1e0z: Difference between revisions
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==[2Fe-2S]-Ferredoxin from Halobacterium salinarum== | |||
<StructureSection load='1e0z' size='340' side='right'caption='[[1e0z]]' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1e0z]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Halobacterium_salinarum Halobacterium salinarum]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E0Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1E0Z FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 20 models</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ALY:N(6)-ACETYLLYSINE'>ALY</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</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=1e0z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e0z OCA], [https://pdbe.org/1e0z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1e0z RCSB], [https://www.ebi.ac.uk/pdbsum/1e0z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1e0z ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/FER_HALSA FER_HALSA] Ferredoxins are iron-sulfur proteins that transfer electrons in a wide variety of metabolic reactions. | |||
== 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/e0/1e0z_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=1e0z ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The [2Fe-2S] ferredoxin (HsFdx) of the halophilic archaeon Halobacterium salinarum exhibits a high degree of sequence conservation with plant-type ferredoxins except for an insertion of 30 amino acids near its N-terminus which is extremely rich in acidic amino acids. Unfolding studies reveal that HsFdx has an unfolding temperature of approximately 85 degrees C in 4.3 M NaCl, but of only 50 degrees C in low salinity, revealing its halophilic character. The three-dimensional structure of HsFdx was determined by NMR spectroscopy, resulting in a backbone rmsd of 0.6 A for the diamagnetic regions of the protein. Whereas the overall structure of HsFdx is very similar to that of the plant-type ferredoxins, two additional alpha-helices are found in the acidic extra domain. (15)N NMR relaxation studies indicate that HsFdx is rigid, and the flexibility of residues is similar throughout the molecule. Monitoring protein denaturation by NMR did not reveal differences between the core fold and the acidic domain, suggesting a cooperative unfolding of both parts of the molecule. A mutant of the HsFdx in which the acidic domain is replaced with a short loop of the nonhalophilic Anabaena ferredoxin shows a considerably changed expression pattern. The halophilic wild-type protein is readily expressed in large amounts in H. salinarum, but not in Escherichia coli, whereas the mutant ferredoxin could only be overexpressed in E. coli. The salt concentration was also found to play a critical role for the efficiency of cluster reconstitution: the cluster of HsFdx could be reconstituted only in a solution containing molar concentrations of NaCl, while the reconstitution of the cluster in the mutant protein proceeds efficiently in low salt. These findings suggest that the acidic domain mediates the halophilic character which is reflected in its thermostability, the exclusive expression in H. salinarum, and the ability to efficiently reconstitute the iron-sulfur cluster only at high salt concentrations. | |||
A two-alpha-helix extra domain mediates the halophilic character of a plant-type ferredoxin from halophilic archaea.,Marg BL, Schweimer K, Sticht H, Oesterhelt D Biochemistry. 2005 Jan 11;44(1):29-39. PMID:15628843<ref>PMID:15628843</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1e0z" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[Ferredoxin|Ferredoxin]] | *[[Ferredoxin 3D structures|Ferredoxin 3D structures]] | ||
== References == | |||
== | <references/> | ||
< | __TOC__ | ||
</StructureSection> | |||
[[Category: Halobacterium salinarum]] | [[Category: Halobacterium salinarum]] | ||
[[Category: Marg | [[Category: Large Structures]] | ||
[[Category: Oesterhelt | [[Category: Marg B]] | ||
[[Category: Roesch | [[Category: Oesterhelt D]] | ||
[[Category: Schweimer | [[Category: Roesch P]] | ||
[[Category: Sticht | [[Category: Schweimer K]] | ||
[[Category: Sticht H]] | |||