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1blc

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[[Image:1blc.gif|left|200px]]<br /><applet load="1blc" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1blc, resolution 2.2&Aring;" />
 
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'''INHIBITION OF BETA-LACTAMASE BY CLAVULANATE: TRAPPED INTERMEDIATES IN CRYOCRYSTALLOGRAPHIC STUDIES'''<br />
 
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==Overview==
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==INHIBITION OF BETA-LACTAMASE BY CLAVULANATE: TRAPPED INTERMEDIATES IN CRYOCRYSTALLOGRAPHIC STUDIES==
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Crystallographic studies of the complex between beta-lactamase and clavulanate reveal a structure of two acyl-enzymes with covalent bonds at the active site Ser70, representing two different stages of inhibitor degradation alternately occupying the active site. Models that are consistent with biochemical data are derived from the electron density map and refined at 2.2 A resolution: cis enamine, in which the carboxylate group of the clavulanate molecule makes a salt bridge with Lys234 of beta-lactamase; decarboxylated trans enamine, which is oriented away from Lys234. For both acyl-enzymes, the carbonyl oxygen atom of the ester group occupies the oxyanion hole in a manner similar to that found in inhibitor binding to serine proteases. Whereas the oxygen atom in the trans product is optimally positioned in the oxyanion hole, that of the cis product clashes with the main-chain nitrogen atom of Ser70 and the beta-carbon atom of the adjacent Ala69. In contrast to cis to trans isomerization in solution that relieves the steric strain inherent in a cis double bond, at the enzyme-inhibitor interface two additional factors play an important role. The salt bridge enhances the stability of the cis product, while the steric strain introduced by the short contacts with the protein reduces its stability.
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<StructureSection load='1blc' size='340' side='right'caption='[[1blc]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1blc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BLC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BLC 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]] 2.2&#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=CEM:N-(1-CARBOXY-2-HYDROXY-4-OXO-BUTYL)-N-(3-OXO-CISPROPENYL)AMINE'>CEM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TEM:N-(2-HYDROXY-4-OXO-BUTYL)-N-(3-OXO-TRANSPROPENYL)AMINE'>TEM</scene></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=1blc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1blc OCA], [https://pdbe.org/1blc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1blc RCSB], [https://www.ebi.ac.uk/pdbsum/1blc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1blc ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/BLAC_STAAU BLAC_STAAU]
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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/bl/1blc_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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=1blc ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1BLC is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus] with <scene name='pdbligand=SO4:'>SO4</scene> and <scene name='pdbligand=CEM:'>CEM</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BLC OCA].
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*[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Inhibition of beta-lactamase by clavulanate. Trapped intermediates in cryocrystallographic studies., Chen CC, Herzberg O, J Mol Biol. 1992 Apr 20;224(4):1103-13. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=1569569 1569569]
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[[Category: Large Structures]]
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[[Category: Beta-lactamase]]
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[[Category: Single protein]]
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[[Category: Staphylococcus aureus]]
[[Category: Staphylococcus aureus]]
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[[Category: Chen, C C.H.]]
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[[Category: Chen CCH]]
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[[Category: Herzberg, O.]]
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[[Category: Herzberg O]]
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[[Category: CEM]]
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[[Category: SO4]]
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[[Category: hydrolase(acting in cyclic amides)]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 11:56:33 2008''
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Current revision

INHIBITION OF BETA-LACTAMASE BY CLAVULANATE: TRAPPED INTERMEDIATES IN CRYOCRYSTALLOGRAPHIC STUDIES

PDB ID 1blc

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