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1sg8

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{{STRUCTURE_1sg8| PDB=1sg8 | SCENE= }}
{{STRUCTURE_1sg8| PDB=1sg8 | SCENE= }}
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'''Crystal structure of the procoagulant fast form of thrombin'''
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===Crystal structure of the procoagulant fast form of thrombin===
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==Overview==
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Na(+) binding near the primary specificity pocket of thrombin promotes the procoagulant, prothrombotic, and signaling functions of the enzyme. The effect is mediated allosterically by a communication between the Na(+) site and regions involved in substrate recognition. Using a panel of 78 Ala mutants of thrombin, we have mapped the allosteric core of residues that are energetically linked to Na(+) binding. These residues are Asp-189, Glu-217, Asp-222, and Tyr-225, all in close proximity to the bound Na(+). Among these residues, Asp-189 shares with Asp-221 the important function of transducing Na(+) binding into enhanced catalytic activity. None of the residues of exosite I, exosite II, or the 60-loop plays a significant role in Na(+) binding and allosteric transduction. X-ray crystal structures of the Na(+)-free (slow) and Na(+)-bound (fast) forms of thrombin, free or bound to the active site inhibitor H-d-Phe-Pro-Arg-chloromethyl-ketone, document the conformational changes induced by Na(+) binding. The slow --&gt; fast transition results in formation of the Arg-187:Asp-222 ion pair, optimal orientation of Asp-189 and Ser-195 for substrate binding, and a significant shift of the side chain of Glu-192 linked to a rearrangement of the network of water molecules that connect the bound Na(+) to Ser-195 in the active site. The changes in the water network and the allosteric core explain the thermodynamic signatures linked to Na(+) binding and the mechanism of thrombin activation by Na(+). The role of the water network uncovered in this study establishes a new paradigm for the allosteric regulation of thrombin and other Na(+)-activated enzymes involved in blood coagulation and the immune response.
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{{ABSTRACT_PUBMED_15152000}}
==Disease==
==Disease==
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[[Category: Allostery]]
[[Category: Allostery]]
[[Category: Thrombin]]
[[Category: Thrombin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 17:45:42 2008''

Revision as of 14:45, 28 July 2008

Image:1sg8.png

Template:STRUCTURE 1sg8

Contents

Crystal structure of the procoagulant fast form of thrombin

Template:ABSTRACT PUBMED 15152000

Disease

Known disease associated with this structure: Dysprothrombinemia OMIM:[176930], Hyperprothrombinemia OMIM:[176930], Hypoprothrombinemia OMIM:[176930]

About this Structure

1SG8 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Molecular dissection of Na+ binding to thrombin., Pineda AO, Carrell CJ, Bush LA, Prasad S, Caccia S, Chen ZW, Mathews FS, Di Cera E, J Biol Chem. 2004 Jul 23;279(30):31842-53. Epub 2004 May 19. PMID:15152000

Page seeded by OCA on Mon Jul 28 17:45:42 2008

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