Experimental Data Snapshot

  • Resolution: 2.65 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.235 

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This is version 1.5 of the entry. See complete history


Redox signalling in the chloroplast: structure of oxidized pea fructose-1,6-bisphosphate phosphatase.

Chiadmi, M.Navaza, A.Miginiac-Maslow, M.Jacquot, J.P.Cherfils, J.

(1999) EMBO J 18: 6809-6815

  • DOI: https://doi.org/10.1093/emboj/18.23.6809
  • Primary Citation of Related Structures:  
    1D9Q, 1DBZ, 1DCU

  • PubMed Abstract: 

    Sunlight provides the energy source for the assimilation of carbon dioxide by photosynthesis, but it also provides regulatory signals that switch on specific sets of enzymes involved in the alternation of light and dark metabolisms in chloroplasts. Capture of photons by chlorophyll pigments triggers redox cascades that ultimately activate target enzymes via the reduction of regulatory disulfide bridges by thioredoxins. Here we report the structure of the oxidized, low-activity form of chloroplastic fructose-1, 6-bisphosphate phosphatase (FBPase), one of the four enzymes of the Calvin cycle whose activity is redox-regulated by light. The regulation is of allosteric nature, with a disulfide bridge promoting the disruption of the catalytic site across a distance of 20 A. Unexpectedly, regulation of plant FBPases by thiol-disulfide interchange differs in every respect from the regulation of mammalian gluconeogenic FBPases by AMP. We also report a second crystal form of oxidized FBPase whose tetrameric structure departs markedly from D(2) symmetry, a rare event in oligomeric structures, and the structure of a constitutively active mutant that is unable to form the regulatory disulfide bridge. Altogether, these structures provide a structural basis for redox regulation in the chloroplast.

  • Organizational Affiliation

    Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, Avenue de la Terrasse, 91198 Gif sur Yvette.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
357Pisum sativumMutation(s): 1 
Find proteins for P46275 (Pisum sativum)
Explore P46275 
Go to UniProtKB:  P46275
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46275
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.65 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.9α = 90
b = 114.5β = 114.5
c = 94.5γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-12-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references
  • Version 1.4: 2024-02-07
    Changes: Data collection
  • Version 1.5: 2024-04-03
    Changes: Refinement description