Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 26, Pages 7893-7897Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201713188
Keywords
LC-MS; radical-SAM enzymes; RNA modifications; isotope labelling; thioacetals
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Funding
- DFG SPP1784 [HE 3397-13/1, HE 3397-14/1]
- NRW.Nachwuchsgruppen program of the Ministry of Science Northrine-Westfalia (MIWF)
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Recently discovered new chemical entities in RNA modifications have involved surprising functional groups that enlarge the chemical space of RNA. Using LC-MS, we found over 100 signals of RNA constituents that contained a ribose moiety in tRNAs from E. coli. Feeding experiments with variegated stable isotope labeled compounds identified 37 compounds that are new structures of RNA modifications. One structure was elucidated by deuterium exchange and high-resolution mass spectrometry. The structure of msms(2)i(6)A (2-methylthiomeihylenethio-N6-isopentenyl-adenosine) was confirmed by methione-D3 feeding experiments and by synthesis of the nucleobase. The mssms(2)i(6)Acontains a thioacetal, shown in vitro to be biosynthetically derived from ms(2)i(6)A by the radical-SAM enzyme MiaB. This enzyme performs thiomethylation, forming ms(2)i(6)A from i(6)A in a first turnover. The new thioacetal is formed by a second turnover. Along with the pool of 36 new modifications, this work describes a new layer of RNA modification chemistry.
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