Abstract
The nucleotide sequence immediately in front of the initiation site for subgenomic RNA 4 synthesis on RNA 3 minus strand, which has been proved to function as a core promoter, was inspected for secondary structure in 26 species of the plant virus family Bromoviridae. In 23 cases a stable hairpin could be predicted at a distance of 3 to 8 nucleotides from the initiation site of RNA 4. This hairpin contained several conserved nucleotides that are essential for core promoter activity in brome mosaic virus (R.W. Siegel, S. Adkins and C.C. Kao, Proc. Natl. Acad. Sci. USA 94, 11238–11243, 1997). Phylogenetic evidence and evidence from the effect of artificial mutations reported in the literature (E.A.G. van der Vossen, T. Notenboom and J.F. Bol, Virology 212, 663–672, 1995) indicate that the stem-loop structure is essential for promoter activity in alfalfa mosaic virus and probably in other Bromoviridae. Stability of the hairpin is most pronounced in the genera Alfamovirus and Ilarvirus which display genome activation by coat protein. The hypothesis is put forward that with these viruses the coat protein is needed for the viral RNA polymerase to interact with the core promoter hairpin leading to access for the enzyme to the initiation site of RNA 4.
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Jaspars, E. A Core Promoter Hairpin is Essential for Subgenomic RNA Synthesis in Alfalfa Mosaic Alfamovirus and is Conserved in other Bromoviridae. Virus Genes 17, 233–242 (1998). https://doi.org/10.1023/A:1008065704102
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DOI: https://doi.org/10.1023/A:1008065704102