4paz

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{{Seed}}
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==OXIDIZED MUTANT P80A PSEUDOAZURIN FROM A. FAECALIS==
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[[Image:4paz.png|left|200px]]
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<StructureSection load='4paz' size='340' side='right' caption='[[4paz]], [[Resolution|resolution]] 1.76&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[4paz]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Alcaligenes_faecalis Alcaligenes faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4PAZ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4PAZ FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene><br>
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<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3paz|3paz]], [[5paz|5paz]], [[6paz|6paz]], [[7paz|7paz]], [[8paz|8paz]]</td></tr>
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<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">POTENTIAL ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=511 Alcaligenes faecalis])</td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4paz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4paz OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4paz RCSB], [http://www.ebi.ac.uk/pdbsum/4paz PDBsum]</span></td></tr>
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<table>
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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/pa/4paz_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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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In order to understand the origins of differences in redox potentials among cupredoxins (small blue type I copper-containing proteins that reversibly change oxidation state and interact with redox partners), we have determined the structures of the native and two mutants (P80A and P80I) of pseudoazurin from Alcaligenes faecalis S-6 in oxidized and reduced forms at resolutions of 2.2 A in the worst case and 1.6 A in the best case. The P80A mutation creates a surface pocket filled by a new water molecule, whereas the P80I mutant excludes this water. Distinct patterns of change occur in response to reduction for all three molecules: the copper position shifts, Met 7 and Pro 35 move, and the relative orientations of residues 81 to 16, 18 to the amide planes of 77 and 86, all change. Systematic changes in the weak electrostatic interactions seen in the structures of different oxidation states can explain the Met 7/Pro 35 structural differences as well as some fluctuating solvent positions. Overall displacement parameters increase reversibly upon reduction. The reduced forms are slightly expanded over the oxidized forms. The geometries of the mutants become more trigonal in their reduced forms, consistent with higher redox potentials (+409 mV for P80A and +450 mV for P80I). Calculations of the differences in redox potentials, using POLARIS, reveal that a water unique to the P80A mutant is required (with correctly oriented hydrogens) to approximate the observed difference in redox potential. The POLARIS calculations suggest that the reduced forms are additionally stabilized through changes in the solvation of the copper center, specifically via the amides of residues 16, 39, 41, 79, and 80 which interact with either Phe 18, Met 86, or Cys 78. The redox potential of P80A is increased largely due to solvation effects, whereas the redox potential of P80I is increased largely due to geometrical effects.
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Site-directed mutants of pseudoazurin: explanation of increased redox potentials from X-ray structures and from calculation of redox potential differences.,Libeu CA, Kukimoto M, Nishiyama M, Horinouchi S, Adman ET Biochemistry. 1997 Oct 28;36(43):13160-79. PMID:9341204<ref>PMID:9341204</ref>
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The line below this paragraph, containing "STRUCTURE_4paz", creates the "Structure Box" on the page.
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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or leave the SCENE parameter empty for the default display.
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-->
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{{STRUCTURE_4paz| PDB=4paz | SCENE= }}
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===OXIDIZED MUTANT P80A PSEUDOAZURIN FROM A. FAECALIS===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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== References ==
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<!--
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<references/>
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The line below this paragraph, {{ABSTRACT_PUBMED_9341204}}, adds the Publication Abstract to the page
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__TOC__
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(as it appears on PubMed at http://www.pubmed.gov), where 9341204 is the PubMed ID number.
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</StructureSection>
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-->
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{{ABSTRACT_PUBMED_9341204}}
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==About this Structure==
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4PAZ is a 1 chain structure of sequence from [http://en.wikipedia.org/wiki/Alcaligenes_faecalis Alcaligenes faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4PAZ OCA].
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==Reference==
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<ref group="xtra">PMID:9341204</ref><references group="xtra"/>
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[[Category: Alcaligenes faecalis]]
[[Category: Alcaligenes faecalis]]
[[Category: Adman, E T.]]
[[Category: Adman, E T.]]
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[[Category: Cuproprotein]]
[[Category: Cuproprotein]]
[[Category: Electron transfer]]
[[Category: Electron transfer]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Feb 18 06:23:38 2009''
 

Revision as of 07:33, 5 June 2014

OXIDIZED MUTANT P80A PSEUDOAZURIN FROM A. FAECALIS

4paz, resolution 1.76Å

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