2h8i

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{{STRUCTURE_2h8i| PDB=2h8i | SCENE= }}
{{STRUCTURE_2h8i| PDB=2h8i | SCENE= }}
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'''Crystal Structure of the Bothropstoxin-I complexed with polyethylene glycol'''
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===Crystal Structure of the Bothropstoxin-I complexed with polyethylene glycol===
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==Overview==
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Lys49 phospholipase A2 homologues are highly myotoxic and cause extensive tissue damage but do not display hydrolytic activity towards natural phospholipids. The binding of heparin, heparin derivatives and polyanionic compounds such as suramin result in partial inhibition (up to 60%) of the myotoxic effects due to a change in the overall charge of the interfacial surface. In vivo experiments demonstrate that polyethylene glycol inhibits more than 90% of the myotoxic effects without exhibiting secondary toxic effects. The crystal structure of bothropstoxin-I complexed with polyethylene glycol reveals that this inhibition is due to steric hindrance of the access to the PLA2-active site-like region. These two inhibitory pathways indicate the roles of the overall surface charge and free accessibility to the PLA2-active site-like region in the functioning of Lys49 phospholipases A2 homologues. Molecular dynamics simulations, small angle X-ray scattering and structural analysis indicate that the oligomeric states both in solution and in the crystalline states of Lys49 phospholipases A2 are principally mediated by hydrophobic contacts formed between the interfacial surfaces. These results provide the framework for the potential application of both clinically approved drugs for the treatment of Viperidae snakebites.
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(as it appears on PubMed at http://www.pubmed.gov), where 17157889 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17157889}}
==About this Structure==
==About this Structure==
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[[Category: Lys49-pla2]]
[[Category: Lys49-pla2]]
[[Category: Myotoxicity]]
[[Category: Myotoxicity]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 05:59:33 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 23:16:40 2008''

Revision as of 20:16, 27 July 2008

Image:2h8i.png

Template:STRUCTURE 2h8i

Crystal Structure of the Bothropstoxin-I complexed with polyethylene glycol

Template:ABSTRACT PUBMED 17157889

About this Structure

2H8I is a Single protein structure of sequence from Bothrops jararacussu. Full crystallographic information is available from OCA.

Reference

Interfacial surface charge and free accessibility to the PLA2-active site-like region are essential requirements for the activity of Lys49 PLA2 homologues., Murakami MT, Vicoti MM, Abrego JR, Lourenzoni MR, Cintra AC, Arruda EZ, Tomaz MA, Melo PA, Arni RK, Toxicon. 2007 Mar 1;49(3):378-87. Epub 2006 Nov 3. PMID:17157889

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