6QVY

The Transcriptional Regulator PrfA-A94V mutant from Listeria Monocytogenes


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.69 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.152 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

A Novel Growth-Based Selection Strategy Identifies New Constitutively Active Variants of the Major Virulence Regulator PrfA in Listeria monocytogenes.

Hansen, S.Hall, M.Grundstrom, C.Brannstrom, K.Sauer-Eriksson, A.E.Johansson, J.

(2020) J Bacteriol 202

  • DOI: 10.1128/JB.00115-20
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Listeria monocytogenes is a Gram-positive pathogen able to cause severe human infections. Its major virulence regulator is the transcriptional activator PrfA, a member of the Crp/Fnr family of transcriptional regulators. To establish a succe ...

    Listeria monocytogenes is a Gram-positive pathogen able to cause severe human infections. Its major virulence regulator is the transcriptional activator PrfA, a member of the Crp/Fnr family of transcriptional regulators. To establish a successful L. monocytogenes infection, the PrfA protein needs to be in an active conformation, either by binding the cognate inducer glutathione (GSH) or by possessing amino acid substitutions rendering the protein constitutively active (PrfA*). By a yet unknown mechanism, PTS-sugars repress the activity of PrfA. We therefore undertook a transposon-based approach to identify the mechanism by which PTS-sugars repress PrfA activity. For this, we screened a transposon mutant bank to identify clones able to grow in presence of glucose-6-phosphate as a sole carbon source. Surprisingly, most of the isolated transposon mutants also carried amino acid substitutions in PrfA. In transposon-free strains, the PrfA amino-acid substitution mutants displayed growth, virulence factor expression, infectivity and DNA binding, agreeing with previously identified PrfA* mutants. Hence, the initial growth phenotype observed in the isolated clone was due to the amino acid substitution in PrfA and unrelated to the loci inactivated by the transposon mutant. Finally, we provide structural evidence for the existence of an intermediate-activated PrfA state, which gives new insights into PrfA protein activation. IMPORTANCE The Gram-positive bacterium Listeria monocytogenes is a human pathogen mainly affecting elderly, immunocompromised people and pregnant women. It can lead to meningoencephalitis, septicaemia and abortion. The major virulence regulator in L. monocytogenes is the PrfA protein, a transcriptional activator. Using a growth-based selection strategy, we identified mutations in the PrfA protein leading to constitutively active virulence factor expression. We provide structural evidence for the existence of an intermediate-activated PrfA state, which gives new insights into PrfA protein activation.


    Organizational Affiliation

    Department of Molecular Biology Department of Chemistry Umeå Centre for Microbial research (UCMR) Department of Medical Biochemistry and Biophysics Molecular Infection Medicine, Sweden (MIMS), Umeå University, 901 87 Umeå, Sweden.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Listeriolysin regulatory protein
A, B
237Listeria monocytogenesMutation(s): 1 
Gene Names: prfa_2DYZ77_02819
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IPA
Query on IPA

Download CCD File 
A, B
ISOPROPYL ALCOHOL
C3 H8 O
KFZMGEQAYNKOFK-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.69 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.152 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.516α = 90
b = 88.571β = 90
c = 115.955γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swedish Research CouncilSweden--

Revision History 

  • Version 1.0: 2020-04-01
    Type: Initial release
  • Version 1.1: 2020-05-20
    Changes: Database references