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Nucleotide sequence of carnation ringspot dianthovirus RNA-1

¹ Institute of Agricultural Biotechnology, Moscow 127253, Russia
and² Department of Plant Pathology, Box 7616, North Carolina State University, Raleigh, North Carolina 27695-7616, U.S.A.

The nucleotide sequence of carnation ringspot virus (CRSV) RNA-1, the type member of the dianthovirus genus, has been determined. The 3756 nucleotide genomic RNA-1 contains three large open reading frames (ORFs), capable of encoding 27K, 54K and 38K polypeptides. In addition, a small ORF encoding a 10K polypeptide at the 3' terminus of the RNA has been identified. The gene organization of CRSV RNA-1 is similar to those of red clover necrotic mosaic (RCNMV) and sweet clover necrotic mosaic (SCNMV) diantho-viruses with the exception that CRSV RNA-1 contains the additional 3'-terminal ORF. The 27K and 54K proteins possess significant sequence similarity to corresponding polypeptides of the other dianthoviruses. The 54K protein also contains the conserved RNA-dependent RNA polymerase motif. The identification of a shifty heptanucleotide preceding the p27 ORF termination codon and a predicted secondary structure following the terminator suggest that a translational frameshifting event allows translation to continue past the p27 ORF into the p54 ORF, which is in the -1 frame, generating an 88K fusion protein. Amino acid sequence alignment of the 38K protein with the corresponding RCNMV and SCNMV polypeptides indicate that this is the viral capsid protein.

Received 14 June 1993; accepted 3 September 1993.

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