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The Lipid/Protein Interface as Xenobiotic Target Site : Kinetic Analysis of the Nicotinic Acetylcholine Receptor.
J. Biol. Chem. 276, 42191-42195 (2001)
Membrane proteins are known to be solvated and functionally activated by a fixed number of lipid molecules whose multiple binding can be described by Adair-type binding equations. Lipophilic xenobiotics such as general anesthetics may act by competitive displacement of protein-bound lipids. A kinetic equation is now presented for various binding stoichiometries of lipid and xenobiotic, and microscopic binding constants of anesthetics and organic solvents are derived from two independent assay systems for the enhancement of agonist binding to the nicotinic acetylcholine receptor. These constants lead to the first available free energy estimate (−6.4 kcal/mol) for the binding of membrane lipid to an integral membrane protein.
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Publication type
Article: Journal article
Document type
Scientific Article
ISSN (print) / ISBN
0021-9258
e-ISSN
1083-351X
Quellenangaben
Volume: 276,
Pages: 42191-42195
Publisher
American Society for Biochemistry and Molecular Biology
Reviewing status
Peer reviewed