You XJ, Yuan BF. Detecting Internal N7-Methylguanosine mRNA Modifications by
Differential Enzymatic Digestion Coupled with Mass Spectrometry Analysis.
Methods Mol Biol 2021;
2298:247-59. [PMID:
34085250 DOI:
10.1007/978-1-0716-1374-0_16]
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Abstract
The recent discovery of reversible chemical modifications on mRNA has opened a new era of post-transcriptional gene regulation in eukaryotes. Among these modifications identified in eukaryotic mRNA, N7-methylguanosine (m7G) is unique owing to its presence in the 5' cap structure. Recently, it has been reported that m7G also exists internally in mRNA. Here, we describe a protocol of combining differential enzymatic digestion with liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) analysis to detect internal m7G modification in mRNA. This protocol can also be used to quantify the level of m7G at both the 5' cap and internal positions of mRNA.
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