Annotations: 1SUR

Domain Annotation: SCOP/SCOPe Classification SCOP Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1sura_	Alpha and beta proteins (a/b)	Adenine nucleotide alpha hydrolase-like	Adenine nucleotide alpha hydrolases-like	PAPS reductase-like	Phosphoadenylyl sulphate (PAPS) reductase	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	PAPS reductase-like	8031831	4003838	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Adenine nucleotide alpha hydrolases-like	8044209	3001593	SCOP2 (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	PAPS_reduct	e1surA1	A: a/b three-layered sandwiches	X: HUP domain-like	H: HUP domains (From Topology)	T: HUP domains	F: PAPS_reduct	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.620	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	HUPs	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01507	Phosphoadenosine phosphosulfate reductase family (PAPS_reduct)	Phosphoadenosine phosphosulfate reductase family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	PAPS REDUCTASE	oxidoreductase activity, acting on a sulfur group of donors oxidoreductase activity oxidoreductase activity, acting on a sulfur group of donors, disulfide as acceptor phosphoadenylyl-sulfate reductase (thioredoxin) activity catalytic activity	sulfur compound biosynthetic process biosynthetic process cellular biosynthetic process cellular metabolic process sulfur compound metabolic process metabolic process cellular process hydrogen sulfide biosynthetic process hydrogen sulfide metabolic process sulfate assimilation sulfate assimilation, phosphoadenylyl sulfate reduction by phosphoadenylyl-sulfate reductase (thioredoxin)	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR004511	Phosphoadenosine phosphosulphate/adenosine 5'-phosphosulphate reductase	Family
A	IPR002500	Phosphoadenosine phosphosulphate reductase	Domain
A	IPR014729	Rossmann-like alpha/beta/alpha sandwich fold	Homologous Superfamily
A	IPR011800	Phosphoadenosine phosphosulphate reductase CysH	Family

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

Chains	Enzyme Name	Description	Catalytic Residues
A	phosphoadenylyl-sulfate reductase (thioredoxin) M-CSA #279	Requiring thioredoxin as an electron donor, phosphoadenosine phosphosulphate reductase (CysH) catalyses the reduction of phosphoadenosine phosphosulphate (PAPS) to sulphite and phosphoadenosine phosphate (PAP). It is part of the pathway that synthesises sulfite from sulfate. This pathway for introducing sulfur into biological molecules which utilises phosphoadenylyl reductase is only present in prototrophic organsisms.	Defined by 2 residues: TRP:A-204TYR:A-208 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 1.8.99.4 (PDB Primary Data) Search M-CSA Motif + EC 1.8.99.4

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.