2F7A

BenM effector binding domain with its effector, cis,cis-muconate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Distinct Effector-binding Sites Enable Synergistic Transcriptional Activation by BenM, a LysR-type Regulator.

Ezezika, O.C.Haddad, S.Clark, T.J.Neidle, E.L.Momany, C.

(2007) J Mol Biol 367: 616-629

  • DOI: https://doi.org/10.1016/j.jmb.2006.09.090
  • Primary Citation of Related Structures:  
    2F6G, 2F6P, 2F78, 2F7A, 2F7B, 2F7C

  • PubMed Abstract: 

    BenM, a bacterial transcriptional regulator, responds synergistically to two effectors, benzoate and cis,cis-muconate. CatM, a paralog with overlapping function, responds only to muconate. Structures of their effector-binding domains revealed two effector-binding sites in BenM. BenM and CatM are the first LysR-type regulators to be structurally characterized while bound with physiologically relevant exogenous inducers. The effector complexes were obtained by soaking crystals with stabilizing solutions containing high effector concentrations and minimal amounts of competing ions. This strategy, including data collection with fragments of fractured crystals, may be generally applicable to related proteins. In BenM and CatM, the binding of muconate to an interdomain pocket was facilitated by helix dipoles that provide charge stabilization. In BenM, benzoate also bound in an adjacent hydrophobic region where it alters the effect of muconate bound in the primary site. A charge relay system within the BenM protein appears to underlie synergistic transcriptional activation. According to this model, Glu162 is a pivotal residue that forms salt-bridges with different arginine residues depending on the occupancy of the secondary effector-binding site. Glu162 interacts with Arg160 in the absence of benzoate and with Arg146 when benzoate is bound. This latter interaction enhances the negative charge of muconate bound to the adjacent primary effector-binding site. The redistribution of the electrostatic potential draws two domains of the protein more closely towards muconate, with the movement mediated by the dipole moments of four alpha helices. Therefore, with both effectors, BenM achieves a unique conformation capable of high level transcriptional activation.


  • Organizational Affiliation

    Department of Microbiology, University of Georgia, Athens, GA 30602-2605, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HTH-type transcriptional regulator benM
A, B
232Acinetobacter baylyiMutation(s): 0 
Gene Names: benMbenR
UniProt
Find proteins for O68014 (Acinetobacter baylyi (strain ATCC 33305 / BD413 / ADP1))
Explore O68014 
Go to UniProtKB:  O68014
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO68014
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.741α = 90
b = 65.777β = 90
c = 117.974γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-10-31
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description
  • Version 1.4: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description