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Lipid-based inhibitors act directly on GlyT2.
ACS Chemical Neuroscience 2018 December 6
The endogenous lipids N-arachidonylglycine and oleoyl-L-carnitine, are potential therapeutic leads in the treatment of chronic pain through their inhibition of the glycine transporter GlyT2. However, their mechanism of action is unknown. It has been hypothesised that these "bioactive" lipids either inhibit GlyT2 indirectly, by significantly perturbing the biophysical properties of the membrane; or directly, by binding directly to the transporter (either from a membrane-exposed or solvent-exposed binding site). Here, we used molecular dynamics simulations to study the effects of the lipids anandamide, N-arachidonylglycine and oleoyl-L-carnitine on a) the biophysical properties of the bilayer, and b) direct binding interactions with GlyT2. During the simulations, the biophysical properties of the bilayer itself-for example the area per lipid, bilayer thickness and order parameters-were not significantly altered by the presence or type of bioactive lipid, regardless of the presence of GlyT2. Our work, together with previous computational and experimental data, suggests that these acyl-inhibitors of GlyT2 inhibit the transporter by directly binding to it. However, these bioactive lipids bound to various parts of GlyT2 and did not prefer a single binding site during 4.5 μs of simulation. We postulate that the binding site is located at the solvent-exposed regions of GlyT2. Understanding the mechanism of action of these, and related bioactive lipids is essential in effectively developing high-affinity GlyT2 inhibitors for the treatment of pain.
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