3FAV

Structure of the CFP10-ESAT6 complex from Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.199 

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This is version 1.2 of the entry. See complete history


Literature

WXG100 protein superfamily consists of three subfamilies and exhibits an alpha-helical C-terminal conserved residue pattern.

Poulsen, C.Panjikar, S.Holton, S.J.Wilmanns, M.Song, Y.H.

(2014) PLoS One 9: e89313-e89313

  • DOI: 10.1371/journal.pone.0089313
  • Primary Citation of Related Structures:  
    3GVM, 3GWK, 3FAV

  • PubMed Abstract: 
  • Members of the WXG100 protein superfamily form homo- or heterodimeric complexes. The most studied proteins among them are the secreted T-cell antigens CFP-10 (10 kDa culture filtrate protein, EsxB) and ESAT-6 (6 kDa early secreted antigen target, EsxA) from Mycobacterium tuberculosis ...

    Members of the WXG100 protein superfamily form homo- or heterodimeric complexes. The most studied proteins among them are the secreted T-cell antigens CFP-10 (10 kDa culture filtrate protein, EsxB) and ESAT-6 (6 kDa early secreted antigen target, EsxA) from Mycobacterium tuberculosis. They are encoded on an operon within a gene cluster, named as ESX-1, that encodes for the Type VII secretion system (T7SS). WXG100 proteins are secreted in a full-length form and it is known that they adopt a four-helix bundle structure. In the current work we discuss the evolutionary relationship between the homo- and heterodimeric WXG100 proteins, the basis of the oligomeric state and the key structural features of the conserved sequence pattern of WXG100 proteins. We performed an iterative bioinformatics analysis of the WXG100 protein superfamily and correlated this with the atomic structures of the representative WXG100 proteins. We find, firstly, that the WXG100 protein superfamily consists of three subfamilies: CFP-10-, ESAT-6- and sagEsxA-like proteins (EsxA proteins similar to that of Streptococcus agalactiae). Secondly, that the heterodimeric complexes probably evolved from a homodimeric precursor. Thirdly, that the genes of hetero-dimeric WXG100 proteins are always encoded in bi-cistronic operons and finally, by combining the sequence alignments with the X-ray data we identify a conserved C-terminal sequence pattern. The side chains of these conserved residues decorate the same side of the C-terminal α-helix and therefore form a distinct surface. Our results lead to a putatively extended T7SS secretion signal which combines two reported T7SS recognition characteristics: Firstly that the T7SS secretion signal is localized at the C-terminus of T7SS substrates and secondly that the conserved residues YxxxD/E are essential for T7SS activity. Furthermore, we propose that the specific α-helical surface formed by the conserved sequence pattern including YxxxD/E motif is a key component of T7SS-substrate recognition.


    Organizational Affiliation

    EMBL-Hamburg, Hamburg, Germany ; University Luebeck, Institute of Physics, Luebeck, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ESAT-6-like protein esxBA, C101Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: esxBcfp10lhpmtsA10Rv3874MTV027.09
UniProt
Find proteins for P9WNK5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WNK5 
Go to UniProtKB:  P9WNK5
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
6 kDa early secretory antigenic targetB, D94Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: esxAesaT6Rv3875MTV027.10
UniProt
Find proteins for P9WNK7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WNK7 
Go to UniProtKB:  P9WNK7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 160.34α = 90
b = 23.93β = 94.36
c = 83.86γ = 90
Software Package:
Software NamePurpose
XSCALEdata processing
PHENIXrefinement
PDB_EXTRACTdata extraction
MAR345dtbdata collection
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-08-13
    Changes: Database references