2KEP

Solution structure of XcpT, the main component of the type 2 secretion system of Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with acceptable covalent geometry 

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This is version 1.1 of the entry. See complete history


Literature

Structure of the Pseudomonas aeruginosa XcpT pseudopilin, a major component of the type II secretion system

Alphonse, S.Durand, E.Douzi, B.Waegele, B.Darbon, H.Filloux, A.Voulhoux, R.Bernard, C.

(2009) J Struct Biol 

  • DOI: 10.1016/j.jsb.2009.09.003
  • Primary Citation of Related Structures:  
    2KEP

  • PubMed Abstract: 
  • The bacterial type II protein secretion (T2S) and type IV piliation (T4P) systems share several common features. In particular, it is well established that the T2S system requires the function of a pilus-like structure, called pseudopilus, which is built ...

    The bacterial type II protein secretion (T2S) and type IV piliation (T4P) systems share several common features. In particular, it is well established that the T2S system requires the function of a pilus-like structure, called pseudopilus, which is built upon assembly of pilin-like subunits, called pseudopilins. Pilins and pseudopilins have a hydrophobic N-terminal region, which precedes an extended hydrophilic C-terminal region. In the case of pilins, it was shown that oligomerisation and formation of helical fibers, takes place through interaction between the hydrophobic domains. XcpT, is the most abundant protein of the Pseudomonas aeruginosa T2S, and was proposed to be the main component in the pseudopilus. In this study we present the high-resolution NMR structure of the hydrophilic domain of XcpT (XcpTp). XcpTp is lacking the C-terminal disulfide bridged "D" domain found in type IV pilins and likely involved in receptor binding. This is in agreement with the idea that the XcpT-containing pseudopilus is required for protein secretion and not for bacterial attachment. Interestingly, by solving the 3D structure of XcpTp we revealed that the previously called alphabeta-loop pilin region is in fact highly conserved among major type II pseudopilins and constitutes a specific consensus motif for identifying major pseudopilins, which belong to this family.


    Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques (AFMB), CNRS, Université de Provence et Université de la Méditerranée, UMR6098, Case 932, 163 Avenue de Luminy, 13288 Marseille cedex 9, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
General secretion pathway protein G A110Pseudomonas aeruginosaMutation(s): 0 
Gene Names: PA3101pddAxcpT
Find proteins for Q00514 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q00514 
Go to UniProtKB:  Q00514
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with acceptable covalent geometry 
  • OLDERADO: 2KEP Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-10-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance