Abstract
Di-tyrosine is one of the major protein cross-links involved in a large number of neurodegenerative or ageing-related diseases. Recently, no less than four different di-tyrosine bridge isomers have been highlighted while only two structures are characterized at the moment in the literature. In this study, the four dimers were produced by radiolytical-induced oxidation. Although the abundance of these additional dimers precluded the use of NMR or other structural characterization methods, we propose a new methodology combining UPLC-MS analysis, specific deuterium labelling and isotopic (H/D) exchanges with the solvent. Thus, we were able to identify three different covalent cross-links and propose different new original di-tyrosine structures based on double Michael additions, leading to tetracyclic products. Absorption and fluorescence characterizations of the four species were performed and consolidate our proposal.
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Abbreviations
- DOPA:
-
Dihydroxyphenylalanine
- FLD:
-
Fluorescence detection
- H/D:
-
Hydrogen/deuterium
- HOHICA:
-
3A-Hydroxy-6-oxo-2,3,3a,6,7,7a-hexa-hydro-1H-indole-2-carboxylic acids
- HPLC:
-
High-performance liquid chromatography
- MAD:
-
Michael addition dimer
- MS:
-
Mass spectrometry
- NMR:
-
Nuclear magnetic resonance
- NOE:
-
Nuclear Overhauser effect
- PDA:
-
Photo diode array detector
- UPLC:
-
Ultra high-performance liquid chromatography
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Funding
This research did not receive any direct specific grant from funding agencies in the public, commercial or not-for-profit sectors. Access to the UPLC-MS was funded as the MOBICS project funded by a DIM Analytics programme from the Ile-de-France region.
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Experiments were performed by I. Billault, A. Gatin and C. Sicard-Roselli. The manuscript was written by I. Billault, A. Gatin C. Sicard-Roselli and G. Van der Rest.
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Billault, I., Gatin, A., Van der Rest, G. et al. Advanced methodology combining UPLC-MS, isotopic labelling and H/D exchanges reveals three tyrosine-tyrosine cross-links induced by oxidative radicals evolving to at least four dimeric structures. Anal Bioanal Chem 414, 1595–1607 (2022). https://doi.org/10.1007/s00216-021-03782-x
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DOI: https://doi.org/10.1007/s00216-021-03782-x