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Journal Article
Research Support, N.I.H., Extramural
Review
Structure determination of group II introns.
Methods : a Companion to Methods in Enzymology 2017 August 2
Group II introns are self-splicing catalytic RNAs that are able to excise themselves from pre-mRNAs using a mechanism identical to that utilized by the spliceosome. Both structural and phylogenetic data support the hypothesis that group II introns and the spliceosome share a common ancestor. Structures of group II introns have given insight into the active site required for the catalysis of RNA splicing. This review outlines crucial aspects of the structure determination of group II introns such as sample preparation and data processing. Given that group II introns are large RNAs that must be synthesized through in vitro transcription, there are special considerations that must be taken into account in terms of purification and crystallization, as compared to the isolation of large intact ribonucleoprotein complexes such as the ribosome. We specifically focus on the methodology used to determine the structure of the eukaryotic group II intron lariat from the brown algae Pylaiella littoralis. The techniques described in this review can also be applied for the structure determination of other large RNAs.
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