4KK7

Structure of EccB1 from the type VII (ESX-1) secretion system of Mycobacterium tuberculosis.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.68 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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This is version 1.2 of the entry. See complete history


Literature

Structures of EccB1 and EccD1 from the core complex of the mycobacterial ESX-1 type VII secretion system.

Wagner, J.M.Chan, S.Evans, T.J.Kahng, S.Kim, J.Arbing, M.A.Eisenberg, D.Korotkov, K.V.

(2016) BMC Struct Biol 16: 5-5

  • DOI: https://doi.org/10.1186/s12900-016-0056-6
  • Primary Citation of Related Structures:  
    4KK7, 4KV2, 4KV3, 5CYU

  • PubMed Abstract: 

    The ESX-1 type VII secretion system is an important determinant of virulence in pathogenic mycobacteria, including Mycobacterium tuberculosis. This complicated molecular machine secretes folded proteins through the mycobacterial cell envelope to subvert the host immune response. Despite its important role in disease very little is known about the molecular architecture of the ESX-1 secretion system. This study characterizes the structures of the soluble domains of two conserved core ESX-1 components - EccB1 and EccD1. The periplasmic domain of EccB1 consists of 4 repeat domains and a central domain, which together form a quasi 2-fold symmetrical structure. The repeat domains of EccB1 are structurally similar to a known peptidoglycan binding protein suggesting a role in anchoring the ESX-1 system within the periplasmic space. The cytoplasmic domain of EccD1has a ubiquitin-like fold and forms a dimer with a negatively charged groove. These structures represent a major step towards resolving the molecular architecture of the entire ESX-1 assembly and may contribute to ESX-1 targeted tuberculosis intervention strategies.


  • Organizational Affiliation

    Department of Molecular & Cellular Biochemistry and Center for Structural Biology, University of Kentucky, 741 South Limestone, Lexington, KY, 40536, USA. jonw7782@gmail.com.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ESX-1 secretion system protein eccB1395Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: Rv3869RVBD_3869
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.68 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 31.7α = 90
b = 110.63β = 90
c = 110.51γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
SHARPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
SERGUIdata collection
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-19
    Type: Initial release
  • Version 1.1: 2016-03-23
    Changes: Database references
  • Version 1.2: 2024-11-06
    Changes: Data collection, Database references, Derived calculations, Structure summary