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. 1985 Mar;4(3):817–822. doi: 10.1002/j.1460-2075.1985.tb03703.x

2' phosphomonoester, 3'-5' phosphodiester bond at a unique site in a circular viral RNA.

P A Kiberstis, J Haseloff, D Zimmern
PMCID: PMC554262  PMID: 2408885

Abstract

Solanum nodiflorum mottle virus (SNMV) RNA2 is a single-stranded, covalently closed circular molecule. RNase T2 or nuclease P1 digests of this RNA contain a minor nucleotide of unusual chromatographic and electrophoretic mobility. This nucleotide is resistant to further digestion by T2 or P1 ribonucleases, or by alkali, but is sensitive to venom phosphodiesterase digestion. Alkaline phosphatase digestion yields a product which is RNase T2 and P1 sensitive. The products of these various digests show that the minor nucleotide is a ribonuclease-resistant dinucleotide carrying a 2' phosphomonoester group with the core structure C2'p3'p5'A. This dinucleotide is found in a unique RNase T1 product of SNMV RNA2, thus establishing a unique location in the sequence for the 2' phosphomonoester group at residue 49. Identical results have been obtained with a second related virus. The phosphomonoester group probably results from the RNA ligation event by which the molecules were circularised.

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