2H9B

Crystal structure of the effector binding domain of a BenM variant (BenM R156H/T157S)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Inducer responses of BenM, a LysR-type transcriptional regulator from Acinetobacter baylyi ADP1.

Craven, S.H.Ezezika, O.C.Haddad, S.Hall, R.A.Momany, C.Neidle, E.L.

(2009) Mol Microbiol 72: 881-894

  • DOI: 10.1111/j.1365-2958.2009.06686.x
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • BenM and CatM control transcription of a complex regulon for aromatic compound degradation. These Acinetobacter baylyi paralogues belong to the largest family of prokaryotic transcriptional regulators, the LysR-type proteins. Whereas BenM activates t ...

    BenM and CatM control transcription of a complex regulon for aromatic compound degradation. These Acinetobacter baylyi paralogues belong to the largest family of prokaryotic transcriptional regulators, the LysR-type proteins. Whereas BenM activates transcription synergistically in response to two effectors, benzoate and cis,cis-muconate, CatM responds only to cis,cis-muconate. Here, site-directed mutagenesis was used to determine the physiological significance of an unexpected benzoate-binding pocket in BenM discovered during structural studies. Residues in BenM were changed to match those of CatM in this hydrophobic pocket. Two BenM residues, R160 and Y293, were found to mediate the response to benzoate. Additionally, alteration of these residues caused benzoate to inhibit activation by cis,cis-muconate, positioned in a separate primary effector-binding site of BenM. The location of the primary site, in an interdomain cleft, is conserved in diverse LysR-type regulators. To improve understanding of this important family, additional regulatory mutants were analysed. The atomic-level structures were characterized of the effector-binding domains of variants that do not require inducers for activation, CatM(R156H) and BenM(R156H,T157S). These structures clearly resemble those of the wild-type proteins in their activated muconate-bound complexes. Amino acid replacements that enable activation without effectors reside at protein interfaces that may impact transcription through effects on oligomerization.


    Related Citations: 
    • 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.
      () To be published --: --

    Organizational Affiliation

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



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HTH-type transcriptional regulator benMA, B312Acinetobacter baylyi ADP1Mutation(s): 2 
Gene Names: benMbenRACIAD1435
Find proteins for O68014 (Acinetobacter baylyi (strain ATCC 33305 / BD413 / ADP1))
Explore O68014 
Go to UniProtKB:  O68014
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.51α = 90
b = 66.587β = 90
c = 117.971γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description