1fwc: Difference between revisions
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==KLEBSIELLA AEROGENES UREASE, C319A VARIANT AT PH 8.5== | ==KLEBSIELLA AEROGENES UREASE, C319A VARIANT AT PH 8.5== | ||
<StructureSection load='1fwc' size='340' side='right' caption='[[1fwc]], [[Resolution|resolution]] 2.00Å' scene=''> | <StructureSection load='1fwc' size='340' side='right' caption='[[1fwc]], [[Resolution|resolution]] 2.00Å' scene=''> | ||
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<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene></td></tr> | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene></td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Urease Urease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.1.5 3.5.1.5] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Urease Urease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.1.5 3.5.1.5] </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=1fwc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fwc OCA], [http://pdbe.org/1fwc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1fwc RCSB], [http://www.ebi.ac.uk/pdbsum/1fwc PDBsum]</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=1fwc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fwc OCA], [http://pdbe.org/1fwc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1fwc RCSB], [http://www.ebi.ac.uk/pdbsum/1fwc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1fwc ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fw/1fwc_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fw/1fwc_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
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</div> | </div> | ||
<div class="pdbe-citations 1fwc" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 1fwc" style="background-color:#fffaf0;"></div> | ||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 09:39, 3 January 2018
KLEBSIELLA AEROGENES UREASE, C319A VARIANT AT PH 8.5KLEBSIELLA AEROGENES UREASE, C319A VARIANT AT PH 8.5
Structural highlights
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 PubMedCys319 is located on a mobile flap covering the active site of Klebsiella aerogenes urease but does not play an essential role in catalysis. Four urease variants altered at position C319 range from having high activity (C319A) to no measurable activity (C319Y), indicating Cys is not required at this position, but its presence is highly influential [Martin, P. R., & Hausinger, R. P. (1992) J. Biol. Chem. 267, 20024-20027]. Here, we present 2.0 A resolution crystal structures of C319A, C319S, C319D, and C319Y proteins and the C319A variant inhibited by acetohydroxamic acid. These structures show changes in the hydration of the active site nickel ions and in the position and flexibility of the active site flap. The C319Y protein exhibits an alternate conformation of the flap, explaining its lack of activity. The changes in hydration and conformation suggest that there are suboptimal protein-solvent and protein-protein interactions in the empty urease active site which contribute to urease catalysis. Specifically, we hypothesize that the suboptimal interactions may provide a significant source of substrate binding energy, and such hidden energy may be a common phenomenon for enzymes that contain mobile active site loops and undergo an induced fit. The acetohydroxamic acid-bound structure reveals a chelate interaction similar to those seen in other metalloenzymes and in a small molecule nickel complex. The inhibitor binding mode supports the proposed mode of urea binding. We complement these structural studies with extended functional studies of C319A urease to show that it has enhanced stability and resistance to inhibition by buffers containing nickel ions. The near wild-type activity and enhanced stability of the C319A variant make it useful for further studies of urease structure-function relationships. Structures of Cys319 variants and acetohydroxamate-inhibited Klebsiella aerogenes urease.,Pearson MA, Michel LO, Hausinger RP, Karplus PA Biochemistry. 1997 Jul 1;36(26):8164-72. PMID:9201965[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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