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Size selective recognition of small esters by a negative allosteric hemicarcerand.

ABSTRACT: A bis(resorcinarene) substituted 2,2'-bipyridine was found to bind weakly to small esters like ethyl acetate whereas more bulky esters were not recognized by this hemicarcerand. This size selective molecular recognition could be controlled by a negative cooperative allosteric effect: coordination of a triscarbonyl rhenium chloride fragment to the bipyridine causes a conformational rearrangement that orientates the resorcinarene moieties in different directions so that they cannot act cooperatively in the binding of the substrate.

SUBMITTER: Staats H

PROVIDER: S-EPMC2870999 | biostudies-literature | 2010 Feb

REPOSITORIES: biostudies-literature

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Size selective recognition of small esters by a negative allosteric hemicarcerand.

Staats Holger H Lützen Arne A

Beilstein journal of organic chemistry 20100203

A bis(resorcinarene) substituted 2,2'-bipyridine was found to bind weakly to small esters like ethyl acetate whereas more bulky esters were not recognized by this hemicarcerand. This size selective molecular recognition could be controlled by a negative cooperative allosteric effect: coordination of a triscarbonyl rhenium chloride fragment to the bipyridine causes a conformational rearrangement that orientates the resorcinarene moieties in different directions so that they cannot act cooperative ...[more]

PMID: 20485592

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Project description:Perampanel (PMP) is a third generation antiseizure drug reported to be a potent and selective noncompetitive negative allosteric modulator of one sub-family of ionotropic glutamate receptor (iGluR), the α-amino-3-hydroxy-S-methylisoxazole-4-propionic acid receptors (AMPARs). However, the recent structural resolution of AMPARs in complex with PMP revealed that its binding pocket is formed from residues that are largely conserved in two members of another family of iGluRs, the GluK4 and GluK5 kainate receptor (KAR) subunits. We show here that PMP inhibits both recombinant and neuronal KARs, contrary to the previous reports, and that the NAM activity requires GluK5 subunits to be channel constituents. PMP inhibited heteromeric GluK1/GluK5 and GluK2/GluK5 KARs at IC50 values comparable to that for AMPA receptors but was much less potent on homomeric GluK1 or GluK2 KARs. The auxiliary subunits Neto1 or Neto2 also made GluK2-containing KARs more sensitive to inhibition. Finally, PMP inhibited mouse neuronal KARs containing GluK5 subunits and Neto proteins in nociceptive dorsal root ganglia neurons and hippocampal mossy fiber - CA3 pyramidal neuron synapses. These data suggest that clinical actions of PMP could arise from differential inhibition of AMPAR or KAR signaling and that more selective drugs might maintain antiseizure efficacy while reducing adverse effects.Significance Statement:Perampanel (PMP) is a regulatory approved antiseizure drug used for refractory partial-onset and generalized tonic-clonic seizures that acts as a selective negative allosteric modulator of α-amino-3-hydroxy-S-methylisoxazole-4-propionic acid receptors (AMPARs). Here we demonstrate that PMP inhibits kainate receptors (KARs), a second family of ionotropic glutamate receptors, in addition to AMPARs. NAM activity on KARs required GluK5 subunits or Neto auxiliary subunits as channel constituents. KAR inhibition therefore could contribute to PMP antiseizure action or the adverse effects that are significant with this drug. Drug discovery aimed at more selective allosteric modulators that discriminate between AMPARs and KARs could yield next-generation drugs with improved therapeutic profiles for treatment of epilepsy.

Dataset Information

Size selective recognition of small esters by a negative allosteric hemicarcerand.

Publications

Size selective recognition of small esters by a negative allosteric hemicarcerand.

Similar Datasets

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