2hp9: Difference between revisions
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==Crystal Structure of the OXA-10 W154A mutant at pH 6.0== | ==Crystal Structure of the OXA-10 W154A mutant at pH 6.0== | ||
<StructureSection load='2hp9' size='340' side='right' caption='[[2hp9]], [[Resolution|resolution]] 2.50Å' scene=''> | <StructureSection load='2hp9' size='340' side='right'caption='[[2hp9]], [[Resolution|resolution]] 2.50Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2hp9]] is a 2 chain structure with sequence from [ | <table><tr><td colspan='2'>[[2hp9]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HP9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2HP9 FirstGlance]. <br> | ||
</td></tr><tr><td class="sblockLbl"><b>[[ | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | |||
<tr><td class="sblockLbl"><b>[[ | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2hp9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2hp9 OCA], [https://pdbe.org/2hp9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2hp9 RCSB], [https://www.ebi.ac.uk/pdbsum/2hp9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2hp9 ProSAT]</span></td></tr> | ||
</table> | |||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | == Function == | ||
<table> | [https://www.uniprot.org/uniprot/BLO10_PSEAI BLO10_PSEAI] Hydrolyzes both carbenicillin and oxacillin. | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/hp/2hp9_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/hp/2hp9_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/ | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
</jmolCheckbox> | </jmolCheckbox> | ||
</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/ | </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=2hp9 ConSurf]. | ||
<div style="clear:both"></div> | <div style="clear:both"></div> | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 2hp9" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[Beta-lactamase|Beta-lactamase]] | *[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]] | ||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Pseudomonas aeruginosa]] | [[Category: Pseudomonas aeruginosa]] | ||
[[Category: Charlier | [[Category: Charlier P]] | ||
[[Category: Falzone | [[Category: Falzone C]] | ||
[[Category: Herman | [[Category: Herman R]] | ||
[[Category: Kerff | [[Category: Kerff F]] | ||
[[Category: Sauvage | [[Category: Sauvage E]] | ||
Latest revision as of 04:01, 21 November 2024
Crystal Structure of the OXA-10 W154A mutant at pH 6.0Crystal Structure of the OXA-10 W154A mutant at pH 6.0
Structural highlights
FunctionBLO10_PSEAI Hydrolyzes both carbenicillin and oxacillin. 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 PubMedThe catalytic efficiency of class D OXA-10 beta-lactamase depends critically on an unusual carboxylated lysine as the general base residue for both the enzyme acylation and deacylation steps of catalysis. Evidence is presented that the interaction between the indole group of Trp154 and the carboxylated lysine is essential for the stability of the post-translationally modified Lys70. Substitution of Trp154 by Gly, Ala or Phe yielded non carboxylated enzymes which displayed poor catalytic efficiencies and reduced stability when compared to the wild type OXA-10. The W154H mutant was partially carboxylated. In addition, the maximum values of kcat and kcat/KM were shifted toward pH 7 indicating that the carboxylation state of Lys70 is dependent on the protonation level of the histidine. A comparison of the three dimensional structures of the different proteins also indicated that the Trp154 mutations did not modify the overall structures of OXA-10 but induced an increased flexibility of the omega-loop in the active site. Finally, the deacylation impaired W154A mutant was used to determine the structure of the acyl-enzyme complex with benzylpenicillin. These results indicate a role of the Lys70 carboxylation during the deacylation step and emphasize the importance of Trp154 for the ideal positioning of active site residues leading to an optimum activity. Critical role of Tryptophan 154 for the activity and stability of class D beta-lactamases.,Baurin S, Vercheval L, Bouillenne F, Falzone C, Brans A, Jacquamet L, Ferrer JL, Sauvage E, Dehareng D, Frere JM, Charlier P, Galleni M, Kerff F Biochemistry. 2009 Oct 27. PMID:19860471[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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