1B6B

MELATONIN BIOSYNTHESIS: THE STRUCTURE OF SEROTONIN N-ACETYLTRANSFERASE AT 2.5 A RESOLUTION SUGGESTS A CATALYTIC MECHANISM

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	d1b6ba_	Alpha and beta proteins (a+b)	Acyl-CoA N-acyltransferases (Nat)	Acyl-CoA N-acyltransferases (Nat)	N-acetyl transferase, NAT	Serotonin N-acetyltranferase	sheep (Ovis aries ) [TaxId: 9940 ],	SCOPe (2.08)
B	d1b6bb_	Alpha and beta proteins (a+b)	Acyl-CoA N-acyltransferases (Nat)	Acyl-CoA N-acyltransferases (Nat)	N-acetyl transferase, NAT	Serotonin N-acetyltranferase	sheep (Ovis aries ) [TaxId: 9940 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Acyl-CoA N-acyltransferases (Nat)	8036037	3000403	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Acyl-CoA N-acyltransferases (Nat)	8036037	3000403	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	Acetyltransf_10_5	e1b6bA1	A: a+b three layers	X: Nat/Ivy	H: Acyl-CoA N-acyltransferases (Nat) (From Topology)	T: Acyl-CoA N-acyltransferases (Nat)	F: Acetyltransf_10_5	ECOD (1.6)
B	Acetyltransf_10_5	e1b6bB1	A: a+b three layers	X: Nat/Ivy	H: Acyl-CoA N-acyltransferases (Nat) (From Topology)	T: Acyl-CoA N-acyltransferases (Nat)	F: Acetyltransf_10_5	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.630.30	Alpha Beta	3-Layer(aba) Sandwich	Aminopeptidase	Gcn5-related N-acetyltransferase (GNAT)	CATH (4.3.0)
B	3.40.630.30	Alpha Beta	3-Layer(aba) Sandwich	Aminopeptidase	Gcn5-related N-acetyltransferase (GNAT)	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00583	Acetyltransferase (GNAT) family (Acetyltransf_1)	Acetyltransferase (GNAT) family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	PROTEIN (ARYLALKYLAMINE N-ACETYLTRANSFERASE)	aralkylamine N-acetyltransferase activity acetyltransferase activity N-acetyltransferase activity acyltransferase activity acyltransferase activity, transferring groups other than amino-acyl groups transferase activity catalytic activity N-acyltransferase activity	primary metabolic process gene expression macromolecule biosynthetic process protein acylation protein maturation protein acetylation biosynthetic process N-terminal protein amino acid modification macromolecule modification N-terminal protein amino acid acetylation metabolic process cellular process protein metabolic process macromolecule metabolic process primary metabolic process gene expression macromolecule biosynthetic process protein acylation protein maturation protein acetylation biosynthetic process N-terminal protein amino acid modification macromolecule modification N-terminal protein amino acid acetylation metabolic process cellular process protein metabolic process macromolecule metabolic process protein modification process response to light stimulus response to stimulus response to radiation response to abiotic stimulus rhythmic process circadian rhythm cellular response to nitrogen compound cellular response to stimulus response to organophosphorus response to oxygen-containing compound response to nitrogen compound response to purine-containing compound response to cAMP cellular response to oxygen-containing compound cellular response to chemical stimulus response to chemical cellular response to cAMP regulation of hormone levels biological regulation indole-containing compound metabolic process amide biosynthetic process hormone metabolic process melatonin metabolic process indole-containing compound biosynthetic process amide metabolic process regulation of biological quality melatonin biosynthetic process hormone biosynthetic process	cellular anatomical structure intracellular anatomical structure perinuclear region of cytoplasm cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR051635	Serotonin N-acetyltransferase-like	Family
A, B	IPR016181	Acyl-CoA N-acyltransferase	Homologous Superfamily
A, B	IPR000182	GNAT domain	Domain

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

Chains	Enzyme Name	Description	Catalytic Residues
A	aralkylamine N-acetyltransferase M-CSA #22	Aralkylamine N-acetyltransferase (AANAT) catalyses the conversion of serotonin to N-acetylserotonin, the precursor to the circadian neurohormone melatonin, important in coordinating daily and seasonal rhythms with light levels in the surrounding environment. Levels of AANAT (and levels of melatonin) are controlled by the proteolysis of AANAT.	Defined by 5 residues: SER:A-70 [auth A-97]LEU:A-84 [auth A-111]HIS:A-95 [auth A-122]LEU:A-97 [auth A-124]TYR:A-141 [auth A-168] \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 2.3.1.87 (PDB Primary Data) Search M-CSA Motif + EC 2.3.1.87

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 R01GM157729.