6HCG

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.3 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

  • 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 pathog ...

    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.,Department of Life Sciences, Imperial College, London, SW7 2AZ, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Type II secretion system protein D
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O
657Klebsiella pneumoniae subsp. pneumoniae (strain HS11286)Mutation(s): 0 
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Type II Secretion Systems
Protein: 
bacterial type II secretion system, core architecture
Find proteins for A0A0H3GIG3 (Klebsiella pneumoniae subsp. pneumoniae (strain HS11286))
Go to UniProtKB:  A0A0H3GIG3
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Pullulanase
P, Q, R, S, T, U, V, W, X, Y, Z, a, b, c, d
143Klebsiella pneumoniae subsp. pneumoniae (strain HS11286)Mutation(s): 0 
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Type II Secretion Systems
Protein: 
bacterial type II secretion system, core architecture
Find proteins for A0A0H3GNG8 (Klebsiella pneumoniae subsp. pneumoniae (strain HS11286))
Go to UniProtKB:  A0A0H3GNG8
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Pectic enzymes secretion protein OutC
e, f, g, h, i, j, k, l, m, n, o, p, q, r, s
280Klebsiella pneumoniae subsp. pneumoniae (strain HS11286)Mutation(s): 0 
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Type II Secretion Systems
Protein: 
bacterial type II secretion system, core architecture
Find proteins for A0A0H3GMS7 (Klebsiella pneumoniae subsp. pneumoniae (strain HS11286))
Go to UniProtKB:  A0A0H3GMS7
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.3 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


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

Revision History 

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