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| | ==Crystal structure of squid ganglion DFPase E37Q mutant== | | ==Crystal structure of squid ganglion DFPase E37Q mutant== |
| - | <StructureSection load='2iao' size='340' side='right' caption='[[2iao]], [[Resolution|resolution]] 2.00Å' scene=''> | + | <StructureSection load='2iao' size='340' side='right'caption='[[2iao]], [[Resolution|resolution]] 2.00Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2iao]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Common_european_squid Common european squid]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IAO OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IAO FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2iao]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Loligo_vulgaris Loligo vulgaris]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IAO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2IAO FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1e1a|1e1a]], [[1pjx|1pjx]], [[2iap|2iap]], [[2iaq|2iaq]], [[2iar|2iar]], [[2ias|2ias]], [[2iat|2iat]], [[2iau|2iau]], [[2iav|2iav]], [[2iaw|2iaw]], [[2iax|2iax]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></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'>[https://proteopedia.org/fgij/fg.htm?mol=2iao FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2iao OCA], [https://pdbe.org/2iao PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2iao RCSB], [https://www.ebi.ac.uk/pdbsum/2iao PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2iao ProSAT]</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=2iao FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2iao OCA], [http://pdbe.org/2iao PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2iao RCSB], [http://www.ebi.ac.uk/pdbsum/2iao PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2iao ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/DFPA_LOLVU 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).<ref>PMID:15966726</ref> | + | [https://www.uniprot.org/uniprot/DFPA_LOLVU 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).<ref>PMID:15966726</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Common european squid]] | + | [[Category: Large Structures]] |
| - | [[Category: Diisopropyl-fluorophosphatase]] | + | [[Category: Loligo vulgaris]] |
| - | [[Category: Fritzsch, G]] | + | [[Category: Fritzsch G]] |
| - | [[Category: Koepke, J]] | + | [[Category: Koepke J]] |
| - | [[Category: Luecke, C]] | + | [[Category: Luecke C]] |
| - | [[Category: Rueterjans, H]] | + | [[Category: Rueterjans H]] |
| - | [[Category: Scharff, E I]] | + | [[Category: Scharff EI]] |
| - | [[Category: Beta-propeller]]
| + | |
| - | [[Category: Calcium-binding site]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Phosphotriesterase]]
| + | |
| Structural highlights
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
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