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2iaq

From Proteopedia

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[[Image:2iaq.gif|left|200px]]
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{{STRUCTURE_2iaq| PDB=2iaq | SCENE= }}
{{STRUCTURE_2iaq| PDB=2iaq | SCENE= }}
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'''Crystal structure of squid ganglion DFPase S271A mutant'''
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===Crystal structure of squid ganglion DFPase S271A mutant===
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==Overview==
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BACKGROUND: Phosphotriesterases (PTE) are enzymes capable of detoxifying organophosphate-based chemical warfare agents by hydrolysis. One subclass of these enzymes comprises the family of diisopropylfluorophosphatases (DFPases). The DFPase reported here was originally isolated from squid head ganglion of Loligo vulgaris and can be characterized as squid-type DFPase. It is capable of hydrolyzing the organophosphates diisopropylfluorophosphate, soman, sarin, tabun, and cyclosarin. RESULTS: Crystals were grown of both the native and the selenomethionine-labeled enzyme. The X-ray crystal structure of the DFPase from Loligo vulgaris has been solved by MAD phasing and refined to a crystallographic R value of 17.6% at a final resolution of 1.8 A. Using site-directed mutagenesis, we have structurally and functionally characterized essential residues in the active site of the enzyme. CONCLUSIONS: The crystal structure of the DFPase from Loligo vulgaris is the first example of a structural characterization of a squid-type DFPase and the second crystal structure of a PTE determined to date. Therefore, it may serve as a structural model for squid-type DFPases in general. The overall structure of this protein represents a six-fold beta propeller with two calcium ions bound in a central water-filled tunnel. The consensus motif found in the blades of this beta propeller has not yet been observed in other beta propeller structures. Based on the results obtained from mutants of active-site residues, a mechanistic model for the DFP hydrolysis has been developed.
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(as it appears on PubMed at http://www.pubmed.gov), where 11435114 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11435114}}
==About this Structure==
==About this Structure==
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[[Category: Calcium-binding site]]
[[Category: Calcium-binding site]]
[[Category: Phosphotriesterase]]
[[Category: Phosphotriesterase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 04:43:33 2008''

Revision as of 01:43, 28 July 2008

Image:2iaq.png

Template:STRUCTURE 2iaq

Crystal structure of squid ganglion DFPase S271A mutant

Template:ABSTRACT PUBMED 11435114

About this Structure

2IAQ is a Single protein structure of sequence from Loligo vulgaris. Full crystallographic information is available from OCA.

Reference

Crystal structure of diisopropylfluorophosphatase from Loligo vulgaris., Scharff EI, Koepke J, Fritzsch G, Lucke C, Ruterjans H, Structure. 2001 Jun;9(6):493-502. PMID:11435114

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