2AOT

Histamine Methyltransferase Complexed with the Antihistamine Drug Diphenhydramine

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	Histamine N-methyltransferase	polymer	292	33365.0	1	UniProt (P50135) Pfam (PF13489)	Homo sapiens (human)	HMT
2	B (B)	Histamine N-methyltransferase	polymer	292	33365.0	1	UniProt (P50135) Pfam (PF13489)	Homo sapiens (human)
3	C, E (A, B)	N-[2-(BENZHYDRYLOXY)ETHYL]-N,N-DIMETHYLAMINE	non-polymer		255.4	2	Chemie (2PM) PubChem (3100)
4	D, F (A, B)	S-ADENOSYL-L-HOMOCYSTEINE	non-polymer		384.4	2	Chemie (SAH) PubChem (193) PubChem (13792) PubChem (189149) PubChem (439155) PubChem (5284331) PubChem (71170554) PubChem (13231890) PubChem (16760024) PubChem (25210495) PubChem (44361184) PubChem (177678424) PubChem (46936206) PubChem (21125603) PubChem (25203782) PubChem (52224400) PubChem (50989525) PubChem (51380914) PubChem (52224398) PubChem (6419189) PubChem (57544532) PubChem (59046843) PubChem (59170628) PubChem (164157219) PubChem (59576228) PubChem (66805708) PubChem (70689219) PubChem (70702054) PubChem (70832431) PubChem (118374891) PubChem (118560068) PubChem (126969526) PubChem (129105892) PubChem (143518505) PubChem (154578335) PubChem (163054214) PubChem (163335525)
5	G, H (A, B)	water	water		18.0	337	Chemie (HOH)

Sequence modifications

A: 1 - 292 (UniProt: P50135)

PDB	External Database	Details
Cys 82	Cys 82	modified residue
Cso 217	Cys 217	modified residue
Cso 248	Cys 248	modified residue

B: 1 - 292 (UniProt: P50135)

PDB	External Database	Details
Cso 82	Cys 82	modified residue
Cys 217	Cys 217	modified residue
Cso 248	Cys 248	modified residue

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	66730.0
Non-Polymers*	Number of molecules	4
	Total formula weight	1279.5
All*	Total formula weight	68009.6

*Water molecules are not included.