View source for 7c23


==Crystal structure of CrmE10, a SGNH-hydrolase family esterase==
<StructureSection load='7c23' size='340' side='right'caption='[[7c23]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7c23]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Croceicoccus_marinus Croceicoccus marinus]. This structure supersedes the now removed PDB entries [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=6m41 6m41] and [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=6iq7 6iq7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7C23 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7C23 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]] 1.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</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=7c23 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7c23 OCA], [https://pdbe.org/7c23 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7c23 RCSB], [https://www.ebi.ac.uk/pdbsum/7c23 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7c23 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A1Z1F9L9_9SPHN A0A1Z1F9L9_9SPHN] 
<div style="background-color:#fffaf0;">
== 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<ref>PMID:32549911</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7c23" style="background-color:#fffaf0;"></div>

==See Also==
*[[Carboxylesterase 3D structures|Carboxylesterase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Croceicoccus marinus]]
[[Category: Large Structures]]
[[Category: Li J]]
[[Category: Li Z]]