XB-ART-46302
Biophys J
2012 Nov 21;10310:2071-81. doi: 10.1016/j.bpj.2012.10.016.
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GABA binding to an insect GABA receptor: a molecular dynamics and mutagenesis study.
Ashby JA
,
McGonigle IV
,
Price KL
,
Cohen N
,
Comitani F
,
Dougherty DA
,
Molteni C
,
Lummis SC
.
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RDL receptors are GABA-activated inhibitory Cys-loop receptors found throughout the insect CNS. They are a key target for insecticides. Here, we characterize the GABA binding site in RDL receptors using computational and electrophysiological techniques. A homology model of the extracellular domain of RDL was generated and GABA docked into the binding site. Molecular dynamics simulations predicted critical GABA binding interactions with aromatic residues F206, Y254, and Y109 and hydrophilic residues E204, S176, R111, R166, S176, and T251. These residues were mutated, expressed in Xenopus oocytes, and their functions assessed using electrophysiology. The data support the binding mechanism provided by the simulations, which predict that GABA forms many interactions with binding site residues, the most significant of which are cation-π interactions with F206 and Y254, H-bonds with E204, S205, R111, S176, T251, and ionic interactions with R111 and E204. These findings clarify the roles of a range of residues in binding GABA in the RDL receptor, and also show that molecular dynamics simulations are a useful tool to identify specific interactions in Cys-loop receptors.
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NS34407 NINDS NIH HHS , R01 NS034407 NINDS NIH HHS , WT 81925 Wellcome Trust , R37 NS034407 NINDS NIH HHS
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