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1m6k

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(New page: 200px<br /><applet load="1m6k" size="450" color="white" frame="true" align="right" spinBox="true" caption="1m6k, resolution 1.50&Aring;" /> '''Structure of the OXA...)
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[[Image:1m6k.jpg|left|200px]]<br /><applet load="1m6k" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1m6k, resolution 1.50&Aring;" />
 
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'''Structure of the OXA-1 class D beta-lactamase'''<br />
 
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==Overview==
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==Structure of the OXA-1 class D beta-lactamase==
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The crystallographic structure of the Escherichia coli OXA-1, beta-lactamase has been established at 1.5-A resolution and refined to R =, 0.18. The 28.2-kD oxacillinase is a class D serine beta-lactamase that is, especially active against the penicillin-type beta-lactams oxacillin and, cloxacillin. In contrast to the structures of OXA-2, OXA-10, and OXA-13, belonging to other subclasses, the OXA-1 molecule is monomeric rather than, dimeric and represents the subclass characterized by an enlarged Omega, loop near the beta-lactam binding site. The 6-residue hydrophilic, insertion in this loop cannot interact directly with substrates and, instead, projects into solvent. In this structure at pH 7.5, carboxylation, of the conserved Lys 70 in the catalytic site is observed. One oxygen atom, of the carboxylate group is hydrogen bonded to Ser 120 and Trp 160. The, other oxygen atom is more exposed and hydrogen bonded to the Ogamma of the, reactive Ser 67. In the overlay of the class D and class A binding sites, the carboxylate group is displaced ca. 2.6 A from the carboxylate group of, Glu 166 of class A enzymes. However, each group is equidistant from the, site of the water molecule expected to function in hydrolysis, and which, could be activated by the carboxylate group of Lys 70. In this ligand-free, OXA-1 structure, no water molecule is seen in this site, so the water, molecule must enter after formation of the acyl-Ser 67 intermediate.
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<StructureSection load='1m6k' size='340' side='right'caption='[[1m6k]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1m6k]] is a 2 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=1M6K OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1M6K 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]] 1.5&#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=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</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=1m6k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1m6k OCA], [https://pdbe.org/1m6k PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1m6k RCSB], [https://www.ebi.ac.uk/pdbsum/1m6k PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1m6k ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/BLO1_ECOLX BLO1_ECOLX] This is an oxacillin-hydrolyzing beta-lactamase.
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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/m6/1m6k_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=1m6k 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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1M6K is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with MPD as [http://en.wikipedia.org/wiki/ligand ligand]. 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://ispc.weizmann.ac.il/oca-bin/ocashort?id=1M6K 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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Comparison of beta-lactamases of classes A and D: 1.5-A crystallographic structure of the class D OXA-1 oxacillinase., Sun T, Nukaga M, Mayama K, Braswell EH, Knox JR, Protein Sci. 2003 Jan;12(1):82-91. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12493831 12493831]
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[[Category: Beta-lactamase]]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Braswell, E.H.]]
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[[Category: Braswell EH]]
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[[Category: Knox, J.R.]]
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[[Category: Knox JR]]
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[[Category: Mayama, K.]]
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[[Category: Mayama K]]
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[[Category: Nukaga, M.]]
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[[Category: Nukaga M]]
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[[Category: Sun, T.]]
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[[Category: Sun T]]
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[[Category: MPD]]
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[[Category: hydrolysis]]
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[[Category: lysine carbamylation]]
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[[Category: side chain modification]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 21:11:03 2007''
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Current revision

Structure of the OXA-1 class D beta-lactamase

PDB ID 1m6k

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