Synthesis and Structure-Activity Relationship Studies of N-monosubstituted Aroylthioureas as Urease Inhibitors

Author(s): Wei-Wei Ni, Hai-Lian Fang, Ya-Xi Ye, Wei-Yi Li, Li Liu, Zi-Juan Fu, Dawalamu, Wen-Yan Zhu, Ke Li, Fang Li, Xia Zou, Hui Ouyang, Zhu-Ping Xiao*, Hai-Liang Zhu*

Journal Name: Medicinal Chemistry

Volume 17 , Issue 9 , 2021

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Background: Thiourea is a classical urease inhibitor which is usually used as a positive control, and many N,N'-disubstituted thioureas have been determined as urease inhibitors. However, due to steric hindrance, N,N'-disubstituted thiourea motif could not bind urease as thiourea. On the contrary, N-monosubstituted thiourea with a tiny thiourea motif could theoretically bind into the active pocket as thiourea.

Objective: A series of N-monosubstituted aroylthioureas were designed and synthesized for evaluation as urease inhibitors.

Methods: Urease inhibition was determined by the indophenol method and IC50 values were calculated using computerized linear regression analysis of quantal log dose-probit functions. The kinetic parameters were estimated via surface plasmon resonance (SPR) and by nonlinear regression analysis based on the mixed type inhibition model derived from Michaelis-Menten kinetics.

Results: Compounds b2, b11, and b19 reversibly inhibited urease with a mixed mechanism, and showed excellent potency against both cell-free urease and urease in the intact cell, with IC50 values being 90- to 450-fold and 5- to 50-fold lower than the positive control acetohydroxamic acid, respectively. The most potent compound b11 showed an IC50 value of 0.060 ± 0.004μM against cell-free urease, which bound to urea binding site with a very low KD value (0.420±0.003nM) and a very long residence time (6.7 min). Compound b11 was also demonstrated to have very low cytotoxicity to mammalian cells.

Conclusion: The results revealed that N-monosubstituted aroylthioureas bound to the active site of urease as expected, and represent a new class of urease inhibitors for the development of potential therapeutics against infections caused by urease-containing pathogens.

Keywords: N-monosubstituted aroylthioureas, Reversible urease inhibitor, Helicobacter pylori, Surface plasmon resonance, Molecular docking, Cytotoxicity.

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Article Details

Year: 2021
Page: [1046 - 1059]
Pages: 14
DOI: 10.2174/1573406416999200818152440
Price: $95

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