2AOT

Histamine Methyltransferase Complexed with the Antihistamine Drug Diphenhydramine

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
Pharos: Disease Associations
Protein Modification Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d2aota_	Alpha and beta proteins (a/b)	S-adenosyl-L-methionine-dependent methyltransferases	S-adenosyl-L-methionine-dependent methyltransferases	Histamine methyltransferase	Histamine methyltransferase	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d2aotb_	Alpha and beta proteins (a/b)	S-adenosyl-L-methionine-dependent methyltransferases	S-adenosyl-L-methionine-dependent methyltransferases	Histamine methyltransferase	Histamine methyltransferase	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	S-adenosyl-L-methionine-dependent methyltransferases	8039969	3000118	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	S-adenosyl-L-methionine-dependent methyltransferases	8039969	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	Methyltransf_11_3	e2aotA1	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: S-adenosyl-L-methionine-dependent methyltransferases	F: Methyltransf_11_3	ECOD (1.6)
B	Methyltransf_11_3	e2aotB1	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: S-adenosyl-L-methionine-dependent methyltransferases	F: Methyltransf_11_3	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.150	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Vaccinia Virus protein VP39	CATH (4.3.0)
B	3.40.50.150	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Vaccinia Virus protein VP39	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF13489	Methyltransferase domain (Methyltransf_23)	Methyltransferase domain	This family appears to be a methyltransferase domain.	Domain
B	PF13489	Methyltransferase domain (Methyltransf_23)	Methyltransferase domain	This family appears to be a methyltransferase domain.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Histamine N-methyltransferase	histamine N-methyltransferase activity transferase activity, transferring one-carbon groups N-methyltransferase activity transferase activity methyltransferase activity catalytic activity S-adenosylmethionine-dependent methyltransferase activity	ammonium ion metabolic process amine metabolic process metabolic process cellular process imidazole-containing compound metabolic process biogenic amine metabolic process histamine metabolic process methylation multicellular organismal process respiratory gaseous exchange by respiratory system catabolic process oxoacid metabolic process aromatic amino acid family catabolic process amino acid metabolic process ammonium ion metabolic process amine metabolic process metabolic process cellular process imidazole-containing compound metabolic process biogenic amine metabolic process histamine metabolic process methylation multicellular organismal process respiratory gaseous exchange by respiratory system catabolic process oxoacid metabolic process aromatic amino acid family catabolic process amino acid metabolic process organic acid catabolic process organic acid metabolic process alpha-amino acid metabolic process cellular catabolic process carboxylic acid catabolic process small molecule metabolic process amino acid catabolic process aromatic amino acid metabolic process L-histidine metabolic process imidazole-containing compound catabolic process L-amino acid catabolic process carboxylic acid metabolic process primary metabolic process L-amino acid metabolic process L-histidine catabolic process proteinogenic amino acid metabolic process alpha-amino acid catabolic process proteinogenic amino acid catabolic process small molecule catabolic process histamine catabolic process biogenic amine catabolic process amine catabolic process	extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle intracellular organelle centrosome microtubule organizing center intracellular anatomical structure extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle intracellular organelle centrosome microtubule organizing center intracellular anatomical structure cytoskeleton membraneless organelle intracellular membraneless organelle microtubule cytoskeleton cytoplasm cytosol nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen
