Two polymorphic forms of human histamine methyltransferase: structural, thermal, and kinetic comparisons.
Horton, J.R., Sawada, K., Nishibori, M., Zhang, X., Cheng, X.(2001) Structure 9: 837-849
- PubMed: 11566133 
- DOI: https://doi.org/10.1016/s0969-2126(01)00643-8
- Primary Citation of Related Structures:  
1JQD, 1JQE - PubMed Abstract: 
Histamine plays important biological roles in cell-to-cell communication; it is a mediator in allergic responses, a regulator of gastric acid secretion, a messenger in bronchial asthma, and a neurotransmitter in the central nervous system. Histamine acts by binding to histamine receptors, and its local action is terminated primarily by methylation. Human histamine N-methyltransferase (HNMT) has a common polymorphism at residue 105 that correlates with the high- (Thr) and low- (Ile) activity phenotypes.
Organizational Affiliation: 
Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Road, Atlanta, GA 30322, USA.