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2aiq

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[[Image:2aiq.gif|left|200px]]
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{{STRUCTURE_2aiq| PDB=2aiq | SCENE= }}
{{STRUCTURE_2aiq| PDB=2aiq | SCENE= }}
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'''Crystal structure of benzamidine-inhibited protein C activator from the venom of copperhead snake Agkistrodon contortrix contortrix'''
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===Crystal structure of benzamidine-inhibited protein C activator from the venom of copperhead snake Agkistrodon contortrix contortrix===
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==Overview==
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Protein C activation initiated by the thrombin-thrombomodulin complex forms the major physiological anticoagulant pathway. Agkistrodon contortrix contortrix protein C activator, a glycosylated single-chain serine proteinase, activates protein C without relying on thrombomodulin. The crystal structures of native and inhibited Agkistrodon contortrix contortrix protein C activator determined at 1.65 and 1.54 A resolutions, respectively, indicate the pivotal roles played by the positively charged belt and the strategic positioning of the three carbohydrate moieties surrounding the catalytic site in protein C recognition, binding, and activation. Structural changes in the benzamidine-inhibited enzyme suggest a probable function in allosteric regulation for the anion-binding site located in the C-terminal extension, which is fully conserved in snake venom serine proteinases, that preferentially binds Cl(1-) instead of SO(4)(2-).
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(as it appears on PubMed at http://www.pubmed.gov), where 16162508 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16162508}}
==About this Structure==
==About this Structure==
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[[Category: Protein c activator]]
[[Category: Protein c activator]]
[[Category: Snake venom serine proteinase]]
[[Category: Snake venom serine proteinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:06:02 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 17:33:49 2008''

Revision as of 14:33, 28 July 2008

Image:2aiq.png

Template:STRUCTURE 2aiq

Crystal structure of benzamidine-inhibited protein C activator from the venom of copperhead snake Agkistrodon contortrix contortrix

Template:ABSTRACT PUBMED 16162508

About this Structure

2AIQ is a Single protein structure of sequence from Agkistrodon contortrix contortrix. Full crystallographic information is available from OCA.

Reference

Thrombomodulin-independent activation of protein C and specificity of hemostatically active snake venom serine proteinases: crystal structures of native and inhibited Agkistrodon contortrix contortrix protein C activator., Murakami MT, Arni RK, J Biol Chem. 2005 Nov 25;280(47):39309-15. Epub 2005 Sep 14. PMID:16162508

Page seeded by OCA on Mon Jul 28 17:33:49 2008

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