such as, meizothrombin. This specific anticoagulant ability of haemadin makes it an, ideal candidate for an antithrombotic agent, as well as a starting point, for the design of novel antithrombotics. | ||
==About this Structure== | ==About this Structure== | ||
1E0F is a | 1E0F is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Haemadipsa_sylvestris Haemadipsa sylvestris] and [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. 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] Structure known Active Site: ATE. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1E0F OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: coagulation/crystal structure/heparin-binding site/ hirudin/thrombin inhibitor]] | [[Category: coagulation/crystal structure/heparin-binding site/ hirudin/thrombin inhibitor]] | ||
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 14:54:03 2007'' | ||
