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==Crystal structure of the class B3 di-zinc metallo-beta-lactamase LRA- 12 from an Alaskan soil metagenome.== | |||
<StructureSection load='5aeb' size='340' side='right' caption='[[5aeb]], [[Resolution|resolution]] 2.10Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5aeb]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Uncultured_bacterium_blr12 Uncultured bacterium blr12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5AEB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5AEB FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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-lactamase Beta-lactamase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.2.6 3.5.2.6] </span></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5aeb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5aeb OCA], [http://pdbe.org/5aeb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5aeb RCSB], [http://www.ebi.ac.uk/pdbsum/5aeb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5aeb ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
We analyzed the kinetic properties of the metagenomic class B3 beta-lactamase LRA-12, and determined its crystallographic structure in order to compare it with prevalent metallo-beta-lactamases (MBLs) associated with clinical pathogens. We showed that LRA-12 confers extended-spectrum resistance on E. coli when expressed from recombinant clones, and the MIC values for carbapenems were similar to those observed in enterobacteria expressing plasmid-borne MBLs such as VIM, IMP or NDM. This was in agreement with the strong carbapenemase activity displayed by LRA-12, similar to GOB beta-lactamases. Among the chelating agents evaluated, dipicolinic acid inhibited the enzyme more strongly than EDTA, which required pre-incubation with the enzyme to achieve measurable inhibition. Structurally, LRA-12 contains the conserved main structural features of di-zinc class B beta-lactamases, and presents unique structural signatures that differentiate this enzyme from others within the family: (i) two loops (alpha3-beta7 and beta11-alpha5) that could influence antibiotic entrance and remodeling of the active site cavity; (ii) a voluminous catalytic cavity probably responsible for the high hydrolytic efficiency of the enzyme; (iii) the absence of disulfide bridges; (iv) a unique Gln116 at metal-binding site 1; (v) a methionine residue at position 221that replaces Cys/Ser found in other B3 beta-lactamases in a predominantly hydrophobic environment, likely playing a role in protein stability. The structure of LRA-12 indicates that MBLs exist in wild microbial populations in extreme environments, or environments with low anthropic impact, and under the appropriate antibiotic selective pressure could be captured and disseminated to pathogens. | |||
Crystal structure and kinetic analysis of the class B3 di-zinc metallo-beta-lactamase LRA-12 from an Alaskan soil metagenome.,Rodriguez MM, Herman R, Ghiglione B, Kerff F, D'Amico Gonzalez G, Bouillenne F, Galleni M, Handelsman J, Charlier P, Gutkind G, Sauvage E, Power P PLoS One. 2017 Jul 27;12(7):e0182043. doi: 10.1371/journal.pone.0182043., eCollection 2017. PMID:28750094<ref>PMID:28750094</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 5aeb" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Beta-lactamase]] | |||
[[Category: Uncultured bacterium blr12]] | |||
[[Category: Bouillenne, F]] | |||
[[Category: Charlier, P]] | |||
[[Category: Galleni, M]] | |||
[[Category: Gutkind, G]] | [[Category: Gutkind, G]] | ||
[[Category: | [[Category: Handelsman, J]] | ||
[[Category: Herman, R]] | [[Category: Herman, R]] | ||
[[Category: Kerff, F]] | [[Category: Kerff, F]] | ||
[[Category: | [[Category: Power, P]] | ||
[[Category: | [[Category: Rodriguez, M M]] | ||
[[Category: Sauvage, E]] | [[Category: Sauvage, E]] | ||
[[Category: | [[Category: Carbapenem-resistance]] | ||
[[Category: | [[Category: Carbapenemase]] | ||
[[Category: | [[Category: Environmental resistome]] | ||
[[Category: Hydrolase]] | |||
[[Category: Mbl]] | |||
[[Category: Metagenomic]] | |||
Revision as of 12:03, 9 August 2017
Crystal structure of the class B3 di-zinc metallo-beta-lactamase LRA- 12 from an Alaskan soil metagenome.Crystal structure of the class B3 di-zinc metallo-beta-lactamase LRA- 12 from an Alaskan soil metagenome.
Structural highlights
Publication Abstract from PubMedWe analyzed the kinetic properties of the metagenomic class B3 beta-lactamase LRA-12, and determined its crystallographic structure in order to compare it with prevalent metallo-beta-lactamases (MBLs) associated with clinical pathogens. We showed that LRA-12 confers extended-spectrum resistance on E. coli when expressed from recombinant clones, and the MIC values for carbapenems were similar to those observed in enterobacteria expressing plasmid-borne MBLs such as VIM, IMP or NDM. This was in agreement with the strong carbapenemase activity displayed by LRA-12, similar to GOB beta-lactamases. Among the chelating agents evaluated, dipicolinic acid inhibited the enzyme more strongly than EDTA, which required pre-incubation with the enzyme to achieve measurable inhibition. Structurally, LRA-12 contains the conserved main structural features of di-zinc class B beta-lactamases, and presents unique structural signatures that differentiate this enzyme from others within the family: (i) two loops (alpha3-beta7 and beta11-alpha5) that could influence antibiotic entrance and remodeling of the active site cavity; (ii) a voluminous catalytic cavity probably responsible for the high hydrolytic efficiency of the enzyme; (iii) the absence of disulfide bridges; (iv) a unique Gln116 at metal-binding site 1; (v) a methionine residue at position 221that replaces Cys/Ser found in other B3 beta-lactamases in a predominantly hydrophobic environment, likely playing a role in protein stability. The structure of LRA-12 indicates that MBLs exist in wild microbial populations in extreme environments, or environments with low anthropic impact, and under the appropriate antibiotic selective pressure could be captured and disseminated to pathogens. Crystal structure and kinetic analysis of the class B3 di-zinc metallo-beta-lactamase LRA-12 from an Alaskan soil metagenome.,Rodriguez MM, Herman R, Ghiglione B, Kerff F, D'Amico Gonzalez G, Bouillenne F, Galleni M, Handelsman J, Charlier P, Gutkind G, Sauvage E, Power P PLoS One. 2017 Jul 27;12(7):e0182043. doi: 10.1371/journal.pone.0182043., eCollection 2017. PMID:28750094[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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