1axb

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{{Seed}}
 
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[[Image:1axb.png|left|200px]]
 
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==TEM-1 BETA-LACTAMASE FROM ESCHERICHIA COLI INHIBITED WITH AN ACYLATION TRANSITION STATE ANALOG==
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The line below this paragraph, containing "STRUCTURE_1axb", creates the "Structure Box" on the page.
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<StructureSection load='1axb' size='340' side='right'caption='[[1axb]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1axb]] 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=1AXB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AXB FirstGlance]. <br>
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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='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FOS:[[N-(BENZYLOXYCARBONYL)AMINO]METHYL]PHOSPHATE'>FOS</scene></td></tr>
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{{STRUCTURE_1axb| PDB=1axb | SCENE= }}
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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=1axb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1axb OCA], [https://pdbe.org/1axb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1axb RCSB], [https://www.ebi.ac.uk/pdbsum/1axb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1axb ProSAT]</span></td></tr>
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</table>
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== Function ==
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[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.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ax/1axb_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1axb ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The crystal structure of a phosphonate complex of the class A TEM-1 beta-lactamase has been determined to a resolution of 2.0 A. The phosphonate appears stoichiometrically at the active site, bound covalently to Ser70Ogamma, with one phosphonyl oxygen in the oxyanion hole. Although the overall structure is very similar to that of the native enzyme (rms difference 0.37 A for all heavy atoms), changes have occurred in the position of active site functional groups. The active site is also not in the conformation observed in the complex of another class A beta-lactamase, that of Staphylococcus aureus PC1, with the same phosphonate [Chen, C. C. H., et al. (1993) J. Mol. Biol. 234,165-178]. Both phosphonate structures, however, can be seen to represent models of acylation transition-states since in each the deacylating water molecule appears firmly bound to the Glu166 carboxylate group. The major difference between the structures lies in the positioning of Lys73Nzeta and Ser130Ogamma. In the S. aureus structure, the closest interaction of these functional groups is between Lys73Nzeta and Ser70Ogamma (2.8 A), while in the TEM-1 structure it is between Ser130Ogamma and the second phosphonyl oxygen of the bound inhibitor (2.8 A). The former structure therefore may resemble a transition state for formation of the tetrahedral species in acylation by nucleophilic attack on the substrate, where Lys73Nzeta presumably catalyzes the reaction as a general base. The TEM-1 structure can then be seen as an analogue of the transition state for breakdown of the tetrahedral species, where Ser130Ogamma is acting as a general acid, assisting the departure of the leaving group. The class A beta-lactamase crystal structures now available lead to a self-consistent proposal for a mechanism of catalysis by these enzymes.
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===TEM-1 BETA-LACTAMASE FROM ESCHERICHIA COLI INHIBITED WITH AN ACYLATION TRANSITION STATE ANALOG===
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Crystal structure of an acylation transition-state analog of the TEM-1 beta-lactamase. Mechanistic implications for class A beta-lactamases.,Maveyraud L, Pratt RF, Samama JP Biochemistry. 1998 Feb 24;37(8):2622-8. PMID:9485412<ref>PMID:9485412</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 1axb" style="background-color:#fffaf0;"></div>
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==See Also==
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The line below this paragraph, {{ABSTRACT_PUBMED_9485412}}, adds the Publication Abstract to the page
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*[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]]
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(as it appears on PubMed at http://www.pubmed.gov), where 9485412 is the PubMed ID number.
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== References ==
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<references/>
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{{ABSTRACT_PUBMED_9485412}}
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__TOC__
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</StructureSection>
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==About this Structure==
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1AXB is a 1 chain structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AXB OCA].
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==Reference==
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<ref group="xtra">PMID:9485412</ref><references group="xtra"/>
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[[Category: Beta-lactamase]]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Maveyraud, L.]]
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[[Category: Large Structures]]
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[[Category: Pratt, R F.]]
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[[Category: Maveyraud L]]
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[[Category: Samama, J P.]]
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[[Category: Pratt RF]]
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[[Category: Antibiotic resistance]]
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[[Category: Samama JP]]
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[[Category: Beta-lactamase]]
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[[Category: Hydrolase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Feb 17 04:01:23 2009''
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Current revision

TEM-1 BETA-LACTAMASE FROM ESCHERICHIA COLI INHIBITED WITH AN ACYLATION TRANSITION STATE ANALOG

PDB ID 1axb

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