4DGK

Crystal structure of Phytoene desaturase CRTI from Pantoea ananatis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

On the structure and function of the phytoene desaturase CRTI from Pantoea ananatis, a membrane-peripheral and FAD-dependent oxidase/isomerase.

Schaub, P.Yu, Q.Gemmecker, S.Poussin-Courmontagne, P.Mailliot, J.McEwen, A.G.Ghisla, S.Al-Babili, S.Cavarelli, J.Beyer, P.

(2012) PLoS One 7: e39550-e39550

  • DOI: 10.1371/journal.pone.0039550
  • Primary Citation of Related Structures:  
    4DGK

  • PubMed Abstract: 
  • CRTI-type phytoene desaturases prevailing in bacteria and fungi can form lycopene directly from phytoene while plants employ two distinct desaturases and two cis-tans isomerases for the same purpose. This property renders CRTI a valuable gene to engineer provitamin A-formation to help combat vitamin A malnutrition, such as with Golden Rice ...

    CRTI-type phytoene desaturases prevailing in bacteria and fungi can form lycopene directly from phytoene while plants employ two distinct desaturases and two cis-tans isomerases for the same purpose. This property renders CRTI a valuable gene to engineer provitamin A-formation to help combat vitamin A malnutrition, such as with Golden Rice. To understand the biochemical processes involved, recombinant CRTI was produced and obtained in homogeneous form that shows high enzymatic activity with the lipophilic substrate phytoene contained in phosphatidyl-choline (PC) liposome membranes. The first crystal structure of apo-CRTI reveals that CRTI belongs to the flavoprotein superfamily comprising protoporphyrinogen IX oxidoreductase and monoamine oxidase. CRTI is a membrane-peripheral oxidoreductase which utilizes FAD as the sole redox-active cofactor. Oxygen, replaceable by quinones in its absence, is needed as the terminal electron acceptor. FAD, besides its catalytic role also displays a structural function by enabling the formation of enzymatically active CRTI membrane associates. Under anaerobic conditions the enzyme can act as a carotene cis-trans isomerase. In silico-docking experiments yielded information on substrate binding sites, potential catalytic residues and is in favor of single half-site recognition of the symmetrical C(40) hydrocarbon substrate.


    Organizational Affiliation

    Faculty of Biology, Centre for Biological Signaling Studies, University of Freiburg, Freiburg, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phytoene dehydrogenaseA501Pantoea ananatisMutation(s): 0 
Gene Names: crtI
EC: 1.14.99 (PDB Primary Data), 1.3.99.31 (UniProt)
UniProt
Find proteins for P21685 (Pantoea ananas)
Explore P21685 
Go to UniProtKB:  P21685
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.69α = 90
b = 90.69β = 90
c = 130.03γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SHARPphasing
BUSTERrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-10
    Type: Initial release
  • Version 1.1: 2018-01-24
    Changes: Structure summary