7B9F

Structure of the mycobacterial ESX-5 Type VII Secretion System hexameric pore complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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This is version 1.1 of the entry. See complete history


Literature

Structure of the mycobacterial ESX-5 type VII secretion system pore complex.

Beckham, K.S.H.Ritter, C.Chojnowski, G.Ziemianowicz, D.S.Mullapudi, E.Rettel, M.Savitski, M.M.Mortensen, S.A.Kosinski, J.Wilmanns, M.

(2021) Sci Adv 7

  • DOI: https://doi.org/10.1126/sciadv.abg9923
  • Primary Citation of Related Structures:  
    7B7J, 7B9F, 7B9S

  • PubMed Abstract: 

    The ESX-5 type VII secretion system is a membrane-spanning protein complex key to the virulence of mycobacterial pathogens. However, the overall architecture of the fully assembled translocation machinery and the composition of the central secretion pore have remained unknown. Here, we present the high-resolution structure of the 2.1-megadalton ESX-5 core complex. Our structure captured a dynamic, secretion-competent conformation of the pore within a well-defined transmembrane section, sandwiched between two flexible protein layers at the cytosolic entrance and the periplasmic exit. We propose that this flexibility endows the ESX-5 machinery with large conformational plasticity required to accommodate targeted protein secretion. Compared to known secretion systems, a highly dynamic state of the pore may represent a fundamental principle of bacterial secretion machineries.


  • Organizational Affiliation

    European Molecular Biology Laboratory, Hamburg Unit, Notkestrasse 85, 22607 Hamburg, Germany.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EccE5A [auth E]400Mycobacterium xenopi RIVM700367Mutation(s): 0 
Gene Names: MXEN_09224
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
EccD5B [auth X],
D
502Mycobacterium xenopi RIVM700367Mutation(s): 0 
Gene Names: MXEN_09214
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
EccC51,392Mycobacterium xenopi RIVM700367Mutation(s): 0 
Gene Names: MXEN_04114
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
EccB5E [auth B]506Mycobacterium xenopi RIVM700367Mutation(s): 0 
Gene Names: MXEN_04109
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC2.14
MODEL REFINEMENTPHENIX1.18.2

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2021-07-07
    Type: Initial release
  • Version 1.1: 2024-05-01
    Changes: Data collection, Database references, Refinement description