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1cl5

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[[Image:1cl5.gif|left|200px]]
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{{STRUCTURE_1cl5| PDB=1cl5 | SCENE= }}
{{STRUCTURE_1cl5| PDB=1cl5 | SCENE= }}
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'''CRYSTAL STRUCTURE OF PHOSPHOLIPASE A2 FROM DABOIA RUSSELLI PULCHELLA'''
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===CRYSTAL STRUCTURE OF PHOSPHOLIPASE A2 FROM DABOIA RUSSELLI PULCHELLA===
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==Overview==
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The phospholipase A(2 )from Daboia russelli pulchella (DPLA(2)) is the only known member of subclass II of group IIA. The three-dimensional structure of this presynaptic neurotoxic DPLA(2) enzyme has been determined at 2.4 A resolution. The structure was determined by the molecular replacement method using the model Crotalus atrox, and refined using X-PLOR to a final R-factor of 18.8 % for all data in the resolution range 20.0 A-2.4 A. The final refined model comprises 1888 atoms from two crystallographically independent protein molecules and 160 water oxygen atoms. The overall folding of DPLA(2), with three long helices and two short antiparallel beta-strands is grossly similar to those observed for other PLA(2)s. In the present structure, the calcium binding site is empty but the conformation of the calcium binding loop is similar to those observed in the calcium bound states. Two spatially adjacent regions of residues 55-61 (a typical beta-turn I) and 83-94 (a well defined loop) are remarkably different in conformation, electrostatic characteristics and inter-segmental interactions from those found in non-neurotoxic PLA(2)s. Yet another striking structural feature in DPLA(2 )pertains to the stretch of residues 53-77, which has a series of positively charged residues protruding outwardly. The above segment is presumed to be involved in the anticoagulant activity. A unique hydrophobic patch including residues Leu17, Ala18, Ile19, Pro20, Phe106 and Leu110 is found on the surface together with an equally emphatic region of -OH groups containing residues such as Ser21, Tyr22, Ser23, Ser24, Tyr25 and Tyr28. The interactions between two molecules of DPLA(2) in the asymmetric unit are remarkably different from those observed in the standard dimers and trimers of PLA(2)s, leaving the enzyme's active site fully exposed for enzyme-substrate reactions, it makes this structure one of the most favourable examples for structure-based drug design through soaking experiments.
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{{ABSTRACT_PUBMED_10686108}}
==About this Structure==
==About this Structure==
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[[Category: Phospholipase a2]]
[[Category: Phospholipase a2]]
[[Category: X-ray structure]]
[[Category: X-ray structure]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 20:54:05 2008''

Revision as of 17:54, 30 June 2008

Image:1cl5.png

Template:STRUCTURE 1cl5

CRYSTAL STRUCTURE OF PHOSPHOLIPASE A2 FROM DABOIA RUSSELLI PULCHELLA

Template:ABSTRACT PUBMED 10686108

About this Structure

1CL5 is a Single protein structure of sequence from Daboia russellii pulchella. Full crystallographic information is available from OCA.

Reference

Three-dimensional structure of a presynaptic neurotoxic phospholipase A2 from Daboia russelli pulchella at 2.4 A resolution., Chandra V, Kaur P, Srinivasan A, Singh TP, J Mol Biol. 2000 Mar 3;296(4):1117-26. PMID:10686108

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