High-Throughput Screening of Low Molecular Weight NS3-NS4A Protease Inhibitors Using a Fluorescence Resonance Energy Transfer Substrate

Author:

Sudo Kenji1,Yamaji Kayo2,Kawamura Kouich2,Nishijima Tomoko2,Kojima Naoko2,Aibe Kazuhiko2,Shimotohno Kunitada3,Shimizu Yasuaki2

Affiliation:

1. Rational Drug Design Laboratories, Fukushima, Japan

2. Institute for Drug Discovery Research, Yamanouchi Pharmaceutical Co. Ltd., Ibaraki, Japan

3. Virology Division, National Cancer Center Research Institute, Tokyo, Japan

Abstract

Hepatitis C virus (HCV) NS3-NS4A protease is an attractive target for anti-HCV agents because of its important role in replication. An optimized fluorescence resonance energy transfer (FRET) substrate for NS3-NS4A protease, based on the sequence of the NS5A-5B cleavage site, was designed and synthesized. High-throughput screening of in-house compound libraries was performed using a FRET substrate FS10 (MOCAc-DKIVPC-SMSYK-Dnp) and MBP-NS3-NS4A fusion protein. Several hit compounds were found, including YZ-9577 (2-oxido-1,2,5-oxadiazole-3,4-diyl) bis (phenylmethanone) with potent inhibitory activity (IC50=1.6 μM) and good selectivity against other human serine proteases.

Publisher

SAGE Publications

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