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Crosslinking Methods to Identify RNA Methyltransferase Targets In Vivo

  • Sara Haag
  • Jens Kretschmer
  • Katherine E. Sloan
  • Markus T. BohnsackEmail author
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1562)

Abstract

Several crosslinking methods have been developed to identify interacting RNAs for proteins of interest. Here, we describe variants of the UV crosslinking and analysis of cDNA (CRAC) method that allow target identification of RNA methyltransferases on a genome-wide scale. We present a detailed protocol for the application of CRAC in human cells that stably express the protein of interest fused to a tandem affinity tag. After the introduction of a covalent link between the protein and its target RNAs, protein-RNA complexes are purified and bound RNAs trimmed, ligated to adapters, reverse transcribed, and amplified. Sequences obtained from next-generation sequencing are then mapped onto the human genome allowing the identification of possible substrates. For some RNA methyltransferases, e.g., m5C MTases, their catalytic mechanism can be exploited for chemical crosslinking approaches instead of UV based crosslinking.

Key words

UV crosslinking CRAC Methyltransferase CLIP 5-Methylcytosine 5-Azacytidine 

Notes

Acknowledgments

This work was supported by the Deutsche Forschungsgemeinschaft (SPP 1784: BO3442/2-1 to M.T.B.), the Alexander von Humboldt Foundation (K.E.S. and M.T.B.), and the Faculty of Medicine, Georg-August-University Göttingen (M.T.B. and “Startförderung” to S.H.).

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Copyright information

© Springer Science+Business Media LLC 2017

Authors and Affiliations

  • Sara Haag
    • 1
  • Jens Kretschmer
    • 1
  • Katherine E. Sloan
    • 1
  • Markus T. Bohnsack
    • 1
    • 2
    Email author
  1. 1.Centre for Biochemistry and Molecular Cell BiologyInstitute for Molecular Biology, Georg-August-UniversityGöttingenGermany
  2. 2.Göttingen Centre for Molecular BiosciencesGeorg-August-UniversityGöttingenGermany

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