5FO5

Structure of the DNA-binding domain of Escherichia coli methionine biosynthesis regulator MetR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis for DNA Recognition by the Transcription Regulator Metr.

Punekar, A.S.Porter, J.Carr, S.B.Phillips, S.E.V.

(2016) Acta Crystallogr.,Sect.F 72: 417

  • DOI: 10.1107/S2053230X16006828

  • PubMed Abstract: 
  • MetR, a LysR-type transcriptional regulator (LTTR), has been extensively studied owing to its role in the control of methionine biosynthesis in proteobacteria. A MetR homodimer binds to a 24-base-pair operator region of the met genes and specifically ...

    MetR, a LysR-type transcriptional regulator (LTTR), has been extensively studied owing to its role in the control of methionine biosynthesis in proteobacteria. A MetR homodimer binds to a 24-base-pair operator region of the met genes and specifically recognizes the interrupted palindromic sequence 5'-TGAA-N5-TTCA-3'. Mechanistic details underlying the interaction of MetR with its target DNA at the molecular level remain unknown. In this work, the crystal structure of the DNA-binding domain (DBD) of MetR was determined at 2.16 Å resolution. MetR-DBD adopts a winged-helix-turn-helix (wHTH) motif and shares significant fold similarity with the DBD of the LTTR protein BenM. Furthermore, a data-driven macromolecular-docking strategy was used to model the structure of MetR-DBD bound to DNA, which revealed that a bent conformation of DNA is required for the recognition helix α3 and the wing loop of the wHTH motif to interact with the major and minor grooves, respectively. Comparison of the MetR-DBD-DNA complex with the crystal structures of other LTTR-DBD-DNA complexes revealed residues that may confer operator-sequence binding specificity for MetR. Taken together, the results show that MetR-DBD uses a combination of direct base-specific interactions and indirect shape recognition of the promoter to regulate the transcription of met genes.


    Organizational Affiliation

    Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0FA, England.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HTH-TYPE TRANSCRIPTIONAL REGULATOR METR
A
92Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: metR
Find proteins for P0A9F9 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A9F9
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.191 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 27.760α = 90.00
b = 55.120β = 98.82
c = 49.990γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
XSCALEdata scaling
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-06-08
    Type: Initial release
  • Version 1.1: 2016-06-29
    Type: Database references
  • Version 1.2: 2017-08-16
    Type: Other