Abstract
In this study, we describe a site-specific strategy to rapidly and precisely localize D-amino acids in peptides by ion mobility spectrometry (IMS) analysis of mass spectrometry (MS)-generated epimeric fragment ions. Briefly, the D/L-peptide epimers are separated by online reversed-phase liquid chromatography (LC) and fragmented by collision induced dissociation (CID), followed by IMS analysis. The epimeric fragment ions resulting from D/L-peptide epimers exhibit arrival time differences, thus showing different mobility in IMS. The arrival time shift between the epimeric fragment ions is used as criteria to localize the D-amino acid substitution. We provide the technical details on sample preparation, LC-tandem mass spectrometry analysis, data processing, and collisional cross-section calibration.
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Acknowledgements
This work is supported in part by the National Institutes of Health (NIH) grant (R01DK071801 to LL) and the National Science Foundation grant (CHE-1413596 to LL). LL acknowledges an H. I. Romnes Faculty Research Fellowship from UW-Madison, Tianjin 1000 Talent Plan from Tianjin China and Changjiang Professorship from the Chinese Ministry of Education. C.L. acknowledges an NIH-supported Chemistry Biology Interface Training Program Predoctoral Fellowship (grant number T32-GM008505) and an NSF Graduate Research Fellowship (DGE-1256259). We are grateful to Prof. Jonathan V. Sweedler, Dr. Lu Bai, and Itamar Livnat (UIUC) for helpful discussions and insightful suggestions on this project.
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Jia, C., Lietz, C.B., Yu, Q., Li, L. (2016). Site-specific Localization of D-Amino Acids in Bioactive Peptides by Ion Mobility Spectrometry. In: Grant, J., Li, H. (eds) Analysis of Post-Translational Modifications and Proteolysis in Neuroscience. Neuromethods, vol 114. Humana Press, New York, NY. https://doi.org/10.1007/7657_2015_82
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DOI: https://doi.org/10.1007/7657_2015_82
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