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. 1989 Jul;86(13):4823–4827. doi: 10.1073/pnas.86.13.4823

Derivation of an infectious viral RNA by autolytic cleavage of in vitro transcribed viral cDNAs.

A M Dzianott 1, J J Bujarski 1
PMCID: PMC297507  PMID: 2740329

Abstract

An in vitro transcription system has been developed that utilizes self-processing to adjust 3' termini in transcribed viral RNAs. Transcription vectors were constructed by ligating a cDNA "cassette" containing self-cleavage sequences from the satellite RNA of tobacco ringspot virus (STobRV RNA) with the 3' end of brome mosaic virus (BMV) cDNA clones. Transcripts were obtained either from templates linearized at positions located downstream from the cassette or from nonlinearized plasmids. In both cases, a spontaneous self-cleavage reaction produced BMV RNAs that contained 19 heterologous nucleotides at their 3' ends. These RNAs were biologically active, indicating that 19 extra nucleotides did not remove the infectivity. The progeny BMV RNA isolated from infected plants did not retain the 19-base heterologous sequence. BMV RNAs containing longer 3' heterologous sequences were not infectious. The STobRV self-cleavage cassette is potentially applicable to a variety of RNA systems.

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