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[[Image:3il2.png|left|200px]]
==Crystal structure of a Rex-family repressor R90D mutant/DNA complex from Thermus aquaticus==
<StructureSection load='3il2' size='340' side='right' caption='[[3il2]], [[Resolution|resolution]] 2.49&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3il2]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Thermus_thermophilus_hb27 Thermus thermophilus hb27]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3IL2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3IL2 FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=BRU:5-BROMO-2-DEOXYURIDINE-5-MONOPHOSPHATE'>BRU</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1xcb|1xcb]], [[3ikt|3ikt]], [[3ikv|3ikv]]</td></tr>
<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">rex, TT_C1293 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=262724 Thermus thermophilus HB27])</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=3il2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3il2 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3il2 RCSB], [http://www.ebi.ac.uk/pdbsum/3il2 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/il/3il2_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 ==
Nicotinamide adenine dinucleotides have emerged as key signals of the cellular redox state. Yet the structural basis for allosteric gene regulation by the ratio of reduced NADH to oxidized NAD(+) is poorly understood. A key sensor among Gram-positive bacteria, Rex represses alternative respiratory gene expression until a limited oxygen supply elevates the intracellular NADH:NAD(+) ratio. Here we investigate the molecular mechanism for NADH/NAD(+) sensing among Rex family members by determining structures of Thermus aquaticus Rex bound to (1) NAD(+), (2) DNA operator, and (3) without ligand. Comparison with the Rex/NADH complex reveals that NADH releases Rex from the DNA site following a 40 degrees closure between the dimeric subunits. Complementary site-directed mutagenesis experiments implicate highly conserved residues in NAD-responsive DNA-binding activity. These rare views of a redox sensor in action establish a means for slight differences in the nicotinamide charge, pucker, and orientation to signal the redox state of the cell.


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Structural basis for NADH/NAD+ redox sensing by a Rex family repressor.,McLaughlin KJ, Strain-Damerell CM, Xie K, Brekasis D, Soares AS, Paget MS, Kielkopf CL Mol Cell. 2010 May 28;38(4):563-75. PMID:20513431<ref>PMID:20513431</ref>
The line below this paragraph, containing "STRUCTURE_3il2", creates the "Structure Box" on the page.
You may change the PDB parameter (which sets the PDB file loaded into the applet)  
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
or leave the SCENE parameter empty for the default display.
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{{STRUCTURE_3il2|  PDB=3il2  |  SCENE=  }}


===Crystal structure of a Rex-family repressor R90D mutant/DNA complex from Thermus aquaticus===
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
 
</div>
 
== References ==
<!--
<references/>
The line below this paragraph, {{ABSTRACT_PUBMED_20513431}}, adds the Publication Abstract to the page
__TOC__
(as it appears on PubMed at http://www.pubmed.gov), where 20513431 is the PubMed ID number.
</StructureSection>
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{{ABSTRACT_PUBMED_20513431}}
 
==About this Structure==
[[3il2]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Thermus_thermophilus_hb27 Thermus thermophilus hb27]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3IL2 OCA].
 
==Reference==
<ref group="xtra">PMID:020513431</ref><references group="xtra"/>
[[Category: Thermus thermophilus hb27]]
[[Category: Thermus thermophilus hb27]]
[[Category: Kielkopf, C L.]]
[[Category: Kielkopf, C L.]]

Revision as of 09:52, 21 May 2014

Crystal structure of a Rex-family repressor R90D mutant/DNA complex from Thermus aquaticus

3il2, resolution 2.49Å

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