Expanding Repertoire of Plant Positive-Strand RNA Virus Proteases
AbstractMany plant viruses express their proteins through a polyprotein strategy, requiring the acquisition of protease domains to regulate the release of functional mature proteins and/or intermediate polyproteins. Positive-strand RNA viruses constitute the vast majority of plant viruses and they are diverse in their genomic organization and protein expression strategies. Until recently, proteases encoded by positive-strand RNA viruses were described as belonging to two categories: (1) chymotrypsin-like cysteine and serine proteases and (2) papain-like cysteine protease. However, the functional characterization of plant virus cysteine and serine proteases has highlighted their diversity in terms of biological activities, cleavage site specificities, regulatory mechanisms, and three-dimensional structures. The recent discovery of a plant picorna-like virus glutamic protease with possible structural similarities with fungal and bacterial glutamic proteases also revealed new unexpected sources of protease domains. We discuss the variety of plant positive-strand RNA virus protease domains. We also highlight possible evolution scenarios of these viral proteases, including evidence for the exchange of protease domains amongst unrelated viruses. View Full-Text
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Mann, K.S.; Sanfaçon, H. Expanding Repertoire of Plant Positive-Strand RNA Virus Proteases. Viruses 2019, 11, 66.
Mann KS, Sanfaçon H. Expanding Repertoire of Plant Positive-Strand RNA Virus Proteases. Viruses. 2019; 11(1):66.Chicago/Turabian Style
Mann, Krin S.; Sanfaçon, Hélène. 2019. "Expanding Repertoire of Plant Positive-Strand RNA Virus Proteases." Viruses 11, no. 1: 66.
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