A cation-pi interaction in the binding site of the glycine receptor is mediated by a phenylalanine residue
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A cation-pi interaction in the binding site of the glycine receptor is mediated by a phenylalanine residue. / Pless, Stephan Alexander; Millen, Kat S; Hanek, Ariele P; Lynch, Joseph W; Lester, Henry A; Lummis, Sarah C R; Dougherty, Dennis A.
In: The Journal of neuroscience : the official journal of the Society for Neuroscience, Vol. 28, No. 43, 22.10.2008, p. 10937-42.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - A cation-pi interaction in the binding site of the glycine receptor is mediated by a phenylalanine residue
AU - Pless, Stephan Alexander
AU - Millen, Kat S
AU - Hanek, Ariele P
AU - Lynch, Joseph W
AU - Lester, Henry A
AU - Lummis, Sarah C R
AU - Dougherty, Dennis A
PY - 2008/10/22
Y1 - 2008/10/22
N2 - Cys-loop receptor binding sites characteristically contain many aromatic amino acids. In nicotinic ACh and 5-HT3 receptors, a Trp residue forms a cation-pi interaction with the agonist, whereas in GABA(A) receptors, a Tyr performs this role. The glycine receptor binding site, however, contains predominantly Phe residues. Homology models suggest that two of these Phe side chains, Phe159 and Phe207, and possibly a third, Phe63, are positioned such that they could contribute to a cation-pi interaction with the primary amine of glycine. Here, we test this hypothesis by incorporation of a series of fluorinated Phe derivatives using unnatural amino acid mutagenesis. The data reveal a clear correlation between the glycine EC(50) value and the cation-pi binding ability of the fluorinated Phe derivatives at position 159, but not at positions 207 or 63, indicating a single cation-pi interaction between glycine and Phe159. The data thus provide an anchor point for locating glycine in its binding site, and demonstrate for the first time a cation-pi interaction between Phe and a neurotransmitter.
AB - Cys-loop receptor binding sites characteristically contain many aromatic amino acids. In nicotinic ACh and 5-HT3 receptors, a Trp residue forms a cation-pi interaction with the agonist, whereas in GABA(A) receptors, a Tyr performs this role. The glycine receptor binding site, however, contains predominantly Phe residues. Homology models suggest that two of these Phe side chains, Phe159 and Phe207, and possibly a third, Phe63, are positioned such that they could contribute to a cation-pi interaction with the primary amine of glycine. Here, we test this hypothesis by incorporation of a series of fluorinated Phe derivatives using unnatural amino acid mutagenesis. The data reveal a clear correlation between the glycine EC(50) value and the cation-pi binding ability of the fluorinated Phe derivatives at position 159, but not at positions 207 or 63, indicating a single cation-pi interaction between glycine and Phe159. The data thus provide an anchor point for locating glycine in its binding site, and demonstrate for the first time a cation-pi interaction between Phe and a neurotransmitter.
KW - Amino Acids, Aromatic
KW - Animals
KW - Binding Sites
KW - Cations
KW - Glycine
KW - Humans
KW - Microinjections
KW - Models, Molecular
KW - Mutagenesis, Site-Directed
KW - Oocytes
KW - Phenylalanine
KW - Protein Binding
KW - Protein Conformation
KW - Protein Structure, Secondary
KW - Radioligand Assay
KW - Receptors, Glycine
KW - Structure-Activity Relationship
KW - Xenopus laevis
U2 - 10.1523/JNEUROSCI.2540-08.2008
DO - 10.1523/JNEUROSCI.2540-08.2008
M3 - Journal article
C2 - 18945901
VL - 28
SP - 10937
EP - 10942
JO - The Journal of neuroscience : the official journal of the Society for Neuroscience
JF - The Journal of neuroscience : the official journal of the Society for Neuroscience
SN - 0270-6474
IS - 43
ER -
ID: 122597853