6H2E

Structure of the soluble AhlC of the tripartite alpha-pore forming toxin, AHL, from Aeromonas hydrophila.

• PDB DOI:  https://doi.org/10.2210/pdb6H2E/pdb

• Classification: TOXIN
• Organism(s): Aeromonas hydrophila subsp. hydrophila AL09-71
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 
• Membrane Protein: Yes  mpstruc


• Deposited: 2018-07-13 Released: 2019-07-10 
• Deposition Author(s): Churchill-Angus, A.M., Wilson, J.S., Baker, P.J.
• Funding Organization(s): Biotechnology and Biological Sciences Research Council

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.35 Å
• R-Value Free: 0.274 
• R-Value Work: 0.227 
• R-Value Observed: 0.229 

Literature

Identification and structural analysis of the tripartite alpha-pore forming toxin of Aeromonas hydrophila.

Wilson, J.S., Churchill-Angus, A.M., Davies, S.P., Sedelnikova, S.E., Tzokov, S.B., Rafferty, J.B., Bullough, P.A., Bisson, C., Baker, P.J.

(2019) Nat Commun 10: 2900-2900

• PubMed: 31263098 
• DOI: https://doi.org/10.1038/s41467-019-10777-x
• Primary Citation of Related Structures:  
  6GRJ, 6GRK, 6H2D, 6H2E, 6H2F, 6R1J


• PubMed Abstract: 
  

The alpha helical CytolysinA family of pore forming toxins (α-PFT) contains single, two, and three component members. Structures of the single component Eschericia coli ClyA and the two component Yersinia enterolytica YaxAB show both undergo conformational changes from soluble to pore forms, and oligomerization to produce the active pore. Here we identify tripartite α-PFTs in pathogenic Gram negative bacteria, including Aeromonas hydrophila (AhlABC). We show that the AhlABC toxin requires all three components for maximal cell lysis. We present structures of pore components which describe a bi-fold hinge mechanism for soluble to pore transition in AhlB and a contrasting tetrameric assembly employed by soluble AhlC to hide their hydrophobic membrane associated residues. We propose a model of pore assembly where the AhlC tetramer dissociates, binds a single membrane leaflet, recruits AhlB promoting soluble to pore transition, prior to AhlA binding to form the active hydrophilic lined pore.

---

Organizational Affiliation: 

Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield, South Yorkshire, S10 2TN, UK. [e-mail].

Biological Assembly 1  

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 58.86 kDa 
• Atom Count: 3,866 
• Modelled Residue Count: 513 
• Deposited Residue Count: 548 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
AhlC	A [auth P], B [auth Q]	274	Aeromonas hydrophila subsp. hydrophila AL09-71	Mutation(s): 0  Gene Names: V469_08880 Membrane Entity: Yes
UniProt
Find proteins for A0KLE2 (Aeromonas hydrophila subsp. hydrophila (strain ATCC 7966 / DSM 30187 / BCRC 13018 / CCUG 14551 / JCM 1027 / KCTC 2358 / NCIMB 9240 / NCTC 8049)) Explore A0KLE2  Go to UniProtKB:  A0KLE2

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.35 Å
• R-Value Free: 0.274 
• R-Value Work: 0.227 
• R-Value Observed: 0.229 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 134.71	α = 90
b = 134.71	β = 90
c = 145.28	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
xia2	data reduction
Aimless	data scaling
SHELXDE	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2019-07-10 
Deposition Author(s): Churchill-Angus, A.M., Wilson, J.S., Baker, P.J.

---

Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council	United Kingdom	BB/F016832/1

Revision History  

• Version 1.0: 2019-07-10
  Type: Initial release
  
• Version 1.1: 2019-07-17
  Changes: Data collection, Database references