6RAE

Structural analysis of the Salmonella type III secretion system ATPase InvC


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.166 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural analysis of ligand-bound states of the Salmonella type III secretion system ATPase InvC.

Bernal, I.Romermann, J.Flacht, L.Lunelli, M.Uetrecht, C.Kolbe, M.

(2019) Protein Sci 28: 1888-1901

  • DOI: 10.1002/pro.3704
  • Primary Citation of Related Structures:  
    6RAD, 6RAE, 6SDX

  • PubMed Abstract: 
  • Translocation of virulence effector proteins through the type III secretion system (T3SS) is essential for the virulence of many medically relevant Gram-negative bacteria. The T3SS ATPases are conserved components that specifically recognize chaperone-effector complexes and energize effector secretion through the system ...

    Translocation of virulence effector proteins through the type III secretion system (T3SS) is essential for the virulence of many medically relevant Gram-negative bacteria. The T3SS ATPases are conserved components that specifically recognize chaperone-effector complexes and energize effector secretion through the system. It is thought that functional T3SS ATPases assemble into a cylindrical structure maintained by their N-terminal domains. Using size-exclusion chromatography coupled to multi-angle light scattering and native mass spectrometry, we show that in the absence of the N-terminal oligomerization domain the Salmonella T3SS ATPase InvC can form monomers and dimers in solution. We also present for the first time a 2.05 å resolution crystal structure of InvC lacking the oligomerization domain (InvCΔ79) and map the amino acids suggested for ATPase intersubunit interaction, binding to other T3SS proteins and chaperone-effector recognition. Furthermore, we validate the InvC ATP-binding site by co-crystallization of InvCΔ79 with ATPγS (2.65 å) and ADP (2.80 å). Upon ATP-analogue recognition, these structures reveal remodeling of the ATP-binding site and conformational changes of two loops located outside of the catalytic site. Both loops face the central pore of the predicted InvC cylinder and are essential for the function of the T3SS ATPase. Our results present a fine functional and structural correlation of InvC and provide further details of the homo-oligomerization process and ATP-dependent conformational changes underlying the T3SS ATPase activity.


    Organizational Affiliation

    MIN-Faculty University Hamburg, Hamburg, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Secretory apparatus ATP synthase (Associated with virulence)A363Salmonella enterica subsp. enterica serovar Typhimurium str. SL1344Mutation(s): 0 
Gene Names: invCSL1344_2873
EC: 7.4.2.8
UniProt
Find proteins for P0A1B9 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1B9 
Go to UniProtKB:  P0A1B9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A1B9
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
B [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.166 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.292α = 90
b = 106.292β = 90
c = 73.5γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Communitys Seventh Framework ProgrammeGermany311374

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-21
    Type: Initial release
  • Version 1.1: 2019-09-25
    Changes: Data collection, Database references