5ns7: Difference between revisions
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==Crystal structure of beta-glucosidase BglM-G1 mutant H75R from marine metagenome== | ==Crystal structure of beta-glucosidase BglM-G1 mutant H75R from marine metagenome== | ||
<StructureSection load='5ns7' size='340' side='right' caption='[[5ns7]], [[Resolution|resolution]] 1.54Å' scene=''> | <StructureSection load='5ns7' size='340' side='right'caption='[[5ns7]], [[Resolution|resolution]] 1.54Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[5ns7]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Marine_metagenome Marine metagenome]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NS7 OCA]. For a <b>guided tour on the structure components</b> use [http:// | <table><tr><td colspan='2'>[[5ns7]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Marine_metagenome Marine metagenome]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NS7 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5NS7 FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Beta-glucosidase Beta-glucosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.21 3.2.1.21] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Beta-glucosidase Beta-glucosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.21 3.2.1.21] </span></td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http:// | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=5ns7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ns7 OCA], [http://pdbe.org/5ns7 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5ns7 RCSB], [http://www.ebi.ac.uk/pdbsum/5ns7 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5ns7 ProSAT]</span></td></tr> | ||
</table> | </table> | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
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</div> | </div> | ||
<div class="pdbe-citations 5ns7" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 5ns7" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[Beta-glucosidase 3D structures|Beta-glucosidase 3D structures]] | |||
== References == | == References == | ||
<references/> | <references/> | ||
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</StructureSection> | </StructureSection> | ||
[[Category: Beta-glucosidase]] | [[Category: Beta-glucosidase]] | ||
[[Category: Large Structures]] | |||
[[Category: Marine metagenome]] | [[Category: Marine metagenome]] | ||
[[Category: Gasper, R]] | [[Category: Gasper, R]] | ||
Revision as of 11:27, 4 November 2020
Crystal structure of beta-glucosidase BglM-G1 mutant H75R from marine metagenomeCrystal structure of beta-glucosidase BglM-G1 mutant H75R from marine metagenome
Structural highlights
Publication Abstract from PubMedSalt bridges are the strongest electrostatic interactions in proteins. They substantially contribute to a protein's structural stability. Thus, mutations of salt bridges are typically selected against. Here, we report on the evolutionary loss of a highly conserved salt bridge in the GH1 family glycosyl hydrolase BglM-G1. BglM-G1's gene was found in the bacterial metagenome of a temperate, seasonally cold marine habitat. In BglM-G1, arginine 75 is replaced by a histidine. While fully retaining beta-glucosidase activity, BglM-G1 is less heat stable than an H75R variant, in which the salt bridge was artificially re-introduced. However, the K m toward its substrates was lower in wild type, leading to an overall higher catalytic efficiency. Our results indicate that this loss of the salt bridge leads to higher flexibility in BglM-G1's active site, trading structural stability at high temperatures, a trait not needed in a temperate, seasonally cold habitat, for a more effective catalytic activity. Loss of a conserved salt bridge in bacterial glycosyl hydrolase BgIM-G1 improves substrate binding in temperate environments.,Mhaindarkar D, Gasper R, Lupilov N, Hofmann E, Leichert LI Commun Biol. 2018 Oct 17;1:171. doi: 10.1038/s42003-018-0167-7. eCollection 2018. PMID:30345395[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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