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Volume 78, Issue 1

Two mRNAs are transcribed from banana bunchy top virus DNA-1. Free

Abstract

We have mapped the mRNA transcripts of banana bunchy top virus (BBTV) DNA-1. Northern hybridization and 3′ RACE analysis identified two poly-adenylated RNAs associated with BBTV DNA-1. Previously, one major ORF in the virion sense of DNA-1 had been identified, which encoded a putative replication protein (Rep). An mRNA was identified in BBTV infected bananas that was clearly transcribed from this Rep ORF. Further, a second transcript was identified which mapped to an ORF completely within the Rep ORF. This encoded a putative 5 kDa protein of unknown function. Both these transcripts were also identified in a tobacco plant that had been transformed with harbouring a binary construct containing the Rep ORF from BBTV DNA-1. This Rep ORF was inserted 3′ of a cauliflower mosaic virus 35S promoter and 5′ of a vegetable storage protein terminator. The transcripts mapped from these tobacco plants were identical at the 3′ end to the transcripts from BBTV infected banana plants. The site of polyadenylation for the Rep ORF was at base 963 immediately 3′ of the translational stop codon confirming that the polyadenylation signals for this transcript were all within the ORF. However, the internal ORF had a large untranslated region of 272 bases with its site of polyadenylation at nucleotide 803 and a polyadenylation signal 3′ of the translational stop codon. A possible upstream termination signal (A/TTGTAA) was identified and was conserved within BBTV DNA-1 sequences from different international isolates.

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© Society for General Microbiology 1997
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1997-01-01
2024-04-25
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Two mRNAs are transcribed from banana bunchy top virus DNA-1.
J. Gen. Virol. 78, 229 (1997); https://doi.org/10.1099/0022-1317-78-1-229
/content/journal/jgv/10.1099/0022-1317-78-1-229
/content/journal/jgv/10.1099/0022-1317-78-1-229
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