1DJ7

CRYSTAL STRUCTURE OF FERREDOXIN THIOREDOXIN REDUCTASE

• PDB DOI: https://doi.org/10.2210/pdb1DJ7/pdb

• Classification: ELECTRON TRANSPORT
• Organism(s): Synechocystis sp. PCC 6803
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1999-12-02 Released: 2000-02-14 
• Deposition Author(s): Dai, S., Schwendtmayer, C., Schurmann, P., Ramaswamy, S., Eklund, H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.278 
• R-Value Work: 0.238 
• R-Value Observed: 0.264 

Literature

Redox signaling in chloroplasts: cleavage of disulfides by an iron-sulfur cluster.

Dai, S., Schwendtmayer, C., Schurmann, P., Ramaswamy, S., Eklund, H.

(2000) Science 287: 655-658

• PubMed: 10649999 
• DOI: https://doi.org/10.1126/science.287.5453.655
• Primary Citation of Related Structures:  
  1DJ7


• PubMed Abstract: 
  

  Light generates reducing equivalents in chloroplasts that are used not only for carbon reduction, but also for the regulation of the activity of chloroplast enzymes by reduction of regulatory disulfides via the ferredoxin:thioredoxin reductase (FTR) system. FTR, the key electron/thiol transducer enzyme in this pathway, is unique in that it can reduce disulfides by an iron-sulfur cluster, a property that is explained by the tight contact of its active-site disulfide and the iron-sulfur center. The thin, flat FTR molecule makes the two-electron reduction possible by forming on one side a mixed disulfide with thioredoxin and by providing on the opposite side access to ferredoxin for delivering electrons.

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Organizational Affiliation: 

Department of Molecular Biology, Swedish University of Agricultural Sciences, Box 590, Biomedical Center, S-751 24 Uppsala, Sweden.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 22.29 kDa 
• Atom Count: 1,556 
• Modelled Residue Count: 182 
• Deposited Residue Count: 192 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FERREDOXIN THIOREDOXIN REDUCTASE: CATALYTIC CHAIN	A	117	Synechocystis sp. PCC 6803	Mutation(s): 0
UniProt
Find proteins for Q55389 (Synechocystis sp. (strain PCC 6803 / Kazusa)) Explore Q55389  Go to UniProtKB:  Q55389

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
FERREDOXIN THIOREDOXIN REDUCTASE: VARIABLE CHAIN	B	75	Synechocystis sp. PCC 6803	Mutation(s): 0
UniProt
Find proteins for Q55781 (Synechocystis sp. (strain PCC 6803 / Kazusa)) Explore Q55781  Go to UniProtKB:  Q55781

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SF4	C [auth A]	IRON/SULFUR CLUSTER Fe4 S4 LJBDFODJNLIPKO-UHFFFAOYSA-N
SO4	D [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.278 
• R-Value Work: 0.238 
• R-Value Observed: 0.264 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.296	α = 90
b = 45.296	β = 90
c = 172.147	γ = 90

Software Package:

Software Name	Purpose
XDS	data scaling
XDS	data reduction
SHARP	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-02-14 
Deposition Author(s): Dai, S., Schwendtmayer, C., Schurmann, P., Ramaswamy, S., Eklund, H.

Revision History  

• Version 1.0: 2000-02-14
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Source and taxonomy, Version format compliance
• Version 1.3: 2017-10-04
  Changes: Refinement description
• Version 1.4: 2017-10-11
  Changes: Data collection