View source for 1ddn


==DIPHTHERIA TOX REPRESSOR (C102D MUTANT)/TOX DNA OPERATOR COMPLEX==
<StructureSection load='1ddn' size='340' side='right'caption='[[1ddn]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ddn]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Corynebacterium_diphtheriae Corynebacterium diphtheriae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DDN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1DDN 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]] 3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</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=1ddn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ddn OCA], [https://pdbe.org/1ddn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ddn RCSB], [https://www.ebi.ac.uk/pdbsum/1ddn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ddn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DTXR_CORDI DTXR_CORDI] Iron-binding repressor of the dipheteria toxin gene expression. May serve as a global regulator of gene expression. Represses ripA under iron excess.
== 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/dd/1ddn_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/main_output.php?pdb_ID=1ddn ConSurf].
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== Publication Abstract from PubMed ==
The virulent phenotype of the pathogenic bacterium Corynebacterium diphtheriae is conferred by diphtheria toxin, whose expression is an adaptive response to low concentrations of iron. The expression of the toxin gene (tox) is regulated by the repressor DtxR, which is activated by transition metal ions. X-ray crystal structures of DtxR with and without (apo-form) its coordinated transition metal ion have established the general architecture of the repressor, identified the location of the metal-binding sites, and revealed a metal-ion-triggered subunit-subunit 'caliper-like' conformational change. Here we report the three-dimensional crystal structure of the complex between a biologically active Ni(II)-bound DtxR(C102D) mutant, in which a cysteine is replaced by an aspartate at residue 102, and a 33-base-pair DNA segment containing the toxin operator toxO. This structure shows that DNA interacts with two dimeric repressor proteins bound to opposite sides of the tox operator. We propose that a metal-ion-induced helix-to-coil structural transition in the amino-terminal region of the protein is partly responsible for the unique mode of repressor activation by transition metal ions.

Structure of the metal-ion-activated diphtheria toxin repressor/tox operator complex.,White A, Ding X, vanderSpek JC, Murphy JR, Ringe D Nature. 1998 Jul 30;394(6692):502-6. PMID:9697776<ref>PMID:9697776</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 1ddn" style="background-color:#fffaf0;"></div>

==See Also==
*[[Diphtheria toxin repressor|Diphtheria toxin repressor]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Corynebacterium diphtheriae]]
[[Category: Large Structures]]
[[Category: Ding X]]
[[Category: Murphy JR]]
[[Category: Ringe D]]
[[Category: Vanderspek JC]]
[[Category: White A]]