5XFS

Crystal structure of PE8-PPE15 in complex with EspG5 from M. tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis of the PE-PPE protein interaction in Mycobacterium tuberculosis.

Chen, X.Cheng, H.F.Zhou, J.Chan, C.Y.Lau, K.F.Tsui, S.K.Au, S.W.

(2017) J. Biol. Chem. 292: 16880-16890

  • DOI: 10.1074/jbc.M117.802645

  • PubMed Abstract: 
  • <i>Mycobacterium tuberculosis </i> ( <i>Mtb </i>), the causative agent of tuberculosis, has developed multiple strategies to adapt to the human host. The five type VII secretion systems, ESX-1-5, direct the export of many virulence-promoting protein ...

    Mycobacterium tuberculosis ( Mtb ), the causative agent of tuberculosis, has developed multiple strategies to adapt to the human host. The five type VII secretion systems, ESX-1-5, direct the export of many virulence-promoting protein effectors across the complex mycobacterial cell wall. One class of ESX substrates is the PE-PPE family of proteins, which is unique to mycobacteria and essential for infection, antigenic variation, and host-pathogen interactions. The genome of Mtb encodes 168 PE-PPE proteins. Many of them are thought to be secreted through ESX-5 secretion system and to function in pairs. However, understanding of the specific pairing of PE-PPE proteins and their structure-function relationship is limited by the challenging purification of many PE-PPE proteins, and our knowledge of the PE-PPE interactions therefore has been restricted to the PE25-PPE41 pair and its complex with the ESX-5 secretion system chaperone EspG5. Here, we report the crystal structure of a new PE-PPE pair, PE8-PPE15, in complex with EspG5. Our structure revealed that the EspG5-binding sites on PPE15 are relatively conserved among Mtb PPE proteins, suggesting that EspG5-PPE15 represents a more typical model for EspG5-PPE interactions than EspG5-PPE41. A structural comparison with the PE25-PPE41 complex disclosed conformational changes in the four-helix bundle structure and a unique binding mode in the PE8-PPE15 pair. Moreover, homology-modeling and mutagenesis studies further delineated the molecular determinants of the specific PE-PPE interactions. These findings help develop an atomic algorithm of ESX-5 substrate recognition and PE-PPE pairing.


    Organizational Affiliation

    the School of Biomedical Sciences, Chinese University of Hong Kong, Hong Kong, China.,From the Centre for Protein Science and Crystallography, School of Life Sciences, shannon-au@cuhk.edu.hk.,From the Centre for Protein Science and Crystallography, School of Life Sciences.,the Department of Microbiology, and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PE family protein PE8
A
104Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: PE8
Find proteins for L7N667 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  L7N667
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PPE family protein PPE15
B
202Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: PPE15 (mper1)
Find proteins for P9WI31 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WI31
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
ESX-5 secretion-associated protein EspG5
C
308Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: espG5
Find proteins for O53943 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  O53943
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 54.740α = 90.00
b = 69.960β = 90.00
c = 203.549γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata processing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-04-11 
  • Released Date: 2017-08-30 
  • Deposition Author(s): Chen, X., Au, S.W.N.

Funding OrganizationLocationGrant Number
Health and Medical Research FundHong Kong12110602

Revision History 

  • Version 1.0: 2017-08-30
    Type: Initial release
  • Version 1.1: 2017-12-06
    Type: Database references