1qhr
From Proteopedia
(New page: 200px<br /> <applet load="1qhr" size="450" color="white" frame="true" align="right" spinBox="true" caption="1qhr, resolution 2.2Å" /> '''NOVEL COVALENT ACTIV...) |
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| - | [[Image:1qhr.gif|left|200px]]<br /> | + | [[Image:1qhr.gif|left|200px]]<br /><applet load="1qhr" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1qhr" size=" | + | |
caption="1qhr, resolution 2.2Å" /> | caption="1qhr, resolution 2.2Å" /> | ||
'''NOVEL COVALENT ACTIVE SITE THROMBIN INHIBITORS'''<br /> | '''NOVEL COVALENT ACTIVE SITE THROMBIN INHIBITORS'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The binding modes of four active site-directed, acylating inhibitors of | + | The binding modes of four active site-directed, acylating inhibitors of human alpha-thrombin have been determined using X-ray crystallography. These inhibitors (GR157368, GR166081, GR167088, and GR179849) are representatives of a series utilizing a novel 5, 5-trans-lactone template to specifically acylate Ser195 of thrombin, resulting in an acyl complex. In each case the crystal structure of the complex reveals a binding mode which is consistent with the formation of a covalent bond between the ring-opened lactone of the inhibitor and residue Ser195. Improvements in potency and selectivity of these inhibitors for thrombin are rationalized on the basis of the observed protein/inhibitor interactions identified in these complexes. Occupation of the thrombin S2 and S3 pockets is shown to be directly correlated with improved binding and a degree of selectivity. The binding mode of GR179849 to thrombin is compared with the thrombin/PPACK complex [Bode, W., Turk, D., and Karshikov, A. (1992) Protein Sci. 1, 426-471] as this represents the archetypal binding mode for a thrombin inhibitor. This series of crystal structures is the first to be reported of synthetic, nonpeptidic acylating inhibitors bound to thrombin and provides details of the molecular recognition features that resulted in nanomolar potency. |
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1QHR 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 157 as [http://en.wikipedia.org/wiki/ligand ligand]. 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:// | + | 1QHR 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=157:'>157</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. 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=1QHR OCA]. |
==Reference== | ==Reference== | ||
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[[Category: trypsin like proteinase]] | [[Category: trypsin like proteinase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:39:48 2008'' |
Revision as of 12:39, 21 February 2008
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NOVEL COVALENT ACTIVE SITE THROMBIN INHIBITORS
Contents |
Overview
The binding modes of four active site-directed, acylating inhibitors of human alpha-thrombin have been determined using X-ray crystallography. These inhibitors (GR157368, GR166081, GR167088, and GR179849) are representatives of a series utilizing a novel 5, 5-trans-lactone template to specifically acylate Ser195 of thrombin, resulting in an acyl complex. In each case the crystal structure of the complex reveals a binding mode which is consistent with the formation of a covalent bond between the ring-opened lactone of the inhibitor and residue Ser195. Improvements in potency and selectivity of these inhibitors for thrombin are rationalized on the basis of the observed protein/inhibitor interactions identified in these complexes. Occupation of the thrombin S2 and S3 pockets is shown to be directly correlated with improved binding and a degree of selectivity. The binding mode of GR179849 to thrombin is compared with the thrombin/PPACK complex [Bode, W., Turk, D., and Karshikov, A. (1992) Protein Sci. 1, 426-471] as this represents the archetypal binding mode for a thrombin inhibitor. This series of crystal structures is the first to be reported of synthetic, nonpeptidic acylating inhibitors bound to thrombin and provides details of the molecular recognition features that resulted in nanomolar potency.
Disease
Known diseases associated with this structure: Dysprothrombinemia OMIM:[176930], Hyperprothrombinemia OMIM:[176930], Hypoprothrombinemia OMIM:[176930]
About this Structure
1QHR is a Protein complex structure of sequences from Homo sapiens with as ligand. Active as Thrombin, with EC number 3.4.21.5 Full crystallographic information is available from OCA.
Reference
Crystal structures of thrombin complexed to a novel series of synthetic inhibitors containing a 5,5-trans-lactone template., Jhoti H, Cleasby A, Reid S, Thomas PJ, Weir M, Wonacott A, Biochemistry. 1999 Jun 22;38(25):7969-77. PMID:10387040
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