1qhr

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[[Image:1qhr.gif|left|200px]]
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{{Seed}}
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{{STRUCTURE_1qhr| PDB=1qhr | SCENE= }}
{{STRUCTURE_1qhr| PDB=1qhr | SCENE= }}
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'''NOVEL COVALENT ACTIVE SITE THROMBIN INHIBITORS'''
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===NOVEL COVALENT ACTIVE SITE THROMBIN INHIBITORS===
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==Overview==
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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.
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The line below this paragraph, {{ABSTRACT_PUBMED_10387040}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 10387040 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10387040}}
==About this Structure==
==About this Structure==
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[[Category: Proteinase]]
[[Category: Proteinase]]
[[Category: Trypsin like proteinase]]
[[Category: Trypsin like proteinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:17:13 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 04:14:34 2008''

Revision as of 01:14, 28 July 2008

Image:1qhr.png

Template:STRUCTURE 1qhr

NOVEL COVALENT ACTIVE SITE THROMBIN INHIBITORS

Template:ABSTRACT PUBMED 10387040

About this Structure

1QHR is a Protein complex structure of sequences from Homo sapiens. 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

Page seeded by OCA on Mon Jul 28 04:14:34 2008

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