2aot

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[[Image:2aot.gif|left|200px]]
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{{STRUCTURE_2aot| PDB=2aot | SCENE= }}
{{STRUCTURE_2aot| PDB=2aot | SCENE= }}
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'''Histamine Methyltransferase Complexed with the Antihistamine Drug Diphenhydramine'''
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===Histamine Methyltransferase Complexed with the Antihistamine Drug Diphenhydramine===
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==Overview==
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In mammals, histamine action is terminated through metabolic inactivation by histamine N-methyltransferase (HNMT) and diamine oxidase. In addition to three well-studied pharmacological functions, smooth muscle contraction, increased vascular permeability, and stimulation of gastric acid secretion, histamine plays important roles in neurotransmission, immunomodulation, and regulation of cell proliferation. The histamine receptor H1 antagonist diphenhydramine, the antimalarial drug amodiaquine, the antifolate drug metoprine, and the anticholinesterase drug tacrine (an early drug for Alzheimer's disease) are surprisingly all potent HNMT inhibitors, having inhibition constants in the range of 10-100nM. We have determined the structural mode of interaction of these four inhibitors with HNMT. Despite their structural diversity, they all occupy the histamine-binding site, thus blocking access to the enzyme's active site. Near the N terminus of HNMT, several aromatic residues (Phe9, Tyr15, and Phe19) adopt different rotamer conformations or become disordered in the enzyme-inhibitor complexes, accommodating the diverse, rigid hydrophobic groups of the inhibitors. The maximized shape complementarity between the protein aromatic side-chains and aromatic ring(s) of the inhibitors are responsible for the tight binding of these varied inhibitors.
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The line below this paragraph, {{ABSTRACT_PUBMED_16168438}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 16168438 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16168438}}
==Disease==
==Disease==
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[[Category: Classic methyltransferase fold]]
[[Category: Classic methyltransferase fold]]
[[Category: Protein-drug complex]]
[[Category: Protein-drug complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:17:56 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 19:43:51 2008''

Revision as of 16:43, 28 July 2008

Image:2aot.png

Template:STRUCTURE 2aot

Contents

Histamine Methyltransferase Complexed with the Antihistamine Drug Diphenhydramine

Template:ABSTRACT PUBMED 16168438

Disease

Known disease associated with this structure: Asthma, susceptibility to OMIM:[605238]

About this Structure

2AOT is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural basis for inhibition of histamine N-methyltransferase by diverse drugs., Horton JR, Sawada K, Nishibori M, Cheng X, J Mol Biol. 2005 Oct 21;353(2):334-44. PMID:16168438

Page seeded by OCA on Mon Jul 28 19:43:51 2008

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