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4f6z

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<StructureSection load='4f6z' size='340' side='right'caption='[[4f6z]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
<StructureSection load='4f6z' size='340' side='right'caption='[[4f6z]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[4f6z]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_aeruginosus"_(schroeter_1872)_trevisan_1885 "bacillus aeruginosus" (schroeter 1872) trevisan 1885]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4F6Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4F6Z FirstGlance]. <br>
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<table><tr><td colspan='2'>[[4f6z]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4F6Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4F6Z FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FLC:CITRATE+ANION'>FLC</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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</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&#8491;</td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[4f6h|4f6h]]</div></td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FLC:CITRATE+ANION'>FLC</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">blaIMP-1, bla IMP, bla-imp, blaESP, imp ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=287 "Bacillus aeruginosus" (Schroeter 1872) Trevisan 1885])</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=4f6z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4f6z OCA], [https://pdbe.org/4f6z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4f6z RCSB], [https://www.ebi.ac.uk/pdbsum/4f6z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4f6z 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=4f6z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4f6z OCA], [https://pdbe.org/4f6z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4f6z RCSB], [https://www.ebi.ac.uk/pdbsum/4f6z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4f6z ProSAT]</span></td></tr>
</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/Q79MP6_PSEAI Q79MP6_PSEAI]
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Metallo-beta-lactamases catalyze the hydrolysis of a broad range of beta-lactam antibiotics and are a concern for the spread of drug resistance. To analyze the determinants of enzyme structure and function, the sequence requirements for the subclass B1 IMP-1 beta-lactamase zinc binding residue Cys221 were tested by saturation mutagenesis and evaluated for protein expression, as well as hydrolysis of beta-lactam substrates. The results indicated that most substitutions at position 221 destabilized the enzyme. Only the enzymes containing C221D and C221G substitutions were expressed well in Escherichia coli and exhibited catalytic activity toward beta-lactam antibiotics. Despite the lack of a metal-chelating group at position 221, the C221G enzyme exhibited high levels of catalytic activity in the presence of exogenous zinc. Molecular modeling suggests the glycine substitution is unique among substitutions in that the complete removal of the cysteine side chain allows space for a water molecule to replace the thiol and coordinate zinc at the Zn2 zinc binding site to restore function. Multiple methods were used to estimate the C221G Zn2 binding constant to be 17 to 43 muM. Studies of enzyme function in vivo in E. coli grown on minimal medium showed that both IMP-1 and the C221G mutant exhibited compromised activity when zinc availability was low. Finally, substitutions at residue 121, which is the IMP-1 equivalent of the subclass B3 zinc-chelating position, failed to rescue C221G function, suggesting the coordination schemes of subclasses B1 and B3 are not interchangeable.
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Mutagenesis of zinc ligand residue Cys221 reveals plasticity in the IMP-1 metallo-beta-lactamase active site.,Horton LB, Shanker S, Mikulski R, Brown NG, Phillips KJ, Lykissa E, Venkataram Prasad BV, Palzkill T Antimicrob Agents Chemother. 2012 Nov;56(11):5667-77. doi: 10.1128/AAC.01276-12. , Epub 2012 Aug 20. PMID:22908171<ref>PMID:22908171</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 4f6z" 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]]
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== References ==
 
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<references/>
 
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
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[[Category: Brown, N G]]
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[[Category: Pseudomonas aeruginosa]]
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[[Category: Horton, L B]]
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[[Category: Brown NG]]
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[[Category: Lykissa, E]]
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[[Category: Horton LB]]
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[[Category: Mikulski, R]]
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[[Category: Lykissa E]]
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[[Category: Palzkill, T G]]
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[[Category: Mikulski R]]
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[[Category: Phillips, K]]
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[[Category: Palzkill TG]]
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[[Category: Prasad, B V.V]]
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[[Category: Phillips K]]
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[[Category: Sankaran, B]]
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[[Category: Prasad BVV]]
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[[Category: Shanker, S]]
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[[Category: Sankaran B]]
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[[Category: B-lactamase]]
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[[Category: Shanker S]]
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[[Category: Hydrolase]]
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[[Category: Metallo-b-lactamase]]
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Current revision

Mutagenesis of zinc ligand residue Cys221 reveals plasticity in the IMP-1 metallo-b-lactamase active site

PDB ID 4f6z

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