7LKM

The PilB(N-terminal_P70S mutant)-PilZ complex of the Type IV pilus from Xanthomonas citri


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The PilB-PilZ-FimX regulatory complex of the Type IV pilus from Xanthomonas citri.

Llontop, E.E.Cenens, W.Favaro, D.C.Sgro, G.G.Salinas, R.K.Guzzo, C.R.Farah, C.S.

(2021) PLoS Pathog 17: e1009808-e1009808

  • DOI: https://doi.org/10.1371/journal.ppat.1009808

  • PubMed Abstract: 

    Type IV pili (T4P) are thin and flexible filaments found on the surface of a wide range of Gram-negative bacteria that undergo cycles of extension and retraction and participate in a variety of important functions related to lifestyle, defense and pathogenesis. During pilus extensions, the PilB ATPase energizes the polymerization of pilin monomers from the inner membrane. In Xanthomonas citri, two cytosolic proteins, PilZ and the c-di-GMP receptor FimX, are involved in the regulation of T4P biogenesis through interactions with PilB. In vivo fluorescence microscopy studies show that PilB, PilZ and FimX all colocalize to the leading poles of X. citri cells during twitching motility and that this colocalization is dependent on the presence of all three proteins. We demonstrate that full-length PilB, PilZ and FimX can interact to form a stable complex as can PilB N-terminal, PilZ and FimX C-terminal fragments. We present the crystal structures of two binary complexes: i) that of the PilB N-terminal domain, encompassing sub-domains ND0 and ND1, bound to PilZ and ii) PilZ bound to the FimX EAL domain within a larger fragment containing both GGDEF and EAL domains. Evaluation of PilZ interactions with PilB and the FimX EAL domain in these and previously published structures, in conjunction with mutagenesis studies and functional assays, allow us to propose an internally consistent model for the PilB-PilZ-FimX complex and its interactions with the PilM-PilN complex in the context of the inner membrane platform of the X. citri Type IV pilus.


  • Organizational Affiliation

    Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pilus biogenesis protein
A, B
173Xanthomonas citri pv. citri str. 306Mutation(s): 1 
Gene Names: pilBXAC3239
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Type IV fimbriae assembly protein
C, D
117Xanthomonas citri pv. citri str. 306Mutation(s): 0 
Gene Names: pilZXAC1133
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.063α = 90
b = 122.408β = 98.98
c = 62.73γ = 90
Software Package:
Software NamePurpose
Cootmodel building
PHENIXrefinement
XDSdata reduction
XDSdata scaling
REFMACphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Sao Paulo Research Foundation (FAPESP)Brazil2017/17303-7

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-11
    Type: Initial release
  • Version 1.1: 2021-09-01
    Changes: Database references
  • Version 1.2: 2024-04-03
    Changes: Data collection, Refinement description