B	Histamine N-methyltransferase	histamine N-methyltransferase activity transferase activity, transferring one-carbon groups N-methyltransferase activity transferase activity methyltransferase activity catalytic activity S-adenosylmethionine-dependent methyltransferase activity	ammonium ion metabolic process amine metabolic process metabolic process cellular process imidazole-containing compound metabolic process biogenic amine metabolic process histamine metabolic process methylation multicellular organismal process respiratory gaseous exchange by respiratory system catabolic process oxoacid metabolic process aromatic amino acid family catabolic process amino acid metabolic process ammonium ion metabolic process amine metabolic process metabolic process cellular process imidazole-containing compound metabolic process biogenic amine metabolic process histamine metabolic process methylation multicellular organismal process respiratory gaseous exchange by respiratory system catabolic process oxoacid metabolic process aromatic amino acid family catabolic process amino acid metabolic process organic acid catabolic process organic acid metabolic process alpha-amino acid metabolic process cellular catabolic process carboxylic acid catabolic process small molecule metabolic process amino acid catabolic process aromatic amino acid metabolic process L-histidine metabolic process imidazole-containing compound catabolic process L-amino acid catabolic process carboxylic acid metabolic process primary metabolic process L-amino acid metabolic process L-histidine catabolic process proteinogenic amino acid metabolic process alpha-amino acid catabolic process proteinogenic amino acid catabolic process small molecule catabolic process histamine catabolic process biogenic amine catabolic process amine catabolic process	extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle intracellular organelle centrosome microtubule organizing center intracellular anatomical structure extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle intracellular organelle centrosome microtubule organizing center intracellular anatomical structure cytoskeleton membraneless organelle intracellular membraneless organelle microtubule cytoskeleton cytoplasm cytosol nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR029063	S-adenosyl-L-methionine-dependent methyltransferase superfamily	Homologous Superfamily
A	IPR016673	Histamine N-methyltransferase-like	Family
B	IPR029063	S-adenosyl-L-methionine-dependent methyltransferase superfamily	Homologous Superfamily
B	IPR016673	Histamine N-methyltransferase-like	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P50135	rhinitis intellectual disability, autosomal recessive 51 urticaria drug allergy asthma lung cancer malignant glioma non-small cell lung carcinoma pilocytic astrocytoma adrenal cortex carcinoma ulcerative colitis astrocytic tumor cystic fibrosis ductal breast carcinoma in situ glioblastoma rhinitis intellectual disability, autosomal recessive 51 urticaria drug allergy asthma lung cancer malignant glioma non-small cell lung carcinoma pilocytic astrocytoma adrenal cortex carcinoma ulcerative colitis astrocytic tumor cystic fibrosis ductal breast carcinoma in situ glioblastoma juvenile dermatomyositis lung carcinoma malignant mesothelioma oligodendroglioma polycystic ovary syndrome subependymal giant cell astrocytoma Alcoholic Intoxication, Chronic atypical teratoid rhabdoid tumor Emery-Dreifuss muscular dystrophy inherited susceptibility to asthma interstitial cystitis large cell medulloblastoma malignant ependymoma medulloblastoma ovarian cancer primitive neuroectodermal tumor tuberculosis breast cancer Duchenne muscular dystrophy Gaucher disease intellectual disability invasive ductal breast carcinoma
B	Pharos: P50135	rhinitis intellectual disability, autosomal recessive 51 urticaria drug allergy asthma lung cancer malignant glioma non-small cell lung carcinoma pilocytic astrocytoma adrenal cortex carcinoma ulcerative colitis astrocytic tumor cystic fibrosis ductal breast carcinoma in situ glioblastoma rhinitis intellectual disability, autosomal recessive 51 urticaria drug allergy asthma lung cancer malignant glioma non-small cell lung carcinoma pilocytic astrocytoma adrenal cortex carcinoma ulcerative colitis astrocytic tumor cystic fibrosis ductal breast carcinoma in situ glioblastoma juvenile dermatomyositis lung carcinoma malignant mesothelioma oligodendroglioma polycystic ovary syndrome subependymal giant cell astrocytoma Alcoholic Intoxication, Chronic atypical teratoid rhabdoid tumor Emery-Dreifuss muscular dystrophy inherited susceptibility to asthma interstitial cystitis large cell medulloblastoma malignant ependymoma medulloblastoma ovarian cancer primitive neuroectodermal tumor tuberculosis breast cancer Duchenne muscular dystrophy Gaucher disease intellectual disability invasive ductal breast carcinoma

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A	CSO	Parent Component: CYS RESID: AA0205 PSI-MOD : L-cysteine sulfenic acid MOD:00210
B	CSO	Parent Component: CYS RESID: AA0205 , AA0205 PSI-MOD : L-cysteine sulfenic acid MOD:00210 , L-cysteine sulfenic acid MOD:00210

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.