1887

Abstract

The 3′ untranslated regions (UTRs) of the three genomic RNAs of alfalfa mosaic virus consist of a 3′ homologous sequence of 145 nt and upstream unique sequences 18–34 nt in length. Mutations were made in the 3′ UTR of a cDNA clone of RNA3. Point mutations in five AUGC motifs which interfere with specific binding of coat protein to the 3′ UTR had no effect on template activity of RNA3 for minus-strand RNA synthesis by purified viral RNA-dependent RNA polymerase (RdRp). Deletion analysis showed that the 3′ homologous sequence of 145 nt was sufficient for a low level of template activity in the RdRp assay and a similarly low level of RNA3 accumulation in plants. The presence of an additional sequence of nucleotides 145–165 from the 3′ end of RNA3 enhanced template recognition by RdRp and accumulation of RNA3 to wild-type levels.

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/content/journal/jgv/10.1099/0022-1317-78-11-3045
1997-11-01
2022-05-27
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