View source for 4jf6


==Structure of OXA-23 at pH 7.0==
<StructureSection load='4jf6' size='340' side='right'caption='[[4jf6]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4jf6]] 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=4JF6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4JF6 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]] 2.5&#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=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</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=4jf6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4jf6 OCA], [https://pdbe.org/4jf6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4jf6 RCSB], [https://www.ebi.ac.uk/pdbsum/4jf6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4jf6 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/BLO23_ACIBA BLO23_ACIBA] Class D beta-lactamase which confers resistance to the beta-lactam antibiotics, including ampicillin, and carbapenems such as imipenem and meropenem (PubMed:18725452, PubMed:20194701, PubMed:24012371, PubMed:30530607, PubMed:35420470). Acts via hydrolysis of the beta-lactam ring (PubMed:23877677, PubMed:24012371, PubMed:30530607, PubMed:35420470). Has penicillin-, cephalosporin- and carbapenem-hydrolyzing activities, but lacks ceftazidime-hydrolyzing activity (PubMed:23877677, PubMed:24012371, PubMed:30530607, PubMed:35420470).<ref>PMID:18725452</ref> <ref>PMID:20194701</ref> <ref>PMID:23877677</ref> <ref>PMID:24012371</ref> <ref>PMID:30530607</ref> <ref>PMID:35420470</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Dissemination of Acinetobacter baumannii strains harboring class D beta-lactamases producing resistance to carbapenem antibiotics severely limits our ability to treat deadly Acinetobacter infections. Susceptibility determination in the A. baumannii background and kinetic studies with a homogeneous preparation of OXA-23 beta-lactamase, the major carbapenemase present in A. baumannii, document the ability of this enzyme to manifest resistance to last-resort carbapenem antibiotics. We also report three X-ray structures of OXA-23: apo OXA-23 at two different pH values, and wild-type OXA-23 in complex with meropenem, a carbapenem substrate. The structures and dynamics simulations reveal an important role for Leu166, whose motion regulates the access of a hydrolytic water molecule to the acyl-enzyme species in imparting carbapenemase activity.

Structural Basis for Carbapenemase Activity of the OXA-23 beta-Lactamase from Acinetobacter baumannii.,Smith CA, Antunes NT, Stewart NK, Toth M, Kumarasiri M, Chang M, Mobashery S, Vakulenko SB Chem Biol. 2013 Sep 19;20(9):1107-15. doi: 10.1016/j.chembiol.2013.07.015. Epub, 2013 Sep 5. PMID:24012371<ref>PMID:24012371</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4jf6" 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: Smith CA]]
[[Category: Vakulenko SB]]