2BGC

PrfA-G145S, a constitutive active mutant of the Transcriptional Regulator In L.monocytogenes


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.199 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

The Mutation G145S in Prfa, a Key Virulence Regulator of Listeria Monocytogenes, Increases DNA-Binding Affinity by Stabilizing the Hth Motif

Eiting, M.Hagelueken, G.Schubert, W.-D.Heinz, D.W.

(2005) Mol Microbiol 56: 433

  • DOI: https://doi.org/10.1111/j.1365-2958.2005.04561.x
  • Primary Citation of Related Structures:  
    2BEO, 2BGC

  • PubMed Abstract: 

    Listeria monocytogenes, a Gram-positive, facultative intracellular human pathogen, causes systemic infections with high mortality rate. The majority of the known pathogenicity factors of L. monocytogenes is regulated by a single transcription factor, PrfA. Hyperhaemolytic laboratory strains of L. monocytogenes express the constitutively active mutant PrfA(G145S) inducing virulence gene overexpression independent of environmental conditions. PrfA belongs to the Crp/Fnr family of transcription factors generally activated by a small effector, such as cAMP or O(2). We present the crystal structures of wild-type PrfA, the first Gram-positive member of the Crp/Fnr family, and of the constitutively active mutant PrfA(G145S). Cap (Crp) has previously been described exclusively in the cAMP-induced (DNA-free and -bound) conformation. By contrast, the PrfA structures present views both of the non-induced state and of the mutationally activated form. The low DNA-binding affinity of wild-type PrfA is supported both structurally (partly disordered helix-turn-helix motif, overall geometry of the HTH alpha-helices deviates from Cap) and by surface plasmon resonance analyses (K(D) = 0.9 microM). In PrfA(G145S) the HTH motifs dramatically rearrange to adopt a conformation comparable to cAMP-induced Cap and hence favourable for DNA binding, supported by a DNA-binding affinity of 50 nM. Finally, the hypothesis that wild-type PrfA, like other Crp/Fnr family members, may require an as yet unidentified cofactor for activation is supported by the presence of a distinct tunnel in PrfA, located at the interface of the beta-barrel and the DNA-binding domain.


  • Organizational Affiliation

    Division of Structural Biology, German Research Centre for Biotechnology (GBF), Mascheroder Weg 1, D-38124 Braunschweig, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PRFA238Listeria monocytogenes EGD-eMutation(s): 1 
UniProt
Find proteins for P22262 (Listeria monocytogenes serovar 1/2a (strain ATCC BAA-679 / EGD-e))
Explore P22262 
Go to UniProtKB:  P22262
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22262
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DTT
Query on DTT

Download Ideal Coordinates CCD File 
J [auth F]2,3-DIHYDROXY-1,4-DITHIOBUTANE
C4 H10 O2 S2
VHJLVAABSRFDPM-IMJSIDKUSA-N
DTU
Query on DTU

Download Ideal Coordinates CCD File 
I [auth A](2R,3S)-1,4-DIMERCAPTOBUTANE-2,3-DIOL
C4 H10 O2 S2
VHJLVAABSRFDPM-ZXZARUISSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
PR3
Query on PR3
A
B
C [auth D]
D [auth E]
E [auth F]
A,
B,
C [auth D],
D [auth E],
E [auth F],
F [auth G],
G [auth H],
H [auth I]
L-PEPTIDE LINKINGC6 H13 N O S2CYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.247α = 90
b = 100.243β = 90.33
c = 189.563γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
EPMRphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-04-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description