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A novel type of RNA ligase activity in extracts of wheat germ or Chlamydomonas requires 2', 3'-cyclic phosphate and 5'-phosphate ends for ligation to form a 2'-phosphomonoester, 3',5'-phosphodiester bond. Using 5'-3 2P-labeled linear PSTV, we demonstrate that RNase T1-nicked viroid predominantly forms (formula; see text) U-bonds. Natural linear PSTV, however, forms mainly (formula; see text) A-bonds upon enzymatic circularization. We show that natural linear PSTV RNA has nicks between C181 and A182, or between C348 and A349, and that consequently C181 and C348 carry 2',3'-cyclophosphate termini.

nucleic acids research

Circularization of linear viroid RNA via 2′-phosphomonoester, 3′, 5′-phosphodiester bonds by a novel type of RNA ligase from wheat germ and<i>Chlamydomonas</i>

Circularization of linear viroid RNA via 2′-phosphomonoester, 3′, 5′-phosphodiester bonds by a novel type of RNA ligase from wheat germ andChlamydomonas