2KKX

Solution Structure of C-terminal domain of reduced NleG2-3 (residues 90-191) from Pathogenic E. coli O157:H7. Northeast Structural Genomics Consortium and Midwest Center for Structural Genomics target ET109A


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

NleG Type 3 effectors from enterohaemorrhagic Escherichia coli are U-Box E3 ubiquitin ligases.

Wu, B.Skarina, T.Yee, A.Jobin, M.C.Dileo, R.Semesi, A.Fares, C.Lemak, A.Coombes, B.K.Arrowsmith, C.H.Singer, A.U.Savchenko, A.

(2010) Plos Pathog. 6: e1000960-e1000960

  • DOI: 10.1371/journal.ppat.1000960
  • Primary Citation of Related Structures:  2KKY

  • PubMed Abstract: 
  • NleG homologues constitute the largest family of Type 3 effectors delivered by pathogenic E. coli, with fourteen members in the enterohaemorrhagic (EHEC) O157:H7 strain alone. Identified recently as part of the non-LEE-encoded (Nle) effector set, thi ...

    NleG homologues constitute the largest family of Type 3 effectors delivered by pathogenic E. coli, with fourteen members in the enterohaemorrhagic (EHEC) O157:H7 strain alone. Identified recently as part of the non-LEE-encoded (Nle) effector set, this family remained uncharacterised and shared no sequence homology to other proteins including those of known function. The C-terminal domain of NleG2-3 (residues 90 to 191) is the most conserved region in NleG proteins and was solved by NMR. Structural analysis of this structure revealed the presence of a RING finger/U-box motif. Functional assays demonstrated that NleG2-3 as well as NleG5-1, NleG6-2 and NleG9' family members exhibited a strong autoubiquitination activity in vitro; a characteristic usually expressed by eukaryotic ubiquitin E3 ligases. When screened for activity against a panel of 30 human E2 enzymes, the NleG2-3 and NleG5-1 homologues showed an identical profile with only UBE2E2, UBE2E3 and UBE2D2 enzymes supporting NleG activity. Fluorescence polarization analysis yielded a binding affinity constant of 56+/-2 microM for the UBE2D2/NleG5-1 interaction, a value comparable with previous studies on E2/E3 affinities. The UBE2D2 interaction interface on NleG2-3 defined by NMR chemical shift perturbation and mutagenesis was shown to be generally similar to that characterised for human RING finger ubiquitin ligases. The alanine substitutions of UBE2D2 residues Arg5 and Lys63, critical for activation of eukaryotic E3 ligases, also significantly decreased both NleG binding and autoubiquitination activity. These results demonstrate that bacteria-encoded NleG effectors are E3 ubiquitin ligases analogous to RING finger and U-box enzymes in eukaryotes.


    Related Citations: 
    • A novel strategy for NMR resonance assignment and protein structure determination.
      Lemak, A.,Gutmanas, A.,Chitayat, S.,Karra, M.,Fares, C.,Sunnerhagen, M.,Arrowsmith, C.H.
      (2011) J.Biomol.Nmr 49: 27


    Organizational Affiliation

    Division of Cancer Genomics and Proteomics, Ontario Cancer Institute, Toronto, Ontario, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized protein ECs2156
A
102Escherichia coli O157:H7N/A
Find proteins for Q8X509 (Escherichia coli O157:H7)
Go to UniProtKB:  Q8X509
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2KKX Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2009-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-01-18
    Type: Database references
  • Version 1.3: 2018-01-24
    Type: Structure summary