5WDA

Structure of the PulG pseudopilus

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.00 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Structure of the calcium-dependent type 2 secretion pseudopilus.

Lopez-Castilla, A., Thomassin, J.L., Bardiaux, B., Zheng, W., Nivaskumar, M., Yu, X., Nilges, M., Egelman, E.H., Izadi-Pruneyre, N., Francetic, O.

(2017) Nat Microbiol 2: 1686-1695

  • DOI: 10.1038/s41564-017-0041-2
  • Primary Citation of Related Structures:  
    5O2Y, 5WDA

  • PubMed Abstract: 

    • Many Gram-negative bacteria use type 2 secretion systems (T2SSs) to secrete proteins involved in virulence and adaptation. Transport of folded proteins via T2SS nanomachines requires the assembly of inner membrane-anchored fibres called pseudopili. Although efficient pseudopilus assembly is essential for protein secretion, structure-based functional analyses are required to unravel the mechanistic link between these processes ...

    Many Gram-negative bacteria use type 2 secretion systems (T2SSs) to secrete proteins involved in virulence and adaptation. Transport of folded proteins via T2SS nanomachines requires the assembly of inner membrane-anchored fibres called pseudopili. Although efficient pseudopilus assembly is essential for protein secretion, structure-based functional analyses are required to unravel the mechanistic link between these processes. Here, we report an atomic model for a T2SS pseudopilus from Klebsiella oxytoca, obtained by fitting the NMR structure of its calcium-bound subunit PulG into the ~5-Å-resolution cryo-electron microscopy reconstruction of assembled fibres. This structure reveals the comprehensive network of inter-subunit contacts and unexpected features, including a disordered central region of the PulG helical stem, and highly flexible C-terminal residues on the fibre surface. NMR, mutagenesis and functional analyses highlight the key role of calcium in PulG folding and stability. Fibre disassembly in the absence of calcium provides a basis for pseudopilus length control, essential for protein secretion, and supports the Archimedes screw model for the type 2 secretion mechanism.

    Organizational Affiliation: 

    Biochemistry of Macromolecular Interactions Unit, Department of Structural Biology and Chemistry, Institut Pasteur, CNRS ERL6002, 28 rue du Dr Roux, 75724, Paris, France. olivera.francetic@pasteur.fr.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
General secretion pathway protein G
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y
134Klebsiella oxytocaMutation(s): 0 
Gene Names: pulG, AB185_31145, SAMEA2273639_02747
Membrane Entity: Yes 
UniProt
Find proteins for A0A0G3SCW3 (Klebsiella oxytoca)
Explore A0A0G3SCW3 
Go to UniProtKB:  A0A0G3SCW3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0G3SCW3
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA
Download Ideal Coordinates CCD File 
AA [auth B],
BA [auth C],
CA [auth D],
DA [auth E],
EA [auth F],
AA [auth B],
BA [auth C],
CA [auth D],
DA [auth E],
EA [auth F],
FA [auth G],
GA [auth H],
HA [auth I],
IA [auth J],
JA [auth K],
KA [auth L],
LA [auth M],
MA [auth N],
NA [auth O],
OA [auth P],
PA [auth Q],
QA [auth R],
RA [auth S],
SA [auth T],
TA [auth U],
UA [auth V],
VA [auth W],
WA [auth X],
XA [auth Y],
Z [auth A]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MEA
Query on MEA
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y
L-PEPTIDE LINKINGC10 H13 N O2PHE
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.00 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

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View more in-depth experimental data

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM122510
Agence Nationale de la RechercheFranceANR-14-CE09-0004
European Union (EU)European UnionFP7-IDEAS-ERC 294809

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-25
    Type: Initial release
  • Version 1.1: 2017-12-13
    Changes: Database references
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence