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1jia

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[[Image:1jia.gif|left|200px]]
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{{STRUCTURE_1jia| PDB=1jia | SCENE= }}
{{STRUCTURE_1jia| PDB=1jia | SCENE= }}
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'''STRUCTURE OF A BASIC PHOSPHOLIPASE A2 FROM AGKISTRODON HALYS PALLAS AT 2.13A RESOLUTION'''
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===STRUCTURE OF A BASIC PHOSPHOLIPASE A2 FROM AGKISTRODON HALYS PALLAS AT 2.13A RESOLUTION===
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==Overview==
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The basic phospholipase A2 isolated from the venom of Agkistrodon halys Pallas (Agkistrodon blomhoffii Brevicaudus) is a hemolytic toxin and one of the few PLA2's capable of hydrolyzing the phospholipids of E. coli membranes in the presence of a bactericidal/permeability-increasing protein (BPI) of neutrophils. The crystal structure has been determined and refined at 2.13 A to an R factor of 16.5% (F &gt; 3sigma) with excellent stereochemistry. A superposition of the two molecules in the asymmetric unit gives an r. m.s. deviation of 0.326 A for all Calpha atoms. The refined structure allowed a detailed comparison with other PLA2 species of known structures. The overall architecture is similar to those of other PLA2's with a few significant differences. One of which is in the region connecting the N-terminal helix and the Ca2+-binding loop. Unexpectedly, the conformation of the peptide plane Cys29-Gly30 in the Ca2+-binding loop is very different to that of other PLA2's. The amide NH of Gly30 does not point toward the proposed site for stabilization of the tetrahedral intermediate oxyanion of the substrate analogue. The structure includes four residues which occur less frequently in other PLA2's. His1, Arg6 and Trp70 located at the interfacial recognition site may play an important role in the interaction with aggregated substrates, while Trp77 contributes to the hydrophobic interactions between the beta-wing and the main body of the molecule. This structure analysis reveals that two clusters of basic residues are located at or near the interfacial recognition site, forming an asymmetric positively charge distribution. In contrast to the acidic isoform, the present enzyme is a dimer in the crystalline state. The special phospholipid hydrolysis behaviors are discussed in the light of the structure determined.
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(as it appears on PubMed at http://www.pubmed.gov), where 9761847 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9761847}}
==About this Structure==
==About this Structure==
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[[Category: Agkistrodon halys pallas crystal structure]]
[[Category: Agkistrodon halys pallas crystal structure]]
[[Category: Phospholipase a2]]
[[Category: Phospholipase a2]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 20:17:18 2008''

Revision as of 17:17, 1 July 2008

Image:1jia.png

Template:STRUCTURE 1jia

STRUCTURE OF A BASIC PHOSPHOLIPASE A2 FROM AGKISTRODON HALYS PALLAS AT 2.13A RESOLUTION

Template:ABSTRACT PUBMED 9761847

About this Structure

1JIA is a Single protein structure of sequence from Gloydius halys. Full crystallographic information is available from OCA.

Reference

Structure of a basic phospholipase A2 from Agkistrodon halys Pallas at 2.13 A resolution., Zhao K, Song S, Lin Z, Zhou Y, Acta Crystallogr D Biol Crystallogr. 1998 Jul 1;54(Pt 4):510-21. PMID:9761847

Page seeded by OCA on Tue Jul 1 20:17:18 2008

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