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

Takaaki Kobayashi; Akihiro Suemasa; Arisa Igawa; Soichiro Ide; Hayato Fukuda; Hiroshi Abe; Mitsuhiro Arisawa; Masabumi Minami; Satoshi Shuto

doi:10.1021/ml500134k

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. eCollection 2014 Aug 14.

Authors

Takaaki Kobayashi¹, Akihiro Suemasa¹, Arisa Igawa¹, Soichiro Ide¹, Hayato Fukuda¹, Hiroshi Abe¹, Mitsuhiro Arisawa¹, Masabumi Minami¹, Satoshi Shuto²

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.

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.