1u4n

Crystal Structure Analysis of the M211S/R215L EST2 mutant

spinqualitylabelsall models 1u4n, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1u4n is a 1 chain structure with sequence from Alicyclobacillus acidocaldarius. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.1Å Ligands: SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q7SIG1_ALIAC 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 Esterase 2 (EST2) from the thermophilic eubacterium Alicyclobacillus acidocaldarius is a thermostable serine hydrolase belonging to the H group of the esterase/lipase family. This enzyme hydrolyzes monoacylesters of different acyl-chain length and various compounds with industrial interest. EST2 displays an optimal temperature at 70 degrees C and maximal activity with pNP-esters having acyl-chain bearing from six to eight carbon atoms. EST2 mutants with different substrate specificity were also designed, generated by site-directed mutagenesis, and biochemically characterized. To better define at structural level the enzyme reaction mechanism, a crystallographic analysis of one of these mutants, namely M211S/R215L, was undertaken. Here we report its three-dimensional structure at 2.10A resolution. Structural analysis of the enzyme revealed an unexpected dimer formation as a consequence of a domain-swapping event involving its N-terminal region. This phenomenon was absent in the case of the enzyme bound to an irreversible inhibitor having optimal substrate structural features. A detailed comparison of the enzyme structures before and following binding to this molecule showed a movement of the N-terminal helices resulting from a trans-cis isomerization of the F37-P38 peptide bond. These findings suggest that this carboxylesterase presents two distinct structural arrangements reminiscent of the open and closed forms already reported for lipases. Potential biological implications associated with the observed quaternary reorganization are here discussed in light of the biochemical properties of other lipolytic members of the H group. The crystal structure of an EST2 mutant unveils structural insights on the H group of the carboxylesterase/lipase family.,De Simone G, Menchise V, Alterio V, Mandrich L, Rossi M, Manco G, Pedone C J Mol Biol. 2004 Oct 8;343(1):137-46. PMID:15381425 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Carboxylesterase 3D structures Lipase 3D Structures

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