3WHC

Crystal structure of a transcriptional regulator FadR from Bacillus subtilis in complex with stearoyl-CoA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.240 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural characterization of a ligand-bound form of Bacillus subtilis FadR involved in the regulation of fatty acid degradation.

Fujihashi, M.Nakatani, T.Hirooka, K.Matsuoka, H.Fujita, Y.Miki, K.

(2014) Proteins 82: 1301-1310

  • DOI: https://doi.org/10.1002/prot.24496
  • Primary Citation of Related Structures:  
    3WHB, 3WHC

  • PubMed Abstract: 

    Bacillus subtilis FadR (FadR(Bs)), a member of the TetR family of bacterial transcriptional regulators, represses five fad operons including 15 genes, most of which are involved in β-oxidation of fatty acids. FadR(Bs) binds to the five FadR(Bs) boxes in the promoter regions and the binding is specifically inhibited by long-chain (C14-C20 ) acyl-CoAs, causing derepression of the fad operons. To elucidate the structural mechanism of this regulator, we have determined the crystal structures of FadR(Bs) proteins prepared with and without stearoyl(C18)-CoA. The crystal structure without adding any ligand molecules unexpectedly includes one small molecule, probably dodecyl(C12)-CoA derived from the Escherichia coli host, in its homodimeric structure. Also, we successfully obtained the structure of the ligand-bound form of the FadR(Bs) dimer by co-crystallization, in which two stearoyl-CoA molecules are accommodated, with the binding mode being essentially equivalent to that of dodecyl-CoA. Although the acyl-chain-binding cavity of FadR(Bs) is mainly hydrophobic, a hydrophilic patch encompasses the C1-C10 carbons of the acyl chain. This accounts for the previous report that the DNA binding of FadR(Bs) is specifically inhibited by the long-chain acyl-CoAs but not by the shorter ones. Structural comparison of the ligand-bound and unliganded subunits of FadR(Bs) revealed three regions around residues 21-31, 61-76, and 106-119 that were substantially changed in response to the ligand binding, and particularly with respect to the movements of Leu108 and Arg109. Site-directed mutagenesis of these residues revealed that Arg109, but not Leu108, is a key residue for maintenance of the DNA-binding affinity of FadR(Bs).


  • Organizational Affiliation

    Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fatty acid metabolism regulator protein
A, B, C, D, E
A, B, C, D, E, F
194Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: fadRysiABSU28550
UniProt
Find proteins for P94548 (Bacillus subtilis (strain 168))
Explore P94548 
Go to UniProtKB:  P94548
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP94548
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.240 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.305α = 90
b = 88.762β = 90
c = 199.952γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-19
    Type: Initial release
  • Version 1.1: 2017-02-22
    Changes: Database references
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description