The viral capping enzyme nsP1: a novel target for the inhibition of chikungunya virus infection


The chikungunya virus (CHIKV) has become a substantial global health threat due to its massive re-emergence, the considerable disease burden and the lack of vaccines or therapeutics. We discovered a novel class of small molecules ([1,2,3]triazolo[4,5-d]pyrimidin-7(6H)-ones) with potent in vitro activity against CHIKV isolates from different geographical regions. Drug-resistant variants were selected and these carried a P34S substitution in non-structural protein 1 (nsP1), the main enzyme involved in alphavirus RNA capping. Biochemical assays using nsP1 of the related Venezuelan equine encephalitis virus revealed that the compounds specifically inhibit the guanylylation of nsP1. This is, to the best of our knowledge, the first report demonstrating that the alphavirus capping machinery is an excellent antiviral drug target. Considering the lack of options to treat CHIKV infections, this series of compounds with their unique (alphavirus-specific) target offers promise for the development of therapy for CHIKV infections.

DOI: 10.1038/srep31819

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@inproceedings{Delang2016TheVC, title={The viral capping enzyme nsP1: a novel target for the inhibition of chikungunya virus infection}, author={Leen Delang and Chouyang Li and Ali Taş and Gilles Qu{\'e}rat and Irina Cristina Albulescu and Tine De Burghgraeve and Nina Guerrero and Alba Gigante and G{\'e}raldine Piorkowski and Etienne Decroly and Dirk Jochmans and Bruno Canard and Eric J. Snijder and Mar{\'i}a Jes{\'u}s P{\'e}rez-P{\'e}rez and Martijn J. van Hemert and Bruno Coutard and Pieter Leyssen and Johann Neyts}, booktitle={Scientific reports}, year={2016} }