1DJ7

CRYSTAL STRUCTURE OF FERREDOXIN THIOREDOXIN REDUCTASE

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Structure Motif: Primary M-CSA Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1dj7a_	Small proteins	Ferredoxin thioredoxin reductase (FTR), catalytic beta chain	Ferredoxin thioredoxin reductase (FTR), catalytic beta chain	Ferredoxin thioredoxin reductase (FTR), catalytic beta chain	Ferredoxin thioredoxin reductase (FTR), catalytic beta chain	(Synechocystis sp. PCC 6803 ) [TaxId: 1148 ],	SCOPe (2.08)
B	d1dj7b_	All beta proteins	SH3-like barrel	Electron transport accessory proteins	Ferredoxin thioredoxin reductase (FTR), alpha (variable) chain	Ferredoxin thioredoxin reductase (FTR), alpha (variable) chain	(Synechocystis sp. PCC 6803 ) [TaxId: 1148 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Ferredoxin thioredoxin reductase (FTR) catalytic beta chain	8036077	3001072	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Electron transport accessory proteins	8036078	3000325	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF02943	e1dj7A1	A: few secondary structure elements	X: Ferredoxin thioredoxin reductase (FTR), catalytic beta chain (From Topology)	H: Ferredoxin thioredoxin reductase (FTR), catalytic beta chain (From Topology)	T: Ferredoxin thioredoxin reductase (FTR), catalytic beta chain	F: PF02943	ECOD (1.6)
B	PF02941	e1dj7B1	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF02941	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.90.460.10	Alpha Beta	Alpha-Beta Complex	Ferredoxin Thioredoxin Reductase	Ferredoxin thioredoxin reductase catalytic beta subunit	CATH (4.3.0)
B	2.30.30.50	Mainly Beta	Roll	SH3 type barrels.		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF02943	Ferredoxin thioredoxin reductase catalytic beta chain (FeThRed_B)	Ferredoxin thioredoxin reductase catalytic beta chain	-	Domain
B	PF02941	Ferredoxin thioredoxin reductase variable alpha chain (FeThRed_A)	Ferredoxin thioredoxin reductase variable alpha chain	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	FERREDOXIN THIOREDOXIN REDUCTASE: CATALYTIC CHAIN	oxidoreductase activity, acting on a sulfur group of donors oxidoreductase activity ferredoxin-thioredoxin reductase activity oxidoreductase activity, acting on a sulfur group of donors, iron-sulfur protein as acceptor catalytic activity oxidoreductase activity, acting on iron-sulfur proteins as donors iron-sulfur cluster binding binding 4 iron, 4 sulfur cluster binding metal cluster binding small molecule binding electron transfer activity cation binding ion binding oxidoreductase activity, acting on a sulfur group of donors oxidoreductase activity ferredoxin-thioredoxin reductase activity oxidoreductase activity, acting on a sulfur group of donors, iron-sulfur protein as acceptor catalytic activity oxidoreductase activity, acting on iron-sulfur proteins as donors iron-sulfur cluster binding binding 4 iron, 4 sulfur cluster binding metal cluster binding small molecule binding electron transfer activity cation binding ion binding metal ion binding	photosynthesis cellular metabolic process metabolic process cellular process	-
B	FERREDOXIN THIOREDOXIN REDUCTASE: VARIABLE CHAIN	oxidoreductase activity catalytic activity	photosynthesis cellular metabolic process metabolic process cellular process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR036644	Ferredoxin thioredoxin reductase catalytic beta subunit superfamily	Homologous Superfamily
A	IPR024707	Ferredoxin-thioredoxin reductase catalytic subunit, cyanobacteria-type	Family
A	IPR004209	Ferredoxin thioredoxin reductase catalytic beta subunit	Family
B	IPR008990	Electron transport accessory-like domain superfamily	Homologous Superfamily
B	IPR044166	Ferredoxin-thioredoxin reductase, variable chain	Family
B	IPR004207	Ferredoxin thioredoxin reductase, alpha chain	Domain

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	ferredoxin:thioredoxin reductase M-CSA #980	Ferredoxin:thioredoxin reductase (FTR) transfers the light-generated redox signal received by the chloroplast [Fe₂S₂]^2+,+ ferredoxin (Fdx) to thioredoxins (Trxs), as part of a redox regulatory system controlling the activity of a wide range of oxygenic photosynthesis enzymes in response to light. The active site consists of a [Fe₄S₄] cluster and an an adjacent redox-active disulphide. FTR converts two light-generated one-electron signals to one two-electron thiol signal which is then transmitted via dithiol/disulphide interchange reactions to specific enzymes which are critical to the regulation of the Calvin cycle. Phylogenetic analyses of genomic sequences revealed that the catalytic subunit of FTR originated in microaerophilic bacteria where it may have functioned in regulating CO₂ fixation. Also, FTR may have been acquired by later-evolving species via horizontal gene transfer. FTR-like enzymes, for example FDR, with structural and functional diversity have evolved to meet ecological needs.	Defined by 7 residues: CYS:A-55CYS:A-57CYS:A-74CYS:A-76CYS:A-85HIS:A-86CYS:A-87 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.