Quantitative structure-activity relationships of 1,3,4-thiadiazol-2(3H)-ones and 1,3,4-oxadiazol-2(3H)-ones as human protoporphyrinogen oxidase inhibitors.

Abstract:

:Protoporphyrinogen oxidase (Protox, EC 1.3.3.4) has attracted great interest during the last decades due to its unique biochemical characteristics and biomedical significance. As a continuation of our research work on the development of new PPO inhibitors, 23 new 1,3,4-thiadiazol-2(3H)-ones bearing benzothiazole substructure were designed and synthesized. The in vitro assay indicated that the newly synthesized compounds 1a-w displayed good inhibition activity against human PPO (hPPO) with K(i) values ranging from 0.04μM to 245μM. To the knowledge, compound 1a, O-ethyl S-(5-(5-(tert-butyl)-2-oxo-1,3,4-thiadiazol-3(2H)-yl)-6-fluorobenzothiazol-2-yl)carbonothioate, with the K(i) value of 40nM, is so far known as the most potent inhibitor against hPPO. Based on the molecular docking and modified molecular mechanics/Poisson-Boltzmann surface area (MM-PBSA) calculations, the quantitative structure-activity relationships of 1,3,4-thiadiazol-2(3H)-ones and 1,3,4-oxadiazol-2(3H)-one derivatives were established with excellent correlation relationships (r(2)=0.81) between the calculated and experimental binding free energies. Some important insights were also concluded for guiding the future rational design of new hPPO inhibitors with improved potency.

journal_name

Bioorg Med Chem

authors

Zuo Y,Yang SG,Jiang LL,Hao GF,Wang ZF,Wu QY,Xi Z,Yang GF

doi

10.1016/j.bmc.2011.10.079

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

296-304

issue

1

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(11)00906-0

journal_volume

20

pub_type

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