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2iap

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Revision as of 07:51, 4 July 2018

Crystal structure of squid ganglion DFPase E21Q mutant

Structural highlights

2iap is a 1 chain structure with sequence from Common european squid. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	1e1a, 1pjx, 2iao, 2iaq, 2iar, 2ias, 2iat, 2iau, 2iav, 2iaw, 2iax
Activity:	Diisopropyl-fluorophosphatase, with EC number 3.1.8.2
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[DFPA_LOLVU] Biological function and substrate unknown. However, it is capable of acting on phosphorus anhydride bonds (such as phosphorus-halide and phosphorus-cyanide) in organophosphorus compounds (including nerve gases).^[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

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.

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^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Katsemi V, Lucke C, Koepke J, Lohr F, Maurer S, Fritzsch G, Ruterjans H. Mutational and structural studies of the diisopropylfluorophosphatase from Loligo vulgaris shed new light on the catalytic mechanism of the enzyme. Biochemistry. 2005 Jun 28;44(25):9022-33. PMID:15966726 doi:10.1021/bi0500675
↑ Scharff EI, Koepke J, Fritzsch G, Lucke C, Ruterjans H. Crystal structure of diisopropylfluorophosphatase from Loligo vulgaris. Structure. 2001 Jun;9(6):493-502. PMID:11435114

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2iap"

@@ Line 1: / Line 1: @@
 ==Crystal structure of squid ganglion DFPase E21Q mutant==
 <StructureSection load='2iap' size='340' side='right' caption='[[2iap]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1e1a|1e1a]], [[1pjx|1pjx]], [[2iao|2iao]], [[2iaq|2iaq]], [[2iar|2iar]], [[2ias|2ias]], [[2iat|2iat]], [[2iau|2iau]], [[2iav|2iav]], [[2iaw|2iaw]], [[2iax|2iax]]</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Diisopropyl-fluorophosphatase Diisopropyl-fluorophosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.8.2 3.1.8.2] </span></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2iap FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2iap OCA], [http://pdbe.org/2iap PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2iap RCSB], [http://www.ebi.ac.uk/pdbsum/2iap PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2iap FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2iap OCA], [http://pdbe.org/2iap PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2iap RCSB], [http://www.ebi.ac.uk/pdbsum/2iap PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2iap ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 14: / Line 15: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ia/2iap_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ia/2iap_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

2iap

From Proteopedia

Revision as of 07:51, 4 July 2018

Crystal structure of squid ganglion DFPase E21Q mutant

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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