1C0W

CRYSTAL STRUCTURE OF THE COBALT-ACTIVATED DIPHTHERIA TOXIN REPRESSOR-DNA COMPLEX REVEALS A METAL BINDING SH-LIKE DOMAIN

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.249 

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This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of a cobalt-activated diphtheria toxin repressor-DNA complex reveals a metal-binding SH3-like domain.

Pohl, E., Holmes, R.K., Hol, W.G.

(1999) J Mol Biol 292: 653-667

  • DOI: 10.1006/jmbi.1999.3073
  • Primary Citation of Related Structures:  
    1C0W

  • PubMed Abstract: 

    • The diphtheria toxin repressor (DtxR) is the prototype of a family of iron-dependent regulator (IdeR) proteins, which are activated by divalent iron and bind DNA to prevent the transcription of downstream genes. In Corynebacterium diphtheriae, DtxR regulates not only the expression of diphtheria toxin encoded by a corynebacteriophage, but also of components of the siderophore-mediated iron-transport system ...

    The diphtheria toxin repressor (DtxR) is the prototype of a family of iron-dependent regulator (IdeR) proteins, which are activated by divalent iron and bind DNA to prevent the transcription of downstream genes. In Corynebacterium diphtheriae, DtxR regulates not only the expression of diphtheria toxin encoded by a corynebacteriophage, but also of components of the siderophore-mediated iron-transport system. Here we report the crystal structure of wild-type DtxR, a 226 residue three-domain dimeric protein, activated by cobalt and bound to a 21 bp DNA duplex based on the consensus operator sequence. Two DtxR dimers surround the DNA duplex which is distorted compared to canonical B -DNA. The SH3-like third domain interacts with the metal at site 1 via the side-chains of Glu170 and Gln173, revealing for the first time a metal-binding function for this class of domains. The SH3-like domain is also in contact with the DNA-binding first domain and with the second, or dimerization, domain. The DNA-binding helices in the first domain are shifted by 3 to 5 A when compared to the apo-repressor, and fit into the major groove of the duplex bound. These shifts are due to a hinge-binding motion of the DNA-binding domain with respect to the dimerization domains of DtxR. The third domain might play a role in regulating this hinge motion.

    Organizational Affiliation: 

    Department of Biological Structure, University of Washington, Seattle, WA 98195, USA.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DIPHTHERIA TOXIN REPRESSORC [auth A],
D [auth B],
E [auth C],
F [auth D]		225Corynebacterium diphtheriaeMutation(s): 0 
Gene Names: dtxR
UniProt
Find proteins for P0DJL7 (Corynebacterium diphtheriae (strain ATCC 700971 / NCTC 13129 / Biotype gravis))
Explore P0DJL7 
Go to UniProtKB:  P0DJL7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DJL7
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*AP*TP*TP*AP*GP*GP*TP*TP*AP*GP*CP*CP*TP*AP*CP*CP*CP*TP*AP*AP*T)-3')A [auth E]21N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*AP*TP*TP*AP*GP*GP*TP*TP*AP*GP*GP*CP*TP*AP*CP*CP*CP*TP*AP*AP*T)-3')B [auth F]21N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.249 
  • Space Group: P 42 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 180.2α = 90
b = 180.2β = 90
c = 151γ = 90
Software Package:
Software NamePurpose
AMoREphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-07-22
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance