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Development of a red-shifted fluorescence-based assay for SARS-coronavirus 3CL protease: identification of a novel class of anti-SARS agents from the tropical marine sponge Axinella corrugata

  • Pamela Hamill , Derek Hudson , Richard Y. Kao , Polly Chow , Meera Raj , Hongyan Xu , Martin J. Richer and François Jean
Published/Copyright: August 9, 2006
Biological Chemistry
From the journal Volume 387 Issue 8

Abstract

SARS-coronavirus (SARS-CoV) encodes a main protease, 3CLpro, which plays an essential role in the viral life cycle and is currently the prime target for discovering new anti-coronavirus agents. In this article, we report our success in developing a novel red-shifted (RS) fluorescence-based assay for 3CLpro and its application for identifying small-molecule anti-SARS agents from marine organisms. We have synthesised and characterised the first generation of a red-shifted internally quenched fluorogenic substrate (RS-IQFS) for 3CLpro based on resonance energy transfer between the donor and acceptor pair CAL Fluor Red 610 and Black Hole Quencher-1 (Km and kcat values of 14 μM and 0.65 min-1). The RS-IQFS primary sequence was selected based on the results of our screening analysis of 3CLpro performed using a series of blue-shifted (BS)-IQFSs corresponding to the 3CLpro-mediated cleavage junctions of the SARS-CoV polyproteins. In contrast to BS-IQFSs, the RS-IQFS was not susceptible to fluorescence interference from coloured samples and allowed for successful screening of marine natural products and identification of a coumarin derivative, esculetin-4-carboxylic acid ethyl ester, a novel 3CLpro inhibitor (IC50=46 μM) and anti-SARS agent (EC50=112 μM; median toxic concentration >800 μM) from the tropical marine sponge Axinella corrugata.

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Published Online: 2006-08-09
Published in Print: 2006-08-01

©2006 by Walter de Gruyter Berlin New York

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