On the origin of the 2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylate scaffold's unique group II selectivity for the mGlu receptors

Bioorg Med Chem Lett. 2019 Jan 15;29(2):297-301. doi: 10.1016/j.bmcl.2018.11.033. Epub 2018 Nov 16.

Abstract

Analogs based on the 2-aminobicyclo[3.1.0]hexane-2,6-dicarboxylate scaffold showed high potency and selectivity as both group II mGlu receptors orthosteric agonists and antagonists. This scaffold was initially designed to mimic the fully extended glutamate backbone conformation that was hypothesized to be the active conformation for the group II mGlu receptors. With the availability of crystal structures of l-Glu-bound amino terminal domain proteins from multiple mGlu receptor subtypes spanning all three subgroups, a new steric hindrance hypothesis was proposed to account for the scaffold's unique group II selectivity that explores the subtle distance differences between the α-carbon of l-Glu and the center of the tyrosine phenyl ring from the bottom lobe (e.g. Y216 of mGlu2).

Keywords: Conformation; Group selectivity; Scaffold; X-ray crystal structures; mGlu receptor.

MeSH terms

  • Amino Acids, Cyclic / chemistry
  • Amino Acids, Cyclic / pharmacology*
  • Animals
  • Dicarboxylic Acids / chemistry
  • Dicarboxylic Acids / pharmacology*
  • Dose-Response Relationship, Drug
  • Humans
  • Molecular Structure
  • Rats
  • Receptors, Metabotropic Glutamate / agonists*
  • Receptors, Metabotropic Glutamate / antagonists & inhibitors*
  • Receptors, Metabotropic Glutamate / metabolism
  • Structure-Activity Relationship

Substances

  • 2-aminobicyclo(3.1.0)hexane-2,6-dicarboxylate
  • Amino Acids, Cyclic
  • Dicarboxylic Acids
  • Receptors, Metabotropic Glutamate