@phdthesis{Scheitl2023, author = {Scheitl, Carolin P. M.}, title = {In vitro selected ribozymes for RNA methylation and labeling}, doi = {10.25972/OPUS-33004}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-330049}, school = {Universit{\"a}t W{\"u}rzburg}, year = {2023}, abstract = {The focus of this work was the development and application of highly efficient RNA catalysts for the site-specific modification of RNA with special focus on methylation. In the course of this thesis, the first methyltransferase ribozyme (MTR1), which uses m6G as the methyl group donor was developed and further characterized. The RNA product was identified as the natural modification m1A. X-Ray crystallography was used to solve the 3D structure of the ribozyme, which directly suggested a plausible reaction meachnism. The MTR1 ribozyme was also successfully repurposed for a nucleobase transformation reaction of a purine nucleoside. This resulted in a formyl-imidazole moiety directly on the intact RNA, which was directly used for further bioconjugation reactions. Finally, additional selections and reselections led to the identification of highly active alkyltransferase ribozymes that can be used for the labeling of various RNA targets}, subject = {Methylierung}, language = {en} }