Annotations: 9Q41

Crystal Structure of Human Apo Spermidine Synthase

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	S-adenosyl-L-methionine-dependent methyltransferases	8043378	3000118	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	S-adenosyl-L-methionine-dependent methyltransferases	8043378	3000118	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	Diphtheria_C	e9q41A1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Diphtheria_C	ECOD (v295.2)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF17284	Spermidine synthase tetramerisation domain (Spermine_synt_N)	Spermidine synthase tetramerisation domain	This domain represents the N-terminal tetramerization domain from spermidine synthase.	Domain
A, B	PF01564	Spermine/spermidine synthase domain (Spermine_synth)	Spermine/spermidine synthase domain	Spermine and spermidine are polyamines. This family includes spermidine synthase that catalyses the fifth (last) step in the biosynthesis of spermidine from arginine, and spermine synthase.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Spermidine synthase	identical protein binding protein binding binding protein homodimerization activity protein dimerization activity spermidine synthase activity transferase activity transferase activity, transferring alkyl or aryl (other than methyl) groups catalytic activity	polyamine metabolic process amine metabolic process biogenic amine biosynthetic process spermidine metabolic process biosynthetic process amine biosynthetic process polyamine biosynthetic process metabolic process cellular process spermidine biosynthetic process biogenic amine metabolic process spermine metabolic process spermine biosynthetic process	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR001045	Spermidine/spermine synthases	Family
A, B	IPR029063	S-adenosyl-L-methionine-dependent methyltransferase superfamily	Homologous Superfamily
A, B	IPR037163	Spermidine synthase, tetramerisation domain superfamily	Homologous Superfamily
A, B	IPR035246	Spermidine synthase, tetramerisation domain	Domain
A, B	IPR030668	Spermidine/spermine synthase, eukaryotes	Family
A, B	IPR030374	Polyamine biosynthesis domain	Domain
A, B	IPR030373	Polyamine biosynthesis domain, conserved site	Conserved Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	: P19623	Adenocarcinoma of Lung Ewing sarcoma lung adenocarcinoma pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia ulcerative colitis androgenetic alopecia interstitial cystitis lung cancer pancreatic intraductal papillary-mucinous carcinoma psoriasis large cell medulloblastoma ovarian cancer pancreatic intraductal papillary-mucinous neoplasm Sjogren syndrome