Complete nucleotide sequence of an isolate of the nepovirus raspberry ringspot virus from grapevine

Abstract

The complete nucleotide sequence of the RNAs 1 and 2 of the nepovirus Raspberry ringspot virus cherry isolate (RpRSV-ch) from grapevine was determined. The RNA 1 is 7935 nucleotides (nt) long excluding the poly(A) tail, and contains one long open reading frame (ORF) encoding a polypeptide of 2367 amino acids. This ORF is preceeded by a 136 nt 5′ non-coding region, and followed by a 695 nt 3′ non-coding region. Conserved amino acid motifs, characteristic of the viral protease cofactor, the NTP-binding protein, proteinase and polymerase, were found in the sequence of the RNA 1-encoded polyprotein. The RNA 2 is 3915 nt long excluding the poly(A) tail, and contains one long ORF encoding a polypeptide of 1106 amino acids. This ORF is preceeded by a 203 nt 5′ non-coding region, and followed by a 390 nt 3′ non-coding region. When compared to the corresponding sequences of other nepoviruses, a maximum level of 34% identity was found between the RNA 1-encoded polypetides of RpRSV-ch and other nepoviruses. For the RNA 2-encoded polypeptide, 88% identity was found between RpRSV-ch and RpRSV-S, a Scottish isolate of RpRSV from raspberry, and a maximum 29% identity between RpRSV-ch and other nepoviruses.