作者:Alejandro Meco-Navas、Godwin U. Ebiloma、Ana Martín-Domínguez、Irene Martínez-Benayas、Eduardo J. Cueto-Díaz、Amani Saud Alhejely、Emmanuel O. Balogun、Machi Saito、Miho Matsui、Natsumi Arai、Tomoo Shiba、Shigeharu Harada、Harry P. de Koning、Christophe Dardonville
DOI:10.1021/acsmedchemlett.8b00282
日期:2018.9.13
The SAR of 4-hydroxybenzaldehyde inhibitors of the trypanosome alternative oxidase (TAO), a critical enzyme for the respiration of bloodstream forms of trypanosomes, was investigated. Replacing the aldehyde group with a methyl ester resulted in a 10-fold increase in TAO inhibition and activity against T. brucei. Remarkably, two analogues containing the 2-hydroxy-6-methyl scaffold (9e and 16e) displayed single digit nanomolar TAO inhibition, which constitute the most potent 4-alkoxybenzoic acid derivatives described to date. 9e was 50-times more potent against TAO and 10-times more active against T. brucei compared to its benzaldehyde analogue 1. The farnesyl derivative 16e was as potent a TAO inhibitor as ascofuranone with IC50 = 3.1 nM. Similar to ascofuranone derivatives, the 2-hydroxy and 6-methyl groups seemed essential for low nanomolar TAO inhibition of acid derivatives, suggesting analogous binding interactions with the TAO active site.