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| | <StructureSection load='2v20' size='340' side='right'caption='[[2v20]], [[Resolution|resolution]] 1.67Å' scene=''> | | <StructureSection load='2v20' size='340' side='right'caption='[[2v20]], [[Resolution|resolution]] 1.67Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2v20]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2V20 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2V20 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2v20]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2V20 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2V20 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></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]] 1.67Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1axb|1axb]], [[1bt5|1bt5]], [[1btl|1btl]], [[1ck3|1ck3]], [[1erm|1erm]], [[1ero|1ero]], [[1erq|1erq]], [[1esu|1esu]], [[1fqg|1fqg]], [[1jtd|1jtd]], [[1jtg|1jtg]], [[1jvj|1jvj]], [[1jwp|1jwp]], [[1jwv|1jwv]], [[1jwz|1jwz]], [[1lhy|1lhy]], [[1li0|1li0]], [[1li9|1li9]], [[1m40|1m40]], [[1nxy|1nxy]], [[1ny0|1ny0]], [[1nym|1nym]], [[1nyy|1nyy]], [[1pzo|1pzo]], [[1pzp|1pzp]], [[1s0w|1s0w]], [[1tem|1tem]], [[1xpb|1xpb]], [[1xxm|1xxm]], [[1yt4|1yt4]], [[1zg4|1zg4]], [[1zg6|1zg6]], [[2v1z|2v1z]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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'>[https://proteopedia.org/fgij/fg.htm?mol=2v20 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2v20 OCA], [https://pdbe.org/2v20 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2v20 RCSB], [https://www.ebi.ac.uk/pdbsum/2v20 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2v20 ProSAT]</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=2v20 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2v20 OCA], [http://pdbe.org/2v20 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2v20 RCSB], [http://www.ebi.ac.uk/pdbsum/2v20 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2v20 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/BLAT_ECOLX BLAT_ECOLX]] TEM-type are the most prevalent beta-lactamases in enterobacteria; they hydrolyze the beta-lactam bond in susceptible beta-lactam antibiotics, thus conferring resistance to penicillins and cephalosporins. TEM-3 and TEM-4 are capable of hydrolyzing cefotaxime and ceftazidime. TEM-5 is capable of hydrolyzing ceftazidime. TEM-6 is capable of hydrolyzing ceftazidime and aztreonam. TEM-8/CAZ-2, TEM-16/CAZ-7 and TEM-24/CAZ-6 are markedly active against ceftazidime. IRT-4 shows resistance to beta-lactamase inhibitors. | + | [https://www.uniprot.org/uniprot/BLAT_ECOLX BLAT_ECOLX] TEM-type are the most prevalent beta-lactamases in enterobacteria; they hydrolyze the beta-lactam bond in susceptible beta-lactam antibiotics, thus conferring resistance to penicillins and cephalosporins. TEM-3 and TEM-4 are capable of hydrolyzing cefotaxime and ceftazidime. TEM-5 is capable of hydrolyzing ceftazidime. TEM-6 is capable of hydrolyzing ceftazidime and aztreonam. TEM-8/CAZ-2, TEM-16/CAZ-7 and TEM-24/CAZ-6 are markedly active against ceftazidime. IRT-4 shows resistance to beta-lactamase inhibitors. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | <jmolCheckbox> | | <jmolCheckbox> |
| | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/v2/2v20_consurf.spt"</scriptWhenChecked> | | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/v2/2v20_consurf.spt"</scriptWhenChecked> |
| - | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | + | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> |
| | <text>to colour the structure by Evolutionary Conservation</text> | | <text>to colour the structure by Evolutionary Conservation</text> |
| | </jmolCheckbox> | | </jmolCheckbox> |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bacillus coli migula 1895]] | + | [[Category: Escherichia coli]] |
| - | [[Category: Beta-lactamase]]
| + | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Barrios, H]] | + | [[Category: Barrios H]] |
| - | [[Category: Declercq, J P]] | + | [[Category: Declercq JP]] |
| - | [[Category: Evrard, C]] | + | [[Category: Evrard C]] |
| - | [[Category: Fastrez, J]] | + | [[Category: Fastrez J]] |
| - | [[Category: Mathonet, P]] | + | [[Category: Mathonet P]] |
| - | [[Category: Soumillion, P]] | + | [[Category: Soumillion P]] |
| - | [[Category: Allosteric regulation]]
| + | |
| - | [[Category: Antibiotic resistance]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Insertion mutant]]
| + | |
| Structural highlights
Function
BLAT_ECOLX TEM-type are the most prevalent beta-lactamases in enterobacteria; they hydrolyze the beta-lactam bond in susceptible beta-lactam antibiotics, thus conferring resistance to penicillins and cephalosporins. TEM-3 and TEM-4 are capable of hydrolyzing cefotaxime and ceftazidime. TEM-5 is capable of hydrolyzing ceftazidime. TEM-6 is capable of hydrolyzing ceftazidime and aztreonam. TEM-8/CAZ-2, TEM-16/CAZ-7 and TEM-24/CAZ-6 are markedly active against ceftazidime. IRT-4 shows resistance to beta-lactamase inhibitors.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Allosteric regulation of enzyme activity is a remarkable property of many biological catalysts. Up till now, engineering an allosteric regulation into native, unregulated enzymes has been achieved by the creation of hybrid proteins in which a natural receptor, whose conformation is controlled by ligand binding, is inserted into an enzyme structure. Here, we describe a monomeric enzyme, TEM1-beta-lactamase, that features an allosteric aminoglycoside binding site created de novo by directed-evolution methods. beta-Lactamases are highly efficient enzymes involved in the resistance of bacteria against beta-lactam antibiotics, such as penicillin. Aminoglycosides constitute another class of antibiotics that prevent bacterial protein synthesis, and are neither substrates nor ligands of the native beta-lactamases. Here we show that the engineered enzyme is regulated by the binding of kanamycin and other aminoglycosides. Kinetic and structural analyses indicate that the activation mechanism involves expulsion of an inhibitor that binds to an additional, fortuitous site on the engineered protein. These analyses also led to the defining of conditions that allowed an aminoglycoside to be detected at low concentration.
Engineering an Allosteric Binding Site for Aminoglycosides into TEM1-beta-Lactamase.,Volkov AN, Barrios H, Mathonet P, Evrard C, Ubbink M, Declercq JP, Soumillion P, Fastrez J Chembiochem. 2011 Apr 11;12(6):904-13. doi: 10.1002/cbic.201000568. Epub, 2011 Mar 18. PMID:21425229[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Volkov AN, Barrios H, Mathonet P, Evrard C, Ubbink M, Declercq JP, Soumillion P, Fastrez J. Engineering an Allosteric Binding Site for Aminoglycosides into TEM1-beta-Lactamase. Chembiochem. 2011 Apr 11;12(6):904-13. doi: 10.1002/cbic.201000568. Epub, 2011 Mar 18. PMID:21425229 doi:10.1002/cbic.201000568
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