6HCG

Klebsiella pneumoniae type II secretion system outer membrane complex. PulD, PulS and PulC HR domain.

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.30 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. 


Literature

Core architecture of a bacterial type II secretion system.

Chernyatina, A.A., Low, H.H.

(2019) Nat Commun 10: 5437-5437

  • DOI: 10.1038/s41467-019-13301-3
  • Primary Citation of Related Structures:  
    6HCG

  • PubMed Abstract: 

    • Bacterial type II secretion systems (T2SSs) translocate virulence factors, toxins and enzymes across the cell outer membrane. Here we use negative stain and cryo-electron microscopy to reveal the core architecture of an assembled T2SS from the pathogen Klebsiella pneumoniae ...

    Bacterial type II secretion systems (T2SSs) translocate virulence factors, toxins and enzymes across the cell outer membrane. Here we use negative stain and cryo-electron microscopy to reveal the core architecture of an assembled T2SS from the pathogen Klebsiella pneumoniae. We show that 7 proteins form a ~2.4 MDa complex that spans the cell envelope. The outer membrane complex includes the secretin PulD, with all domains modelled, and the pilotin PulS. The inner membrane assembly platform components PulC, PulE, PulL, PulM and PulN have a relative stoichiometric ratio of 2:1:1:1:1. The PulE ATPase, PulL and PulM combine to form a flexible hexameric hub. Symmetry mismatch between the outer membrane complex and assembly platform is overcome by PulC linkers spanning the periplasm, with PulC HR domains binding independently at the secretin base. Our results show that the T2SS has a highly dynamic modular architecture, with implication for pseudo-pilus assembly and substrate loading.

    Organizational Affiliation: 

    Department of Life Sciences, Imperial College, London, SW7 2AZ, UK. h.low@imperial.ac.uk.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Type II secretion system protein D
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O
657Klebsiella pneumoniaeMutation(s): 0 
Gene Names: 
Membrane Entity: Yes 
UniProt
Find proteins for A0A0H3GIG3 (Klebsiella pneumoniae subsp. pneumoniae (strain HS11286))
Explore A0A0H3GIG3 
Go to UniProtKB:  A0A0H3GIG3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H3GIG3
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Pullulanase
P,
Q,
R,
S,
T,
143Klebsiella pneumoniaeMutation(s): 0 
Gene Names: BU230_24515
UniProt
Find proteins for A0A0H3GNG8 (Klebsiella pneumoniae subsp. pneumoniae (strain HS11286))
Explore A0A0H3GNG8 
Go to UniProtKB:  A0A0H3GNG8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H3GNG8
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Pectic enzymes secretion protein OutC280Klebsiella pneumoniaeMutation(s): 0 
Gene Names: 
Membrane Entity: Yes 
UniProt
Find proteins for A0A0H3GMS7 (Klebsiella pneumoniae subsp. pneumoniae (strain HS11286))
Explore A0A0H3GMS7 
Go to UniProtKB:  A0A0H3GMS7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H3GMS7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom200074/Z/15/Z

Revision History  (Full details and data files)

  • Version 1.0: 2019-11-27
    Type: Initial release
  • Version 1.1: 2019-12-11
    Changes: Database references