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1bc2

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[[Image:1bc2.gif|left|200px]]<br /><applet load="1bc2" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1bc2, resolution 1.9&Aring;" />
 
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'''ZN-DEPENDENT METALLO-BETA-LACTAMASE FROM BACILLUS CEREUS'''<br />
 
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==Overview==
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==ZN-DEPENDENT METALLO-BETA-LACTAMASE FROM BACILLUS CEREUS==
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The structure of the zinc-dependent beta-lactamase II from Bacillus cereus has been determined at 1.9 A resolution in a crystal form with two molecules in the asymmetric unit and 400 waters (space group P3121; Rcryst = 20.8%). The active site contains two zinc ions: Zn1 is tightly coordinated by His86, His88, and His149, while Zn2 is loosely coordinated by Asp90, Cys168, and His210. A water molecule (W1) lies between the two zinc ions but is significantly closer to Zn1 and at a distance of only 1.9 A is effectively a hydroxide moiety and a potential, preactivated nucleophile. In fact, Asp90 bridges W1 to Zn2, and its location is thus distinct from that of the bridging water molecules in the binuclear zinc peptidases or other binuclear zinc hydrolases. Modeling of penicillin, cephalosporin, and carbapenem binding shows that all are readily accommodated within the shallow active site cleft of the enzyme, and the Zn1-bound hydroxide is ideally located for nucleophilic attack at the beta-lactam carbonyl. This enzyme also functions with only one zinc ion present. The Zn1-Zn2 distances differ in the two independent molecules in the crystal (3.9 and 4.4 A), yet the Zn1-W1 distances are both 1.9 A, arguing against involvement of Zn2 in W1 activation. The role of Zn2 is unclear, but the B. cereus enzyme may be an evolutionary intermediate between the mono- and bizinc metallo-beta-lactamases. The broad specificity of this enzyme, together with the increasing prevalence of zinc-dependent metallo-beta-lactamases, poses a real clinical threat, and this structure provides a basis for understanding its mechanism and designing inhibitors.
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<StructureSection load='1bc2' size='340' side='right'caption='[[1bc2]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1bc2]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_cereus Bacillus cereus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BC2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BC2 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]] 1.9&#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=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=1bc2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bc2 OCA], [https://pdbe.org/1bc2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bc2 RCSB], [https://www.ebi.ac.uk/pdbsum/1bc2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bc2 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/BLA2_BACCE BLA2_BACCE] Can hydrolyze carbapenem compounds.
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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/bc/1bc2_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=1bc2 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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1BC2 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_cereus Bacillus cereus] with <scene name='pdbligand=ZN:'>ZN</scene> and <scene name='pdbligand=SO4:'>SO4</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] Known structural/functional Sites: <scene name='pdbsite=ASA:Strained+Buried+Residue,+Close+To+Active+Site+In+Molecule+A'>ASA</scene>, <scene name='pdbsite=ASB:Strained+Buried+Residue,+Close+To+Active+Site+In+Molecule+B'>ASB</scene>, <scene name='pdbsite=ZNA:Zn+Binding+Sites+And+Active+Site+For+Molecule+A'>ZNA</scene> and <scene name='pdbsite=ZNB:Zn+Binding+Sites+And+Active+Site+For+Molecule+B'>ZNB</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BC2 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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Crystal structure of the zinc-dependent beta-lactamase from Bacillus cereus at 1.9 A resolution: binuclear active site with features of a mononuclear enzyme., Fabiane SM, Sohi MK, Wan T, Payne DJ, Bateson JH, Mitchell T, Sutton BJ, Biochemistry. 1998 Sep 8;37(36):12404-11. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9730812 9730812]
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[[Category: Bacillus cereus]]
[[Category: Bacillus cereus]]
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[[Category: Beta-lactamase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Fabiane SM]]
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[[Category: Fabiane, S M.]]
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[[Category: Sutton BJ]]
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[[Category: Sutton, B J.]]
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[[Category: SO4]]
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[[Category: ZN]]
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[[Category: antibiotic resistance]]
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[[Category: hydrolase]]
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[[Category: metallo beta-lactamase]]
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[[Category: penicillinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 11:53:41 2008''
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ZN-DEPENDENT METALLO-BETA-LACTAMASE FROM BACILLUS CEREUS

PDB ID 1bc2

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