6GGR

Crystal structure of Salmonella zinc metalloprotease effector GtgA in complex with p65


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.097 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure-function analyses of the bacterial zinc metalloprotease effector protein GtgA uncover key residues required for deactivating NF-kappa B.

Jennings, E.Esposito, D.Rittinger, K.Thurston, T.L.M.

(2018) J. Biol. Chem. 293: 15316-15329

  • DOI: 10.1074/jbc.RA118.004255
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The closely related type III secretion system zinc metalloprotease effector proteins GtgA, GogA, and PipA are translocated into host cells during <i>Salmonella </i> infection. They then cleave nuclear factor κ-light-chain-enhancer of activated B cel ...

    The closely related type III secretion system zinc metalloprotease effector proteins GtgA, GogA, and PipA are translocated into host cells during Salmonella infection. They then cleave nuclear factor κ-light-chain-enhancer of activated B cells (NF-κB) transcription factor subunits, dampening activation of the NF-κB signaling pathway and thereby suppressing host immune responses. We demonstrate here that GtgA, GogA, and PipA cleave a subset of NF-κB subunits, including p65, RelB, and cRel but not NF-κB1 and NF-κB2, whereas the functionally similar type III secretion system effector NleC of enteropathogenic and enterohemorrhagic Escherichia coli cleaved all five NF-κB subunits. Mutational analysis of NF-κB subunits revealed that a single nonconserved residue in NF-κB1 and NF-κB2 that corresponds to the P1' residue Arg-41 in p65 prevents cleavage of these subunits by GtgA, GogA, and PipA, explaining the observed substrate specificity of these enzymes. Crystal structures of GtgA in its apo-form and in complex with the p65 N-terminal domain explained the importance of the P1' residue. Furthermore, the pattern of interactions suggested that GtgA recognizes NF-κB subunits by mimicking the shape and negative charge of the DNA phosphate backbone. Moreover, structure-based mutational analysis of GtgA uncovered amino acids that are required for the interaction of GtgA with p65, as well as those that are required for full activity of GtgA in suppressing NF-κB activation. This study therefore provides detailed and critical insight into the mechanism of substrate recognition by this family of proteins important for bacterial virulence.


    Organizational Affiliation

    From the Section of Microbiology, MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London SW7 2AZ and.,the Molecular Structure of Cell Signalling Laboratory, The Francis Crick Institute, 1 Midland Road, London NW1 1AT, United Kingdom.,From the Section of Microbiology, MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London SW7 2AZ and t.thurston@imperial.ac.uk.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcription factor p65
A
170Mus musculusMutation(s): 0 
Gene Names: Rela (Nfkb3)
Find proteins for Q04207 (Mus musculus)
Go to UniProtKB:  Q04207
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Bacteriophage virulence determinant
B
212Salmonella typhimurium (strain 14028s / SGSC 2262)Mutation(s): 0 
Gene Names: gtgA
Find proteins for A0A0F6AZI6 (Salmonella typhimurium (strain 14028s / SGSC 2262))
Go to UniProtKB:  A0A0F6AZI6
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.097 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 39.392α = 90.00
b = 85.833β = 90.00
c = 111.869γ = 90.00
Software Package:
Software NamePurpose
DIALSdata scaling
DIALSdata reduction
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
The Francis Crick InstituteUnited KingdomFC001142
Imperial College LondonUnited KingdomRSRO_P50016
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/R011834/1
Wellcome TrustUnited Kingdom102410/Z/13/ZR

Revision History 

  • Version 1.0: 2018-08-29
    Type: Initial release
  • Version 1.1: 2018-10-10
    Type: Data collection, Database references