3WXX

Crystal Structure of a T3SS complex from Aeromonas hydrophila

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Structure of AcrH-AopB Chaperone-Translocator Complex Reveals a Role for Membrane Hairpins in Type III Secretion System Translocon Assembly

Nguyen, V.S., Jobichen, C., Tan, K.W., Tan, Y.W., Chan, S.L., Ramesh, K., Yuan, Y., Hong, Y., Seetharaman, J., Leung, K.Y., Sivaraman, J., Mok, Y.K.

(2015) Structure 23: 2022-2031

  • DOI: 10.1016/j.str.2015.08.014
  • Primary Citation of Related Structures:  
    3WXX

  • PubMed Abstract: 

    • Type III secretion systems (T3SSs) are adopted by pathogenic bacteria for the transport of effector proteins into host cells through the translocon pore composed of major and minor translocator proteins. Both translocators require a dedicated chapero ...

    Type III secretion systems (T3SSs) are adopted by pathogenic bacteria for the transport of effector proteins into host cells through the translocon pore composed of major and minor translocator proteins. Both translocators require a dedicated chaperone for solubility. Despite tremendous efforts in the past, structural information regarding the chaperone-translocator complex and the topology of the translocon pore have remained elusive. Here, we report the crystal structure of the major translocator, AopB, from Aeromonas hydrophila AH-1 in complex with its chaperone, AcrH. Overall, the structure revealed unique interactions between the various interfaces of AopB and AcrH, with the N-terminal "molecular anchor" of AopB crossing into the "N-terminal arm" of AcrH. AopB adopts a novel fold, and its transmembrane regions form two pairs of helical hairpins. From these structural studies and associated cellular assays, we deduced the topology of the assembled T3SS translocon; both termini remain extracellular after membrane insertion.

    Organizational Affiliation: 

    Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, 117543 Singapore. Electronic address: dbsmokh@nus.edu.sg.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AcrHA, C, E, G151Aeromonas hydrophilaMutation(s): 1 
Gene Names: acrH
Find proteins for Q6TLM1 (Aeromonas hydrophila)
Explore Q6TLM1 
Go to UniProtKB:  Q6TLM1
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
AopBB, D, F, H219Aeromonas hydrophilaMutation(s): 0 
Gene Names: aopB
Find proteins for Q6TLM0 (Aeromonas hydrophila)
Explore Q6TLM0 
Go to UniProtKB:  Q6TLM0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG
Download CCD File 
G
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		A,C,E,GL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 124.662α = 90
b = 151.942β = 104.95
c = 106.253γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
Auto-Rickshawphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-10-14
    Type: Initial release
  • Version 1.1: 2015-11-11
    Changes: Database references