2.43 A Mycobacterium marinum EspB.

Experimental Data Snapshot

  • Resolution: 2.43 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Priming mycobacterial ESX-secreted protein B to form a channel-like structure.

Gijsbers, A.Vinciauskaite, V.Siroy, A.Gao, Y.Tria, G.Mathew, A.Sanchez-Puig, N.Lopez-Iglesias, C.Peters, P.J.Ravelli, R.B.G.

(2021) Curr Res Struct Biol 3: 153-164

  • DOI: https://doi.org/10.1016/j.crstbi.2021.06.001
  • Primary Citation of Related Structures:  
    7P0Z, 7P13

  • PubMed Abstract: 

    ESX-1 is a major virulence factor of Mycobacterium tuberculosis , a secretion machinery directly involved in the survival of the microorganism from the immune system defence. It disrupts the phagosome membrane of the host cell through a contact-dependent mechanism. Recently, the structure of the inner-membrane core complex of the homologous ESX-3 and ESX-5 was resolved; however, the elements involved in the secretion through the outer membrane or those acting on the host cell membrane are unknown. Protein substrates might form this missing element. Here, we describe the oligomerisation process of the ESX-1 substrate EspB, which occurs upon cleavage of its C-terminal region and is favoured by an acidic environment. Cryo-electron microscopy data shows that quaternary structure of EspB is conserved across slow growing species, but not in the fast growing M. smegmatis . EspB assembles into a channel with dimensions and characteristics suitable for the transit of ESX-1 substrates, as shown by the presence of another EspB trapped within. Our results provide insight into the structure and assembly of EspB, and suggests a possible function as a structural element of ESX-1.

  • Organizational Affiliation

    Division of Nanoscopy, Maastricht Multimodal Molecular Imaging Institute, Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, the Netherlands.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ESX-1 secretion-associated protein EspB
A, B, C, D, E
A, B, C, D, E, F, G
288Mycobacterium marinum MMutation(s): 0 
Gene Names: espBMMAR_5457
Find proteins for B2HNQ9 (Mycobacterium marinum (strain ATCC BAA-535 / M))
Explore B2HNQ9 
Go to UniProtKB:  B2HNQ9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2HNQ9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.43 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Netherlands Organisation for Scientific Research (NWO)Netherlands731.016.407
Netherlands Organisation for Scientific Research (NWO)Netherlands184.034.014
European Union (EU)European UnionNo 766970 Q-SORT
Consejo Nacional de Ciencia y Tecnologia (CONACYT)Mexico283909

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-18
    Type: Initial release
  • Version 1.1: 2021-10-13
    Changes: Data collection, Database references