Abstract
Protein and peptide oxidation is a key feature in the progression of a variety of disease states and in the poor performance of protein-based products. The present work demonstrates a mass spectrometry-based approach to profiling degradation at the amino acid residue level. Synthetic peptides containing the photosensitive residues, tryptophan and tyrosine, were used as models for protein-bound residue photodegradation. Electrospray ionisation tandem mass spectrometry (ESI-MS/MS) was utilised to characterise and provide relative quantitative information on the formation of photoproducts localised to specific residues, including the characterisation of low abundance photomodifications not previously reported, including W + 4O modification, hydroxy-bis-tryptophandione and topaquinone. Other photoproducts observed were consistent with the formation of tyrosine-derived dihydroxyphenylalanine (dopa), trihydroxyphenylalanine, dopa-quinone and nitrotyrosine, and tryptophan-derived hydroxytryptophan, dihydroxytryptophan/N-formylkynurenine, kynurenine, hydroxyformylkynurenine, tryptophandiones, tetrahydro-β-carboline and nitrotryptophan. This approach combined product identification and abundance tracking to generate a photodegradation profile of the model system. The profile of products formed yields information on formative mechanisms. Profiling of product formation offers new routes to identify damage markers for use in tracking and controlling oxidative damage to polypeptides.
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Acknowledgements
The present study was supported through a Wool Research Organisation of New Zealand Inc. and New Zealand Wool Industry Charitable Trust Post-Graduate Scholarship.
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Glossary
- ESI-MS
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electrospray ionisation mass spectrometry
- MS/MS
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tandem mass spectrometry
- NFK
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N-formylkynurenine
- ROS
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reactive oxygen species
- RNS
-
reactive nitrogen species
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Grosvenor, A.J., Morton, J.D. & Dyer, J.M. Profiling of residue-level photo-oxidative damage in peptides. Amino Acids 39, 285–296 (2010). https://doi.org/10.1007/s00726-009-0440-7
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DOI: https://doi.org/10.1007/s00726-009-0440-7