7c23

Crystal structure of CrmE10, a SGNH-hydrolase family esterase

spinqualitylabelsall models 7c23, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7c23 is a 2 chain structure with sequence from Croceicoccus marinus. This structure supersedes the now removed PDB entries 6m41 and 6iq7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: ACT, CA, EDO, IMD Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A1Z1F9L9_9SPHN Publication Abstract from PubMed Background: Esterases and lipases hydrolyze short-chain esters and long-chain triglycerides, respectively, and therefore play essential roles in the synthesis and decomposition of ester bonds in the pharmaceutical and food industries. Many SGNH family esterases share high similarity in sequences. However, they have distinct enzymatic activities toward the same substrates. Due to a lack of structural information, the detailed catalytic mechanisms of these esterases remain barely investigated. Results: In this study, we identified two SGNH family esterases, CrmE10 and AlinE4, from marine bacteria with significantly different preferences for pH, temperature, metal ion, and organic solvent tolerance despite high sequence similarity. The crystal structures of these two esterases, including wild type and mutants, were determined to high resolutions ranging from 1.18 A to 2.24 A. Both CrmE10 and AlinE4 were composed of five beta-strands and nine alpha-helices, which formed one compact N-terminal alpha/beta globular domain and one extended C-terminal domain. The aspartic residues (D178 in CrmE10/D162 in AlinE4) destabilized the conformations of the catalytic triad (Ser-Asp-His) in both esterases, and the metal ion Cd(2+) might reduce enzymatic activity by blocking proton transfer or substrate binding. CrmE10 and AlinE4 showed distinctly different electrostatic surface potentials, despite the similar atomic architectures and a similar swap catalytic mechanism. When five negatively charged residues (Asp or Glu) were mutated to residue Lys, CrmE10 obtained elevated alkaline adaptability and significantly increased the enzymatic activity from 0 to 20% at pH 10.5. Also, CrmE10 mutants exhibited dramatic change for enzymatic properties when compared with the wide-type enzyme. Conclusions: These findings offer a perspective for understanding the catalytic mechanism of different esterases and might facilitate the industrial biocatalytic applications. Structure-guided protein engineering increases enzymatic activities of the SGNH family esterases.,Li Z, Li L, Huo Y, Chen Z, Zhao Y, Huang J, Jian S, Rong Z, Wu D, Gan J, Hu X, Li J, Xu XW Biotechnol Biofuels. 2020 Jun 15;13:107. doi: 10.1186/s13068-020-01742-8., eCollection 2020. PMID:32549911 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Carboxylesterase 3D structures

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