5IZ1

Physcomitrella patens FBPase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.315 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.257 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Chloroplast FBPase and SBPase are thioredoxin-linked enzymes with similar architecture but different evolutionary histories.

Gutle, D.D.Roret, T.Muller, S.J.Couturier, J.Lemaire, S.D.Hecker, A.Dhalleine, T.Buchanan, B.B.Reski, R.Einsle, O.Jacquot, J.P.

(2016) Proc Natl Acad Sci U S A 113: 6779-6784

  • DOI: 10.1073/pnas.1606241113
  • Primary Citation of Related Structures:  
    5IZ1, 5IZ3

  • PubMed Abstract: 
  • The Calvin-Benson cycle of carbon dioxide fixation in chloroplasts is controlled by light-dependent redox reactions that target specific enzymes. Of the regulatory members of the cycle, our knowledge of sedoheptulose-1,7-bisphosphatase (SBPase) is particularly scanty, despite growing evidence for its importance and link to plant productivity ...

    The Calvin-Benson cycle of carbon dioxide fixation in chloroplasts is controlled by light-dependent redox reactions that target specific enzymes. Of the regulatory members of the cycle, our knowledge of sedoheptulose-1,7-bisphosphatase (SBPase) is particularly scanty, despite growing evidence for its importance and link to plant productivity. To help fill this gap, we have purified, crystallized, and characterized the recombinant form of the enzyme together with the better studied fructose-1,6-bisphosphatase (FBPase), in both cases from the moss Physcomitrella patens (Pp). Overall, the moss enzymes resembled their counterparts from seed plants, including oligomeric organization-PpSBPase is a dimer, and PpFBPase is a tetramer. The two phosphatases showed striking structural homology to each other, differing primarily in their solvent-exposed surface areas in a manner accounting for their specificity for seven-carbon (sedoheptulose) and six-carbon (fructose) sugar bisphosphate substrates. The two enzymes had a similar redox potential for their regulatory redox-active disulfides (-310 mV for PpSBPase vs. -290 mV for PpFBPase), requirement for Mg(2+) and thioredoxin (TRX) specificity (TRX f > TRX m). Previously known to differ in the position and sequence of their regulatory cysteines, the enzymes unexpectedly showed unique evolutionary histories. The FBPase gene originated in bacteria in conjunction with the endosymbiotic event giving rise to mitochondria, whereas SBPase arose from an archaeal gene resident in the eukaryotic host. These findings raise the question of how enzymes with such different evolutionary origins achieved structural similarity and adapted to control by the same light-dependent photosynthetic mechanism-namely ferredoxin, ferredoxin-thioredoxin reductase, and thioredoxin.


    Organizational Affiliation

    Université de Lorraine, UMR 1136 Interactions Arbres Microorganismes, F-54500 Vandœuvre-les-Nancy, France; Institut national de la recherche agronomique (INRA), UMR 1136 Interactions Arbres Microorganismes, F-54280 Champenoux, France; j2p@univ-lorraine.fr view@berkeley.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
fructose-1,6-bisphosphataseA, B, C, D337Physcomitrium patensMutation(s): 0 
Gene Names: PHYPADRAFT_233069PHYPA_010442
EC: 3.1.3.11
UniProt
Find proteins for A9T230 (Physcomitrium patens)
Explore A9T230 
Go to UniProtKB:  A9T230
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.315 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.257 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.075α = 90
b = 84.803β = 104.59
c = 105.748γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

  • Deposited Date: 2016-03-24 
  • Released Date: 2016-06-08 
  • Deposition Author(s): Einsle, O., Guetle, D.

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-08
    Type: Initial release
  • Version 1.1: 2016-06-22
    Changes: Database references
  • Version 1.2: 2019-10-16
    Changes: Data collection