1f5t: Difference between revisions

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[[Image:1f5t.gif|left|200px]]


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==DIPHTHERIA TOX REPRESSOR (C102D MUTANT) COMPLEXED WITH NICKEL AND DTXR CONSENSUS BINDING SEQUENCE==
The line below this paragraph, containing "STRUCTURE_1f5t", creates the "Structure Box" on the page.
<StructureSection load='1f5t' size='340' side='right'caption='[[1f5t]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)  
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1f5t]] 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=1F5T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1F5T FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</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>
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<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>
{{STRUCTURE_1f5t| PDB=1f5t |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1f5t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f5t OCA], [https://pdbe.org/1f5t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1f5t RCSB], [https://www.ebi.ac.uk/pdbsum/1f5t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1f5t 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/f5/1f5t_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=1f5t ConSurf].
<div style="clear:both"></div>


'''DIPHTHERIA TOX REPRESSOR (C102D MUTANT) COMPLEXED WITH NICKEL AND DTXR CONSENSUS BINDING SEQUENCE'''
==See Also==
 
*[[Diphtheria toxin repressor|Diphtheria toxin repressor]]
 
__TOC__
==Overview==
</StructureSection>
The expression of diphtheria toxin is controlled by the diphtheria toxin repressor (DtxR). Under conditions of high iron concentration, DtxR binds the tox operator to inhibit transcription. To study how DNA binding specificity is achieved by this repressor, we solved the crystal structure of the nickel(II) activated DtxR(C102D) mutant complexed with a 43mer DNA duplex containing the DtxR consensus binding sequence. Structural analysis of this complex and comparison with a previously determined DtxR(C102D)-Ni(II)-tox operator ternary complex revealed unusual van der Waals interactions between Ser37/Pro39 of the repressor helix-turn-helix (HTH) motif and the methyl groups of specific thymine bases in the consensus binding sequence. Gel mobility shift assays utilizing deoxyuridine modified duplex DNA probes proved the importance of these interactions: the four methyl groups shown to interact with Ser37/Pro39 in the crystal structure contribute a total of 3.4 kcal/mol to binding energy. Thus, in addition to making base-specific hydrogen-bonding interactions to the DNA through its Gln43 residue, DtxR also recognizes methyl groups at certain positions in the DNA sequence with its Ser37 and Pro39 side chains, to achieve binding specificity toward its cognate operator sequences.
 
==About this Structure==
1F5T is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Corynebacterium_diphtheriae Corynebacterium diphtheriae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F5T OCA].
 
==Reference==
Methyl groups of thymine bases are important for nucleic acid recognition by DtxR., Chen CS, White A, Love J, Murphy JR, Ringe D, Biochemistry. 2000 Aug 29;39(34):10397-407. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10956029 10956029]
[[Category: Corynebacterium diphtheriae]]
[[Category: Corynebacterium diphtheriae]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Chen, S.]]
[[Category: Chen S]]
[[Category: Love, J.]]
[[Category: Love J]]
[[Category: Murphy, J R.]]
[[Category: Murphy JR]]
[[Category: Ringe, D.]]
[[Category: Ringe D]]
[[Category: White, A.]]
[[Category: White A]]
[[Category: Diphtheria tox repressor]]
[[Category: Dna-binding regulatory protein]]
[[Category: Dna-protein complex]]
[[Category: Helix-turn-helix motif]]
[[Category: Iron-regulated repressor]]
[[Category: Transcription regulator]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 15:56:07 2008''

Latest revision as of 10:11, 7 February 2024

DIPHTHERIA TOX REPRESSOR (C102D MUTANT) COMPLEXED WITH NICKEL AND DTXR CONSENSUS BINDING SEQUENCEDIPHTHERIA TOX REPRESSOR (C102D MUTANT) COMPLEXED WITH NICKEL AND DTXR CONSENSUS BINDING SEQUENCE

Structural highlights

1f5t is a 6 chain structure with sequence from Corynebacterium diphtheriae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 3Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

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

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1f5t, resolution 3.00Å

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