期刊
JOURNAL OF MASS SPECTROMETRY
卷 56, 期 4, 页码 -出版社
WILEY
DOI: 10.1002/jms.4594
关键词
CID; ESI-MS; isomers; methyl nucleosides
资金
- National Natural Science Foundation of China [21976005, 21572016]
- Ministry of Science and Technology of the People's Republic of China [2012CB720601]
In this study, ESI-MS coupled with CID was used to distinguish the isomeric methyl nucleosides by analyzing their fragmentation patterns and molecular structures. Structurally relevant fragments were obtained to efficiently identify the isomerides, providing a promising method for quantitative study and detection of unknown methyl nucleosides.
The methyl-modified nucleosides (methyladenosine, methylguanosine, methylcytidine, and methyluridine) occur widely in nucleic acids and serve as biomarkers for a variety of types of diseases. Their isomers have the same parent ions in MS spectra and need further discrimination. Here, electrospray ionization mass spectrometry (ESI-MS) coupled with collision induced dissociation (CID) was used to distinguish the common isomerides of methyl-nucleosides. The various fragmentation patterns had been discussed in comparison of the different methyl modified nucleosides and were studied as a function of normalized collision energy. Then, structurally relevant fragments were obtained to efficiently identify characterization of methyl-nucleoside isomerides by collision induced dissociation. Therefore, this study provides a promising method using CID-MS for the discrimination of the isomeric methyl nucleosides, which could be useful to quantitative study of methyl nucleosides and detect of unknown methyl nucleosides.
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