Biological Assembly 1  

 3D View: Structure

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Cyclic - C15  (3D View)
Global Stoichiometry: Hetero 45-mer - A15B15C15 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 1746711.13 
• Atom Count: 85185 
• Residue Count: 16200 
• Unique protein chains: 3

6HCG

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

• DOI: 10.2210/pdb6HCG/pdb
• EMDataResource: EMD-0193

• Classification: PROTEIN TRANSPORT
• Organism(s): Klebsiella pneumoniae subsp. pneumoniae (strain HS11286)
• Expression System: Escherichia coli


• Deposited: 2018-08-15 Released: 2019-11-27 
• Deposition Author(s): Chernyatina, A.A., Low, H.H.
• Funding Organization(s): Wellcome Trust 

---

Experimental Data Snapshot

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

Literature

Core architecture of a bacterial type II secretion system.

Chernyatina, A.A., Low, H.H.

(2019) Nat Commun 10: 5437-5437

• PubMed: 31780649 
• 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 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. [e-mail].,Department of Life Sciences, Imperial College, London, SW7 2AZ, UK.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Type II secretion system protein D	A, B, C, D, E, F, G, H, I, J, K, L, M, N, O	657	Klebsiella 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
Molecule	Chains	Sequence Length	Organism	Details
Pullulanase	P, Q, R, S, T, U, V, W, X, Y, Z, a, b, c, d	143	Klebsiella 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
Molecule	Chains	Sequence Length	Organism	Details
Pectic enzymes secretion protein OutC	e, f, g, h, i, j, k, l, m, n, o, p, q, r, s	280	Klebsiella 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

Entry History & Funding Information

Deposition Data

• Deposited Date: 2018-08-15 
• Released Date: 2019-11-27 
• Deposition Author(s): Chernyatina, A.A., Low, H.H.

---

Funding Organization	Location	Grant Number
Wellcome Trust	United Kingdom	200074/Z/15/Z

Revision History 

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