4OKO

Crystal structure of Francisella tularensis REP34 (Rapid Encystment Phenotype Protein 34 KDa)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Structure and Function of REP34 Implicates Carboxypeptidase Activity in Francisella tularensis Host Cell Invasion.

Feld, G.K.El-Etr, S.Corzett, M.H.Hunter, M.S.Belhocine, K.Monack, D.M.Frank, M.Segelke, B.W.Rasley, A.

(2014) J Biol Chem 289: 30668-30679

  • DOI: https://doi.org/10.1074/jbc.M114.599381
  • Primary Citation of Related Structures:  
    4OKO

  • PubMed Abstract: 

    Francisella tularensis is the etiological agent of tularemia, or rabbit fever. Although F. tularensis is a recognized biothreat agent with broad and expanding geographical range, its mechanism of infection and environmental persistence remain poorly understood. Previously, we identified seven F. tularensis proteins that induce a rapid encystment phenotype (REP) in the free-living amoeba, Acanthamoeba castellanii. Encystment is essential to the pathogen's long term intracellular survival in the amoeba. Here, we characterize the cellular and molecular function of REP34, a REP protein with a mass of 34 kDa. A REP34 knock-out strain of F. tularensis has a reduced ability to both induce encystment in A. castellanii and invade human macrophages. We determined the crystal structure of REP34 to 2.05-Å resolution and demonstrate robust carboxypeptidase B-like activity for the enzyme. REP34 is a zinc-containing monomeric protein with close structural homology to the metallocarboxypeptidase family of peptidases. REP34 possesses a novel topology and substrate binding pocket that deviates from the canonical funnelin structure of carboxypeptidases, putatively resulting in a catalytic role for a conserved tyrosine and distinct S1' recognition site. Taken together, these results identify REP34 as an active carboxypeptidase, implicate the enzyme as a potential key F. tularensis effector protein, and may help elucidate a mechanistic understanding of F. tularensis infection of phagocytic cells.


  • Organizational Affiliation

    Biosciences and Biotechnology and Lawrence Livermore National Laboratory, Livermore, California 94550.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Rapid Encystment Phenotype Protein 34 KDa
A, B, C, D
312Francisella tularensis subsp. novicida U112Mutation(s): 0 
Gene Names: FTN_0149
EC: 3.4
UniProt
Find proteins for A0Q494 (Francisella tularensis subsp. novicida (strain U112))
Explore A0Q494 
Go to UniProtKB:  A0Q494
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0Q494
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.712α = 70.36
b = 63.308β = 84.34
c = 81.689γ = 82.53
Software Package:
Software NamePurpose
HKL-2000data collection
SOLVEphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-09-24
    Type: Initial release
  • Version 1.1: 2014-10-01
    Changes: Database references
  • Version 1.2: 2014-11-19
    Changes: Database references
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-04-03
    Changes: Refinement description