3hwp | pdb_00003hwp

Crystal structure and computational analyses provide insights into the catalytic mechanism of 2, 4-diacetylphloroglucinol hydrolase PhlG from Pseudomonas fluorescens

spinqualitylabelsall models 3hwp, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hwp is a 2 chain structure with sequence from Psef5. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, NI, ZN NonStd Res: MSE Gene: PhlG (PSEF5) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 2,4-Diacetylphloroglucinol hydrolase PhlG from Pseudomonas fluorescens catalyzes hydrolytic carbon-carbon (C-C) bond cleavage of the antibiotic 2,4-diacetylphloroglucinol to form monoacetylphloroglucinol, a rare class of reactions in chemistry and biochemistry. To investigate the catalytic mechanism of this enzyme, we determined the three-dimensional structure of PhlG at 2.0 A resolution using x-ray crystallography and MAD methods. The overall structure includes a small N-terminal domain mainly involved in dimerization and a C-terminal domain of Bet v1-like fold, which distinguishes PhlG from the classical alpha/beta-fold hydrolases. A dumbbell-shaped substrate access tunnel was identified to connect a narrow interior amphiphilic pocket to the exterior solvent. The tunnel is likely to undergo a significant conformational change upon substrate binding to the active site. Structural analysis coupled with computational docking studies, site-directed mutagenesis, and enzyme activity analysis revealed that cleavage of the 2,4-diacetylphloroglucinol C-C bond proceeds via nucleophilic attack by a water molecule, which is coordinated by a zinc ion. In addition, residues Tyr(121), Tyr(229), and Asn(132), which are predicted to be hydrogen-bonded to the hydroxyl groups and unhydrolyzed acetyl group, can finely tune and position the bound substrate in a reactive orientation. Taken together, these results revealed the active sites and zinc-dependent hydrolytic mechanism of PhlG and explained its substrate specificity as well. Crystal structure and computational analyses provide insights into the catalytic mechanism of 2,4-diacetylphloroglucinol hydrolase PhlG from Pseudomonas fluorescens.,He YX, Huang L, Xue Y, Fei X, Teng YB, Rubin-Pitel SB, Zhao H, Zhou CZ J Biol Chem. 2010 Feb 12;285(7):4603-11. Epub 2009 Dec 16. PMID:20018877 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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