Conformationally Restricted GABA with Bicyclo[3.1.0]hexane Backbone as the First Highly Selective BGT-1 Inhibitor

  • ACS Med Chem Lett. 2014 Jun 16;5(8):889-93. doi: 10.1021/ml500134k.
Takaaki Kobayashi  1 ,  Akihiro Suemasa  1 ,  Arisa Igawa  1 ,  Soichiro Ide  1 ,  Hayato Fukuda  1 ,  Hiroshi Abe  1 ,  Mitsuhiro Arisawa  1 ,  Masabumi Minami  1 ,  Satoshi Shuto  2
Affiliations
  • 1. Faculty of Pharmaceutical Sciences, Hokkaido University , Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan.
  • 2. Faculty of Pharmaceutical Sciences, Hokkaido University , Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan ; Center for Research and Education on Drug Discovery, Hokkaido University , Kita-ku, Sapporo 060-0812, Japan.
PMID: 25147609 DOI: 10.1021/ml500134k
Abstract

On the basis of the three-dimensional diversity-oriented conformational restriction strategy using key chiral cyclopropane units, we previously identified 3 ((2S,3R)-4-amino-3,4-methanobutyric acid) with a chiral trans-cyclopropane structure as a γ-aminobutyric acid (GABA) transporter inhibitor selective for GABA transporter (GAT) subtypes GAT-3 and BGT-1 (betaine/GABA transporter-1). Further conformational restriction of 3 with the rigid bicyclo[3.1.0]hexane backbone led to the successful development of the first highly potent and selective BGT-1 inhibitor 4 (IC50 = 0.59 μM). The bioactive conformation of 3 for BGT-1 was also identified.

Keywords
BGT-1; GABA; GAT; conformational restriction; cyclopropane.