View source for 6mpq


==1.95 Ang crystal structure of OXA-24/40 beta-lactamase in complex the inhibitor ETX2514==
<StructureSection load='6mpq' size='340' side='right'caption='[[6mpq]], [[Resolution|resolution]] 1.95&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6mpq]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Acinetobacter_baumannii Acinetobacter baumannii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6MPQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6MPQ 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]] 1.95&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=JXG:(2S,5R)-1-formyl-3-methyl-5-[(sulfooxy)amino]-1,2,5,6-tetrahydropyridine-2-carboxamide'>JXG</scene>, <scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</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=6mpq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6mpq OCA], [https://pdbe.org/6mpq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6mpq RCSB], [https://www.ebi.ac.uk/pdbsum/6mpq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6mpq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q8RLA6_ACIBA Q8RLA6_ACIBA] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Multidrug-resistant (MDR) Acinetobacter spp. poses a significant therapeutic challenge in part due to the presence of chromosomally encoded beta-lactamases, including class C Acinetobacter-derived cephalosporinases (ADC) and class D oxacillinases (OXA), as well as plasmid-mediated class A beta-lactamases. Importantly, OXA-like beta-lactamases represent a gap in the spectrum of inhibition by recently approved beta-lactamase inhibitors such as avibactam and vaborbactam. ETX2514 is a novel, rationally designed, diazabicyclooctenone inhibitor that effectively targets class A, C, and D beta-lactamases. We show that addition of ETX2514 significantly increased the susceptibility of clinical Acinetobacter baumannii isolates to sulbactam. AdeB and AdeJ were identified to be key efflux constituents for ETX2514 in A. baumannii The combination of sulbactam and ETX2514 was efficacious against A. baumannii carrying bla TEM-1, bla ADC-82, bla OXA-23, and bla OXA-66 in a neutropenic murine thigh infection model. We also show that, in vitro, ETX2514 inhibited ADC-7 (k 2/Ki 1.0 +/- 0.1 x 10(6) M(-1) s(-1)) and OXA-58 (k 2/Ki 2.5 +/- 0.3 x 10(5) M(-1) s(-1)). Cocrystallization of ETX2514 with OXA-24/40 revealed hydrogen bonding interactions between ETX2514 and residues R261, S219, and S128 of OXA-24/40 in addition to a chloride ion occupied in the active site. Further, the C3 methyl group of ETX2514 shifts the position of M223. In conclusion, the sulbactam-ETX2514 combination possesses a broadened inhibitory range to include class D beta-lactamases as well as class A and C beta-lactamases and is a promising therapeutic candidate for infections caused by MDR Acinetobacter spp.IMPORTANCE The number and diversity of beta-lactamases are steadily increasing. The emergence of beta-lactamases that hydrolyze carbapenems poses a significant threat to our antibiotic armamentarium. The explosion of OXA enzymes that are carbapenem hydrolyzers is a major challenge (carbapenem-hydrolyzing class D [CHD]). An urgent need exists to discover beta-lactamase inhibitors with class D activity. The sulbactam-ETX2514 combination demonstrates the potential to become a treatment regimen of choice for Acinetobacter spp. producing class D beta-lactamases.

Targeting Multidrug-Resistant Acinetobacter spp.: Sulbactam and the Diazabicyclooctenone beta-Lactamase Inhibitor ETX2514 as a Novel Therapeutic Agent.,Barnes MD, Kumar V, Bethel CR, Moussa SH, O'Donnell J, Rutter JD, Good CE, Hujer KM, Hujer AM, Marshall SH, Kreiswirth BN, Richter SS, Rather PN, Jacobs MR, Papp-Wallace KM, van den Akker F, Bonomo RA MBio. 2019 Mar 12;10(2). pii: mBio.00159-19. doi: 10.1128/mBio.00159-19. PMID:30862744<ref>PMID:30862744</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6mpq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Acinetobacter baumannii]]
[[Category: Large Structures]]
[[Category: Kumar V]]
[[Category: Van den Akker F]]