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< | ==OpdA from Agrobacterium radiobacter with bound diethyl phosphate from crystal soaking with the compound- 1.9 A== | ||
<StructureSection load='2r1k' size='340' side='right'caption='[[2r1k]], [[Resolution|resolution]] 2.10Å' scene=''> | |||
You may | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2r1k]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Agrobacterium_tumefaciens Agrobacterium tumefaciens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2R1K OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2R1K FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1Å</td></tr> | |||
- | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=DPF:DIETHYL+HYDROGEN+PHOSPHATE'>DPF</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=FE2:FE+(II)+ION'>FE2</scene>, <scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene></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=2r1k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2r1k OCA], [https://pdbe.org/2r1k PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2r1k RCSB], [https://www.ebi.ac.uk/pdbsum/2r1k PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2r1k ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q93LD7_RHIRD Q93LD7_RHIRD] | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/r1/2r1k_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2r1k ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The mechanism by which the binuclear metallophosphotriesterases (PTEs, E.C. 3.1.8.1) catalyse substrate hydrolysis has been extensively studied. The mu-hydroxo bridge between the metal ions has been proposed to be the initiating nucleophile in the hydrolytic reaction. In contrast, analysis of some biomimetic systems has indicated that mu-hydroxo bridges are often not themselves nucleophiles, but act as general bases for freely exchangeable nucleophilic water molecules. Herein, we present crystallographic analyses of a bacterial PTE from Agrobacterium radiobacter, OpdA, capturing the enzyme-substrate complex during hydrolysis. This model of the Michaelis complex suggests the alignment of the substrate will favour attack from a solvent molecule terminally coordinated to the alpha-metal ion. The bridging of both metal ions by the product, without disruption of the mu-hydroxo bridge, is also consistent with nucleophilic attack occurring from the terminal position. When phosphodiesters are soaked into crystals of OpdA, they coordinate bidentately to the beta-metal ion, displacing the mu-hydroxo bridge. Thus, alternative product-binding modes exist for the PTEs, and it is the bridging mode that appears to result from phosphotriester hydrolysis. Kinetic analysis of the PTE and promiscuous phosphodiesterase activities confirms that the presence of a mu-hydroxo bridge during phosphotriester hydrolysis is correlated with a lower pK(a) for the nucleophile, consistent with a general base function during catalysis. | |||
In crystallo capture of a Michaelis complex and product-binding modes of a bacterial phosphotriesterase.,Jackson CJ, Foo JL, Kim HK, Carr PD, Liu JW, Salem G, Ollis DL J Mol Biol. 2008 Feb 1;375(5):1189-96. Epub 2007 Nov 1. PMID:18082180<ref>PMID:18082180</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2r1k" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Phosphotriesterase 3D structures|Phosphotriesterase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
== | |||
== | |||
[[Category: Agrobacterium tumefaciens]] | [[Category: Agrobacterium tumefaciens]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Carr PD]] | |||
[[Category: Carr | [[Category: Foo JL]] | ||
[[Category: Foo | [[Category: Jackson CJ]] | ||
[[Category: Jackson | [[Category: Kim HK]] | ||
[[Category: Kim | [[Category: Liu JW]] | ||
[[Category: Liu | [[Category: Ollis DL]] | ||
[[Category: Ollis | [[Category: Salem G]] | ||
[[Category: Salem | |||
Latest revision as of 12:02, 25 October 2023
OpdA from Agrobacterium radiobacter with bound diethyl phosphate from crystal soaking with the compound- 1.9 AOpdA from Agrobacterium radiobacter with bound diethyl phosphate from crystal soaking with the compound- 1.9 A
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe mechanism by which the binuclear metallophosphotriesterases (PTEs, E.C. 3.1.8.1) catalyse substrate hydrolysis has been extensively studied. The mu-hydroxo bridge between the metal ions has been proposed to be the initiating nucleophile in the hydrolytic reaction. In contrast, analysis of some biomimetic systems has indicated that mu-hydroxo bridges are often not themselves nucleophiles, but act as general bases for freely exchangeable nucleophilic water molecules. Herein, we present crystallographic analyses of a bacterial PTE from Agrobacterium radiobacter, OpdA, capturing the enzyme-substrate complex during hydrolysis. This model of the Michaelis complex suggests the alignment of the substrate will favour attack from a solvent molecule terminally coordinated to the alpha-metal ion. The bridging of both metal ions by the product, without disruption of the mu-hydroxo bridge, is also consistent with nucleophilic attack occurring from the terminal position. When phosphodiesters are soaked into crystals of OpdA, they coordinate bidentately to the beta-metal ion, displacing the mu-hydroxo bridge. Thus, alternative product-binding modes exist for the PTEs, and it is the bridging mode that appears to result from phosphotriester hydrolysis. Kinetic analysis of the PTE and promiscuous phosphodiesterase activities confirms that the presence of a mu-hydroxo bridge during phosphotriester hydrolysis is correlated with a lower pK(a) for the nucleophile, consistent with a general base function during catalysis. In crystallo capture of a Michaelis complex and product-binding modes of a bacterial phosphotriesterase.,Jackson CJ, Foo JL, Kim HK, Carr PD, Liu JW, Salem G, Ollis DL J Mol Biol. 2008 Feb 1;375(5):1189-96. Epub 2007 Nov 1. PMID:18082180[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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