Type IV-like competence pilin TTHA1222 from Thermus thermophilus

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

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This is version 1.2 of the entry. See complete history


Structures of Type Iv Pilins from Thermus Thermophilus Demonstrate Similarities with Type II Secretion System Pseudopilins

Karuppiah, V.Thistlethwaite, A.Derrick, J.P.

(2016) J Struct Biol 196: 375

  • DOI: https://doi.org/10.1016/j.jsb.2016.08.006
  • Primary Citation of Related Structures:  
    5G23, 5G24, 5G25, 5G2F

  • PubMed Abstract: 

    Type IV pilins are proteins which form polymers that extend from the surface of the bacterial cell; they are involved in mediating a wide variety of functions, including adhesion, motility and natural competence. Here we describe the determination of the crystal structures of three type IVa pilins proteins from the thermophile Thermus thermophilus. They form part of a cluster of pilus-like proteins within the genome; our results show that one, Tt1222, is very closely related to the main structural type IV pilin, PilA4. The other two, Tt1218 and Tt1219, also adopt canonical pilin-like folds but, interestingly, are most closely related to the structures of the type II secretion system pseudopilins, EpsI/GspI and XcpW/GspJ. GspI and GspJ have been shown to form a complex with another pseudopilin, GspK, and this heterotrimeric complex is known to play a key role in initiating assembly of a pseudopilus which is thought to drive the secretion process. The structural similarity of Tt1218 and Tt1219 to GspI and GspJ suggests that they might work in a similar way, to deliver functions associated with type IV pili in T. thermophilus, such as natural competence.

  • Organizational Affiliation

    Michael Smith Building, Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
95Thermus thermophilus HB8Mutation(s): 0 
Find proteins for Q5SIZ2 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SIZ2 
Go to UniProtKB:  Q5SIZ2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SIZ2
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.38α = 90
b = 84.38β = 90
c = 97.19γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-09-14
    Type: Initial release
  • Version 1.1: 2016-09-28
    Changes: Database references
  • Version 1.2: 2016-12-07
    Changes: Database references