1dpm
From Proteopedia
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|PDB= 1dpm |SIZE=350|CAPTION= <scene name='initialview01'>1dpm</scene>, resolution 2.1Å | |PDB= 1dpm |SIZE=350|CAPTION= <scene name='initialview01'>1dpm</scene>, resolution 2.1Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand= | + | |LIGAND= <scene name='pdbligand=EBP:DIETHYL+4-METHYLBENZYLPHOSPHONATE'>EBP</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1dpm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dpm OCA], [http://www.ebi.ac.uk/pdbsum/1dpm PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1dpm RCSB]</span> | ||
}} | }} | ||
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[[Category: Raushel, F M.]] | [[Category: Raushel, F M.]] | ||
[[Category: Vanhooke, J L.]] | [[Category: Vanhooke, J L.]] | ||
| - | [[Category: EBP]] | ||
| - | [[Category: FMT]] | ||
| - | [[Category: ZN]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
[[Category: membrane]] | [[Category: membrane]] | ||
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[[Category: zinc]] | [[Category: zinc]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:46:08 2008'' |
Revision as of 16:46, 30 March 2008
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| , resolution 2.1Å | |||||||
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| Ligands: | , , | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
THREE-DIMENSIONAL STRUCTURE OF THE ZINC-CONTAINING PHOSPHOTRIESTERASE WITH BOUND SUBSTRATE ANALOG DIETHYL 4-METHYLBENZYLPHOSPHONATE
Overview
Phosphotriesterase from Pseudomonas diminuta catalyzes the hydrolysis of paraoxon and related acetylcholinesterase inhibitors with rate enhancements that approach 10(12). The enzyme requires a binuclear metal center for activity and as isolated contains 2 equiv of zinc per subunit. Here we describe the three-dimensional structure of the Zn2+/Zn2+-substituted enzyme complexed with the substrate analog diethyl 4-methylbenzylphosphonate. Crystals employed in the investigation belonged to the space group C2 with unit cell dimensions of a = 129.6 A, b = 91.4 A, c = 69.4 A, beta = 91.9 degrees, and two subunits in the asymmetric unit. The model was refined by least-squares analysis to a nominal resolution of 2.1 A and a crystallographic R-factor of 15.4% for all measured X-ray data. As in the previously reported structure of the cadmium-containing enzyme, the bridging ligands are a carbamylated lysine residue (Lys 169) and a hydroxide. The zinc ions are separated by 3.3 A. The more buried zinc ion is surrounded by His 55, His 57, Lys 169, Asp 301, and the bridging hydroxide in a trigonal bipyramidal arrangement as described for the cadmium-substituted enzyme. Unlike the octahedral coordination observed for the more solvent-exposed cadmium ion, however, the second zinc is tetrahedrally ligated to Lys 169, His 201, His 230, and the bridging hydroxide. The diethyl 4-methylbenzylphosphonate occupies a site near the binuclear metal center with the phosphoryl oxygen of the substrate analog situated at 3.5 A from the more solvent-exposed zinc ion. The aromatic portion of the inhibitor binds in a fairly hydrophobic pocket. A striking feature of the active site pocket is the lack of direct electrostatic interactions between the inhibitor and the protein. This most likely explains the broad substrate specificity exhibited by phosphotriesterase. The position of the inhibitor within the active site suggests that the nucleophile for the hydrolysis reaction is the metal-bound hydroxide.
About this Structure
1DPM is a Single protein structure of sequence from Brevundimonas diminuta. Full crystallographic information is available from OCA.
Reference
Three-dimensional structure of the zinc-containing phosphotriesterase with the bound substrate analog diethyl 4-methylbenzylphosphonate., Vanhooke JL, Benning MM, Raushel FM, Holden HM, Biochemistry. 1996 May 14;35(19):6020-5. PMID:8634243
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