Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.209 

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Crystal structures of two functionally different thioredoxins in spinach chloroplasts.

Capitani, G.Markovic-Housley, Z.DelVal, G.Morris, M.Jansonius, J.N.Schurmann, P.

(2000) J Mol Biol 302: 135-154

  • DOI: https://doi.org/10.1006/jmbi.2000.4006
  • Primary Citation of Related Structures:  
    1F9M, 1FAA, 1FB0, 1FB6

  • PubMed Abstract: 

    Thioredoxins are small ubiquitous proteins which act as general protein disulfide reductases in living cells. Chloroplasts contain two distinct thioredoxins ( f and m) with different phylogenetic origin. Both act as enzyme regulatory proteins but have different specificities towards target enzymes. Thioredoxin f (Trx f), which shares only low sequence identity with thioredoxin m (Trx m) and with all other known thioredoxins, activates enzymes of the Calvin cycle and other photosynthetic processes. Trx m shows high sequence similarity with bacterial thioredoxins and activates other chloroplast enzymes. The here described structural studies of the two chloroplast thioredoxins were carried out in order to gain insight into the structure/function relationships of these proteins. Crystal structures were determined for oxidized, recombinant thioredoxin f (Trx f-L) and at the N terminus truncated form of it (Trx f-S), as well as for oxidized and reduced thioredoxin m (at 2.1 and 2.3 A resolution, respectively). Whereas thioredoxin f crystallized as a monomer, both truncated thioredoxin f and thioredoxin m crystallized as non-covalent dimers. The structures of thioredoxins f and m exhibit the typical thioredoxin fold consisting of a central twisted five-stranded beta-sheet surrounded by four alpha-helices. Thioredoxin f contains an additional alpha-helix at the N terminus and an exposed third cysteine close to the active site. The overall three-dimensional structures of the two chloroplast thioredoxins are quite similar. However, the two proteins have a significantly different surface topology and charge distribution around the active site. An interesting feature which might significantly contribute to the specificity of thioredoxin f is an inherent flexibility of its active site, which has expressed itself crystallographically in two different crystal forms.

  • Organizational Affiliation

    Structural Biology Division Biozentrum, University of Basel, Basel, CH-4056, Switzerland. capitani@biocfebs.unizh.ch

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
THIOREDOXIN F124Spinacia oleraceaMutation(s): 2 
Find proteins for P09856 (Spinacia oleracea)
Explore P09856 
Go to UniProtKB:  P09856
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09856
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.209 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 30.6α = 90
b = 63.1β = 110.7
c = 31.6γ = 90
Software Package:
Software NamePurpose
MADNESSdata collection
ROTAVATAdata reduction
MADNESSdata reduction
CCP4data scaling
ROTAVATAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-09-20
    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: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2018-04-18
    Changes: Data collection
  • Version 1.5: 2021-11-03
    Changes: Database references