RNA Silencing Suppression by a Second Copy of the P1 Serine Protease of<i>Cucumber Vein Yellowing Ipomovirus</i>, a Member of the Family<i>Potyviridae</i>That Lacks the Cysteine Protease HCPro

Abstract excerpt

The P1 protein of viruses of the family Potyviridae is a serine proteinase, which is highly variable in length and sequence, and its role in the virus infection cycle is not clear. One of the proposed activities of P1 is to assist HCPro, the product that viruses of the genus Potyvirus use to counteract antiviral defense mediated by RNA silencing. Indeed, an HCPro-coding region is present in all the genomes of...

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