View source for 2fhx


==Pseudomonas aeruginosa SPM-1 metallo-beta-lactamase==
<StructureSection load='2fhx' size='340' side='right'caption='[[2fhx]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2fhx]] 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=2FHX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2FHX FirstGlance]. <br>
</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>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AZI:AZIDE+ION'>AZI</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CSD:3-SULFINOALANINE'>CSD</scene>, <scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2fhx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fhx OCA], [https://pdbe.org/2fhx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2fhx RCSB], [https://www.ebi.ac.uk/pdbsum/2fhx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2fhx ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q8G9Q0_PSEAI Q8G9Q0_PSEAI] 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fh/2fhx_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </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/main_output.php?pdb_ID=2fhx ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Metallo-beta-lactamases (mbetals) confer broad-spectrum resistance to beta-lactam antibiotics upon host bacteria and escape the action of existing beta-lactamase inhibitors. SPM-1 is a recently discovered mbetal that is distinguished from related enzymes by possession of a substantial central insertion and by sequence variation at positions that maintain active site structure. Biochemical data show SPM-1 to contain two Zn2+ sites of differing affinities, a phenomenon that is well documented amongst mbetals but for which a structural explanation has proved elusive. Here, we report the crystal structure of SPM-1 to 1.9 A resolution. The structure reveals SPM-1 to lack a mobile loop implicated in substrate binding by related mbetals and to accommodate the central insertion in an extended helical interdomain region. Deleting this had marginal effect upon binding and hydrolysis of a range of beta-lactams. These data suggest that the interactions of SPM-1 with substrates differ from those employed by other mbetals. SPM-1 as crystallised contains a single Zn2+. Both the active site hydrogen-bonding network and main-chain geometry at Asp120, a key component of the binding site for the second zinc ion, differ significantly from previous mbetal structures. We propose that variable interactions made by the Asp120 carbonyl group modulate affinity for a second Zn2+ equivalent in mbetals of the B1 subfamily. We further predict that SPM-1 possesses the capacity to evolve variants of enhanced catalytic activity by point mutations altering geometry and hydrogen bonding in the vicinity of the second Zn2+ site.

Crystal structure of Pseudomonas aeruginosa SPM-1 provides insights into variable zinc affinity of metallo-beta-lactamases.,Murphy TA, Catto LE, Halford SE, Hadfield AT, Minor W, Walsh TR, Spencer J J Mol Biol. 2006 Mar 31;357(3):890-903. Epub 2006 Jan 23. PMID:16460758<ref>PMID:16460758</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2fhx" style="background-color:#fffaf0;"></div>

==See Also==
*[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pseudomonas aeruginosa]]
[[Category: Catto LE]]
[[Category: Hadfield AT]]
[[Category: Halford SE]]
[[Category: Minor W]]
[[Category: Murphy TA]]
[[Category: Spencer J]]
[[Category: Walsh TR]]