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| | <StructureSection load='3w4q' size='340' side='right'caption='[[3w4q]], [[Resolution|resolution]] 1.20Å' scene=''> | | <StructureSection load='3w4q' size='340' side='right'caption='[[3w4q]], [[Resolution|resolution]] 1.20Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3w4q]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Burm1 Burm1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3W4Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3W4Q FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3w4q]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Burkholderia_multivorans_ATCC_17616 Burkholderia multivorans ATCC 17616]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3W4Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3W4Q FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2ov5|2ov5]], [[3w4o|3w4o]], [[3w4p|3w4p]]</div></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.2Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ampC, BMULJ_04828, Bmul_3689, penA ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=395019 BURM1])</td></tr>
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| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Beta-lactamase Beta-lactamase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.2.6 3.5.2.6] </span></td></tr>
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| | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3w4q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3w4q OCA], [https://pdbe.org/3w4q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3w4q RCSB], [https://www.ebi.ac.uk/pdbsum/3w4q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3w4q ProSAT]</span></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=3w4q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3w4q OCA], [https://pdbe.org/3w4q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3w4q RCSB], [https://www.ebi.ac.uk/pdbsum/3w4q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3w4q ProSAT]</span></td></tr> |
| | </table> | | </table> |
| - | <div style="background-color:#fffaf0;">
| + | == Function == |
| - | == Publication Abstract from PubMed == | + | [https://www.uniprot.org/uniprot/A0A0H3KN52_BURM1 A0A0H3KN52_BURM1] |
| - | Burkholderia cepacia complex and Burkholderia pseudomallei are opportunistic human pathogens. Resistance to beta-lactams among Burkholderia spp. is attributable to expression of beta-lactamases (e.g. PenA in B. cepacia complex and PenI in B. pseudomallei). Phylogenetic comparisons reveal that PenA and PenI are highly related. However, the analyses presented here reveal that PenA is an inhibitor-resistant carbapenemase, most similar to KPC-2 (the most clinically significant serine carbapenemase), whereas PenI is an extended spectrum beta-lactamase. PenA hydrolyzes beta-lactams with k(cat) values ranging from 0.38 +/- 0.04 to 460 +/- 46 s(-1) and possesses high k(cat)/k(inact) values of 2000, 1500, and 75 for beta-lactamase inhibitors. PenI demonstrates the highest kcat value for cefotaxime of 9.0 +/- 0.9 s(-1). Crystal structure determination of PenA and PenI reveals important differences that aid in understanding their contrasting phenotypes. Changes in the positioning of conserved catalytic residues (e.g. Lys-73, Ser-130, and Tyr-105) as well as altered anchoring and decreased occupancy of the deacylation water explain the lower k(cat) values of PenI. The crystal structure of PenA with imipenem docked into the active site suggests why this carbapenem is hydrolyzed and the important role of Arg-220, which was functionally confirmed by mutagenesis and biochemical characterization. Conversely, the conformation of Tyr-105 hindered docking of imipenem into the active site of PenI. The structural and biochemical analyses of PenA and PenI provide key insights into the hydrolytic mechanisms of beta-lactamases, which can lead to the rational design of novel agents against these pathogens.
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| - | Insights into beta-lactamases from Burkholderia species, two phylogenetically related yet distinct resistance determinants.,Papp-Wallace KM, Taracila MA, Gatta JA, Ohuchi N, Bonomo RA, Nukaga M J Biol Chem. 2013 Jun 28;288(26):19090-102. doi: 10.1074/jbc.M113.458315. Epub, 2013 May 8. PMID:23658015<ref>PMID:23658015</ref>
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| - | | + | |
| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| - | </div>
| + | |
| - | <div class="pdbe-citations 3w4q" style="background-color:#fffaf0;"></div>
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| | | | |
| | ==See Also== | | ==See Also== |
| | *[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]] | | *[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]] |
| - | == References == | |
| - | <references/> | |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Beta-lactamase]] | + | [[Category: Burkholderia multivorans ATCC 17616]] |
| - | [[Category: Burm1]]
| + | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Bonomo, R A]] | + | [[Category: Bonomo RA]] |
| - | [[Category: Nukaga, M]] | + | [[Category: Nukaga M]] |
| - | [[Category: Ohuchi, N]] | + | [[Category: Ohuchi N]] |
| - | [[Category: Papp-Wallace, K M]] | + | [[Category: Papp-Wallace KM]] |
| - | [[Category: Taracila, M A]] | + | [[Category: Taracila MA]] |
| - | [[Category: Hydrolase]]
| + | |
