1887

Abstract

DNA clones complementary to the 3′-terminal 3426 nucleotides of the genomic RNA of the carlavirus chrysanthemum virus B (CVB) have been sequenced. The sequence contains six open reading frames (ORFs) which encode putative proteins (in the 5′ → 3′ direction) of 25749 (ORF2), 11435 (ORF3), 6984 (ORF4), the triple gene block proteins, a protein 34638 (ORF5); the coat protein, and a protein of 12609 (ORF6). The latter protein is basic and contains a putative zinc finger motif. The 5′-proximal ORF1 encodes a product with substantial homology to the C-terminal portions of the putative RNA replicases of two other carlaviruses, potato viruses M and S. The analysis of the minus-sense sequence shows one ORF which encodes a polypeptide of 16817. The sequenced portion of the CVB genomic RNA contains three short internal non-coding regions, two of which are typical for carlaviruses (those between ORFs 1 and 2, and between ORFs 4 and 5), and one (between ORFs 5 and 6) is unusual. There is significant similarity in the amino acid sequences of the CVB RNA-encoded proteins and the corresponding proteins of other carlaviruses.

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1991-10-01
2022-08-10
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