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3li4

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Revision as of 07:07, 7 October 2020

Diisopropyl fluorophosphatase (DFPase), N120D,N175D,D229N mutant

Structural highlights

3li4 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:	3li3, 3li5
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

The calcium-dependent phosphotriesterase diisopropyl fluorophosphatase (DFPase) from the squid Loligo vulgaris efficiently hydrolyzes a wide range of organophosphorus nerve agents. The two calcium ions within DFPase play essential roles for its function. The lower affinity calcium ion located at the bottom of the active site participates in the reaction mechanism, while the high affinity calcium in the center of the protein maintains structural integrity of the enzyme. The activity and structures of three DFPase variants targeting the catalytic calcium-binding site are reported (D121E, N120D/N175D/D229N, and E21Q/N120D/N175D/D229N), and the effect of these mutations on the overall structural dynamics of DFPase is examined using molecular dynamics simulations. While D229 is crucial for enzymatic activity, E21 is essential for calcium binding. Although at least two negatively charged side chains are required for calcium binding, the addition of a third charge significantly lowers the activity. Furthermore, the arrangement of these charges in the binding site is important for enzymatic activity. These results, together with earlier mutational, structural, and kinetic studies, show a highly evolved calcium-binding environment, with a specific electrostatic topology crucial for activity. A number of structural homologues of DFPase have been recently identified, including a chimeric variant of Paraoxonase 1 (PON1), drug resistance protein 35 (Drp35) from Staphylococcus aureus and the gluconolactonase XC5397 from Xanthomonas campestris. Surprisingly, despite low sequence identity, these proteins share remarkably similar calcium-binding environments to DFPase.

Structural characterization of the catalytic calcium-binding site in diisopropyl fluorophosphatase (DFPase)--comparison with related beta-propeller enzymes.,Blum MM, Chen JC Chem Biol Interact. 2010 Sep 6;187(1-3):373-9. Epub 2010 Mar 3. PMID:20206152^[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
↑ Blum MM, Chen JC. Structural characterization of the catalytic calcium-binding site in diisopropyl fluorophosphatase (DFPase)--comparison with related beta-propeller enzymes. Chem Biol Interact. 2010 Sep 6;187(1-3):373-9. Epub 2010 Mar 3. PMID:20206152 doi:10.1016/j.cbi.2010.02.043

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/3li4"

@@ Line 1: / Line 1: @@
 ==Diisopropyl fluorophosphatase (DFPase), N120D,N175D,D229N mutant==
-<StructureSection load='3li4' size='340' side='right' caption='[[3li4]], [[Resolution|resolution]] 1.35&Aring;' scene=''>
+<StructureSection load='3li4' size='340' side='right'caption='[[3li4]], [[Resolution|resolution]] 1.35&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[3li4]] 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=3LI4 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3LI4 FirstGlance]. <br>
+<table><tr><td colspan='2'>[[3li4]] 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=3LI4 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=3LI4 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='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='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3li3|3li3]], [[3li5|3li5]]</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=3li4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3li4 OCA], [http://pdbe.org/3li4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3li4 RCSB], [http://www.ebi.ac.uk/pdbsum/3li4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3li4 ProSAT]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=3li4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3li4 OCA], [http://pdbe.org/3li4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3li4 RCSB], [http://www.ebi.ac.uk/pdbsum/3li4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3li4 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 36: / Line 36: @@
 [[Category: Common european squid]]
 [[Category: Diisopropyl-fluorophosphatase]]
+[[Category: Large Structures]]
 [[Category: Chen, J C.H]]
 [[Category: Beta propeller]]

3li4

From Proteopedia

Revision as of 07:07, 7 October 2020

Diisopropyl fluorophosphatase (DFPase), N120D,N175D,D229N mutant

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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