3PI6

Crystal structure of the CFTR inhibitory factor Cif with the H177Y mutation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.164 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Pseudomonas aeruginosa Cif defines a distinct class of alpha/beta epoxide hydrolases utilizing a His/Tyr ring-opening pair.

Bahl, C.D.Madden, D.R.

(2012) Protein Pept.Lett. 19: 186-193


  • PubMed Abstract: 
  • The Gram-negative bacterium Pseudomonas aeruginosa is an opportunistic pathogen that secretes a multitude of virulence factors during the course of infection. Among these is Cif, an epoxide hydrolase (EH) that reduces the functional localization of t ...

    The Gram-negative bacterium Pseudomonas aeruginosa is an opportunistic pathogen that secretes a multitude of virulence factors during the course of infection. Among these is Cif, an epoxide hydrolase (EH) that reduces the functional localization of the cystic fibrosis transmembrane conductance regulator in epithelial cells. In addition to being the first reported EH virulence factor, Cif possesses unique sequence deviations from canonical EH motifs. Foremost among these is the substitution of a histidine for the first epoxide ring-opening tyrosine in the active site. To test the functional equivalence of Tyr and His side chains at this position, we have generated the mutant Cif-H177Y. Structural analysis confirms that both the WT His and mutant Tyr side chains can be accommodated without large-scale conformational changes. However, the Tyr mutant is functionally inactive. Based on a detailed analysis of the structure of the Tyr mutant, it appears that Cif's main-chain conformation imposes a functional requirement for a His at this position. Comparison with canonical EH structures reveals additional conformational differences, which are coupled to divergent sequence characteristics. When used to probe the genomes of other opportunistic pathogens, these sequence-structure criteria uncover candidate sequences that appear to form a distinct subfamily of Cif-like epoxide hydrolases characterized by a conserved His/Tyr ring-opening pair.


    Organizational Affiliation

    Dept. of Biochemistry, Dartmouth Medical School, 7200 Vail Building Hanover, NH 03755, USA. drm0001@dartmouth.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
hydrolase
A, B, C, D
301Pseudomonas aeruginosa (strain UCBPP-PA14)Mutation(s): 1 
Find proteins for A0A0H2ZD27 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Go to UniProtKB:  A0A0H2ZD27
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.164 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 168.394α = 90.00
b = 84.056β = 100.39
c = 89.325γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
XSCALEdata scaling
PHENIXphasing
XDSdata reduction
PHENIXmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-09-21
    Type: Initial release
  • Version 1.1: 2011-10-05
    Type: Database references
  • Version 1.2: 2013-06-19
    Type: Database references
  • Version 1.3: 2017-11-08
    Type: Advisory, Refinement description