4NKG

Crystal structure of SspH1 LRR domain in complex PKN1 HR1b domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of an SspH1-PKN1 Complex Reveals the Basis for Host Substrate Recognition and Mechanism of Activation for a Bacterial E3 Ubiquitin Ligase.

Keszei, A.F.Tang, X.McCormick, C.Zeqiraj, E.Rohde, J.R.Tyers, M.Sicheri, F.

(2014) Mol.Cell.Biol. 34: 362-373

  • DOI: 10.1128/MCB.01360-13
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • IpaH proteins are bacterium-specific E3 enzymes that function as type three secretion system (T3SS) effectors in Salmonella, Shigella, and other Gram-negative bacteria. IpaH enzymes recruit host substrates for ubiquitination via a leucine-rich repeat ...

    IpaH proteins are bacterium-specific E3 enzymes that function as type three secretion system (T3SS) effectors in Salmonella, Shigella, and other Gram-negative bacteria. IpaH enzymes recruit host substrates for ubiquitination via a leucine-rich repeat (LRR) domain, which can inhibit the catalytic domain in the absence of substrate. The basis for substrate recognition and the alleviation of autoinhibition upon substrate binding is unknown. Here, we report the X-ray structure of Salmonella SspH1 in complex with human PKN1. The LRR domain of SspH1 interacts specifically with the HR1b coiled-coil subdomain of PKN1 in a manner that sterically displaces the catalytic domain from the LRR domain, thereby activating catalytic function. SspH1 catalyzes the ubiquitination and proteasome-dependent degradation of PKN1 in cells, which attenuates androgen receptor responsiveness but not NF-κB activity. These regulatory features are conserved in other IpaH-substrate interactions. Our results explain the mechanism whereby substrate recognition and enzyme autoregulation are coupled in this class of bacterial ubiquitin ligases.


    Organizational Affiliation

    Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
E3 ubiquitin-protein ligase sspH1
A, C
246Salmonella typhimurium (strain 14028s / SGSC 2262)Mutation(s): 0 
Gene Names: sspH1
EC: 2.3.2.27
Find proteins for D0ZVG2 (Salmonella typhimurium (strain 14028s / SGSC 2262))
Go to UniProtKB:  D0ZVG2
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase N1
B, D
82Homo sapiensMutation(s): 0 
Gene Names: PKN1 (PAK1, PKN, PRK1, PRKCL1)
EC: 2.7.11.13
Find proteins for Q16512 (Homo sapiens)
Go to Gene View: PKN1
Go to UniProtKB:  Q16512
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEZ
Query on HEZ

Download SDF File 
Download CCD File 
A, C
HEXANE-1,6-DIOL
C6 H14 O2
XXMIOPMDWAUFGU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.209 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 167.623α = 90.00
b = 167.623β = 90.00
c = 89.143γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXrefinement
HKL-2000data collection
PHASERphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-12-11
    Type: Initial release
  • Version 1.1: 2013-12-25
    Type: Database references
  • Version 1.2: 2014-01-22
    Type: Database references