RNA-directed RNA polymerase from tomato leaves. II. Catalytic in vitro properties - PubMed (original) (raw)
. 1993 Jun 5;268(16):11858-67.
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- PMID: 7685023
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RNA-directed RNA polymerase from tomato leaves. II. Catalytic in vitro properties
W Schiebel et al. J Biol Chem. 1993.
Free article
Abstract
The catalytic properties of electrophoretically homogeneous RNA-directed RNA polymerase (RdRP, EC 2.7.7.48) from tomato leaf tissue were studied with the aid of oligonucleotides of defined sequence. It was found that RdRP catalyzes in vitro the transcription of short single-stranded RNA and DNA molecules into precisely complementary RNA copies up to the full length of these templates. The transcription of RNA- and DNA-oligonucleotide templates was equally effective. Differences in transcription efficiency were found to depend on nucleotide sequence rather than on the RNA or DNA nature of the single-stranded nucleic acid. Double-stranded nucleic acids such as poly(A).poly(U) and a double-stranded DNA 14-mer were not transcribed. The RdRP-directed transcription could be primed because RNA and DNA dinucleotides and trinucleotides complementary to the 3'-terminal nucleotides of the template were extended by the enzyme. The unprimed transcription was shown to start preferentially at the 3'-terminal nucleotides of the template. RdRP is capable of adding a single noncomplementary nucleotide to the 3' terminus of about 50% of the runoff transcripts. AMP was preferred over GMP, whereas CMP and UMP were terminally added at very low frequency.
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