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2015 ; 16
(13
): 2760-2767
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Insight into the Binding Mode of Agonists of the Nicotinic Acetylcholine Receptor
from Calculated Electron Densities
#MMPMID26175091
Beck ME
; Gutbrod O
; Matthiesen S
Chemphyschem
2015[Sep]; 16
(13
): 2760-2767
PMID26175091
show ga
Insect nicotinic acetylcholine receptors (nAChRs) are among the most prominent
and most economically important insecticide targets. Thus, an understanding of
the modes of binding of respective agonists is important for the design of
specific compounds with favorable vertebrate profiles. In the case of nAChRs, the
lack of available high-resolution X-ray structures leaves theoretical
considerations as the only viable option. Starting from classical homology and
docking approaches, binding mode hypotheses are created for five agonists of the
nAChR, covering insecticides in the main group 4 of the Insecticide Resistance
Action Committee (IRAC) mode of action (MoA) classification, namely,
neonicotinoids, nicotine, sulfoxaflor, and butenolides. To better understand
these binding modes, the topologies of calculated electron densities of
small-model systems are analyzed in the framework of the quantum theory of atoms
in molecules. The theoretically obtained modes of binding are very much in line
with the biology-driven IRAC MoA classification of the investigated ligands.