5SXL

Structure of EspG3 chaperone from the type VII (ESX-3) secretion system, space group P3221


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.46 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.206 

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: 10.1016/j.jmb.2018.11.003
  • Primary Citation of Related Structures:  

  • 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 ...

    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.,Department of Molecular & Cellular Biochemistry, and Center for Structural Biology, University of Kentucky, Lexington, KY 40536, USA. Electronic address: kkorotkov@uky.edu.,UCLA-DOE Institute, University of California Los Angeles, Los Angeles, CA 90095, USA.,Department of Molecular & Cellular Biochemistry, and Center for Structural Biology, University of Kentucky, Lexington, KY 40536, USA.,European Molecular Biology Laboratory, Hamburg Unit, Hamburg 22607, Germany. Electronic address: parret@embl-hamburg.de.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ESX-3 secretion-associated protein EspG3
A
295Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155)Mutation(s): 0 
Gene Names: espG3
Find proteins for A0QQ45 (Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155))
Go to UniProtKB:  A0QQ45
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.46 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.206 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 59.150α = 90.00
b = 59.150β = 90.00
c = 183.100γ = 120.00
Software Package:
Software NamePurpose
XSCALEdata scaling
SHARPphasing
PDB_EXTRACTdata extraction
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-08-09 
  • Released Date: 2016-08-24 
  • Deposition Author(s): Korotkov, K.V.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01AI119022

Revision History 

  • Version 1.0: 2016-08-24
    Type: Initial release
  • Version 1.1: 2017-09-13
    Type: Author supporting evidence, Derived calculations
  • Version 1.2: 2018-12-05
    Type: Data collection, Database references
  • Version 1.3: 2019-03-06
    Type: Data collection, Database references