X-ray diffraction
2.97Å resolution

Histamine Methyltransferase (Natural Variant I105) Complexed with the Acetylcholinesterase Inhibitor and Altzheimer's Disease Drug Tacrine

Source organism: Homo sapiens

Function and Biology Details

Reaction catalysed:
S-adenosyl-L-methionine + histamine = S-adenosyl-L-homocysteine + N(tau)-methylhistamine
Biological process:
Cellular component:

Structure analysis Details

Assembly composition:
monomeric (preferred)
Entry contents:
1 distinct polypeptide molecule
Histamine N-methyltransferase Chains: A, B
Molecule details ›
Chains: A, B
Length: 292 amino acids
Theoretical weight: 33.35 KDa
Source organism: Homo sapiens
Expression system: Escherichia coli
  • Canonical: P50135 (Residues: 1-292; Coverage: 100%)
Gene name: HNMT
Sequence domains: Methyltransferase domain
Structure domains: Vaccinia Virus protein VP39

Ligands and Environments

1 bound ligand:
No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: NSLS BEAMLINE X26C
Spacegroup: P6
Unit cell:
a: 132.96Å b: 132.96Å c: 65.21Å
α: 90° β: 90° γ: 120°
R R work R free
0.224 0.219 0.269
Expression system: Escherichia coli