5XXP

Crystal structure of CbnR_DBD-DNA complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure of the DNA-binding domain of the LysR-type transcriptional regulator CbnR in complex with a DNA fragment of the recognition-binding site in the promoter region

Koentjoro, M.P.Adachi, N.Senda, M.Ogawa, N.Senda, T.

(2018) FEBS J. --: --

  • DOI: 10.1111/febs.14380

  • PubMed Abstract: 
  • LysR-type transcriptional regulators (LTTRs) are among the most abundant transcriptional regulators in bacteria. CbnR is an LTTR derived from Cupriavidus necator (formerly Alcaligenes eutrophus or Ralstonia eutropha) NH9 and is involved in transcript ...

    LysR-type transcriptional regulators (LTTRs) are among the most abundant transcriptional regulators in bacteria. CbnR is an LTTR derived from Cupriavidus necator (formerly Alcaligenes eutrophus or Ralstonia eutropha) NH9 and is involved in transcriptional activation of the cbnABCD genes encoding chlorocatechol degradative enzymes. CbnR interacts with a cbnA promoter region of approximately 60 bp in length that contains the recognition-binding site (RBS) and activation-binding site (ABS). Upon inducer binding, CbnR seems to undergo conformational changes, leading to the activation of the transcription. Since the interaction of an LTTR with RBS is considered to be the first step of the transcriptional activation, the CbnR-RBS interaction is responsible for the selectivity of the promoter to be activated. To understand the sequence selectivity of CbnR, we determined the crystal structure of the DNA-binding domain of CbnR in complex with RBS of the cbnA promoter at 2.55 Å resolution. The crystal structure revealed details of the interactions between the DNA-binding domain and the promoter DNA. A comparison with the previously reported crystal structure of the DNA-binding domain of BenM in complex with its cognate RBS showed several differences in the DNA interactions, despite the structural similarity between CbnR and BenM. These differences explain the observed promoter sequence selectivity between CbnR and BenM. Particularly, the difference between Thr33 in CbnR and Ser33 in BenM appears to affect the conformations of neighboring residues, leading to the selective interactions with DNA.


    Organizational Affiliation

    The United Graduate School of Agricultural Science, Gifu University, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LysR-type regulatory protein
A, B
101Cupriavidus necatorGene Names: cbnR
Find proteins for Q9WXC7 (Cupriavidus necator)
Go to UniProtKB:  Q9WXC7
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (25-MER)E25Cupriavidus necator
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (25-MER)F25Cupriavidus necator
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.219 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 186.457α = 90.00
b = 28.719β = 111.65
c = 73.153γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction
BALBESphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-07-04 
  • Released Date: 2018-01-17 
  • Deposition Author(s): Senda, T., Senda, M.

Funding OrganizationCountryGrant Number
KakenhiJapan--

Revision History 

  • Version 1.0: 2018-01-17
    Type: Initial release
  • Version 1.1: 2018-02-07
    Type: Database references