4RCL

Structure of EspG3 chaperone from the type VII (ESX-3) secretion system, space group P43212


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.233 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural Variability of EspG Chaperones from Mycobacterial ESX-1, ESX-3, and ESX-5 Type VII Secretion Systems.

Tuukkanen, A.T.Freire, D.Chan, S.Arbing, M.A.Reed, R.W.Evans, T.J.Zenkeviciute, G.Kim, J.Kahng, S.Sawaya, M.R.Chaton, C.T.Wilmanns, M.Eisenberg, D.Parret, A.H.A.Korotkov, K.V.

(2019) J Mol Biol 431: 289-307

  • DOI: https://doi.org/10.1016/j.jmb.2018.11.003
  • Primary Citation of Related Structures:  
    4L4W, 4RCL, 5DLB, 5SXL, 5VBA

  • PubMed Abstract: 

    Type VII secretion systems (ESX) are responsible for transport of multiple proteins in mycobacteria. How different ESX systems achieve specific secretion of cognate substrates remains elusive. In the ESX systems, the cytoplasmic chaperone EspG forms complexes with heterodimeric PE-PPE substrates that are secreted from the cells or remain associated with the cell surface. Here we report the crystal structure of the EspG 1 chaperone from the ESX-1 system determined using a fusion strategy with T4 lysozyme. EspG 1 adopts a quasi 2-fold symmetric structure that consists of a central β-sheet and two α-helical bundles. In addition, we describe the structures of EspG 3 chaperones from four different crystal forms. Alternate conformations of the putative PE-PPE binding site are revealed by comparison of the available EspG 3 structures. Analysis of EspG 1 , EspG 3 , and EspG 5 chaperones using small-angle X-ray scattering reveals that EspG 1 and EspG 3 chaperones form dimers in solution, which we observed in several of our crystal forms. Finally, we propose a model of the ESX-3 specific EspG 3 -PE5-PPE4 complex based on the small-angle X-ray scattering analysis.


  • Organizational Affiliation

    European Molecular Biology Laboratory, Hamburg Unit, Hamburg 22607, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ESPG3
A, B
295Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: MSMEG_0622MSMEI_0606
UniProt
Find proteins for A0QQ45 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0QQ45 
Go to UniProtKB:  A0QQ45
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0QQ45
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.233 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.679α = 90
b = 92.679β = 90
c = 158.85γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-16
    Type: Initial release
  • Version 1.1: 2018-12-05
    Changes: Data collection, Database references
  • Version 1.2: 2019-03-06
    Changes: Data collection, Database references
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Refinement description