2hxa: Difference between revisions

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-[[Image:2hxa.png|left|200px]]
+==Crystal structure of Cu(I) Azurin with the metal-binding loop sequence "CTFPGHSALM" replaced with "CSPHQGAGM", at pH3.5==
+<StructureSection load='2hxa' size='340' side='right' caption='[[2hxa]], [[Resolution|resolution]] 2.21&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[2hxa]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HXA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2HXA FirstGlance]. <br>
+</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CU1:COPPER+(I)+ION'>CU1</scene><br>
+<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2fta|2fta]], [[2ft6|2ft6]], [[2ft7|2ft7]], [[2ft8|2ft8]]</td></tr>
+<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">azu ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=287 Pseudomonas aeruginosa])</td></tr>
+<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=2hxa FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2hxa OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2hxa RCSB], [http://www.ebi.ac.uk/pdbsum/2hxa PDBsum]</span></td></tr>
+<table>
+== 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/hx/2hxa_consurf.spt"</scriptWhenChecked>
+    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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/chain_selection.php?pdb_ID=2ata ConSurf].
+<div style="clear:both"></div>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+The ligand-containing loops of two copper-binding electron-transfer proteins (cupredoxins) have been swapped. In the azurin (AZ) variant in which the plastocyanin (PC) sequence is introduced (AZPC), the loop adopts a conformation identical to that in PC. The reduction potential of AZPC is raised as compared to AZ and matches that of PC. In the previously published AZAMI variant (AMI = amicyanin), the shorter introduced loop adopts the same conformation as in AMI, and the reduction potential is lowered to equal that of AMI (Yanagisawa, S.; Dennison, C. J. Am. Chem. Soc. 2004, 126, 15711-15719. Li, C.; et al. Proc. Natl. Acad. Sci. U.S.A. 2006, 103, 7258-7263). Thus, the loop structure plays an important role in tuning the reduction potential of a type 1 copper site with contributions from protein dipoles in this region probably the most important feature. The structure of the loop also seems to be a major factor in controlling dissociation and protonation of the C-terminal His ligand, which can act as a switch to regulate electron-transfer reactivity. The PCAZ variant (PC with the AZ loop) possesses an active site, which is different from those of both PC and AZ, and it is assumed that the introduced loop does not adopt a structure as in AZ. This contributes to the observed instability of PCAZ and highlights that loop-scaffold interactions are important for stabilizing the active site of a cupredoxin.
-{{STRUCTURE_2hxa|  PDB=2hxa  |  SCENE=  }}
+Engineering copper sites in proteins: loops confer native structures and properties to chimeric cupredoxins.,Li C, Banfield MJ, Dennison C J Am Chem Soc. 2007 Jan 24;129(3):709-18. PMID:17227035<ref>PMID:17227035</ref>
-===Crystal structure of Cu(I) Azurin with the metal-binding loop sequence "CTFPGHSALM" replaced with "CSPHQGAGM", at pH3.5===
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+</div>
-{{ABSTRACT_PUBMED_17227035}}
+==See Also==
+*[[Azurin|Azurin]]
-==About this Structure==
+== References ==
-[[2hxa]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HXA OCA].
+<references/>
+__TOC__
-==Reference==
+</StructureSection>
-<ref group="xtra">PMID:017227035</ref><ref group="xtra">PMID:016651527</ref><references group="xtra"/>
 [[Category: Pseudomonas aeruginosa]]
 [[Category: Banfield, M J.]]