Journal
JOURNAL OF PROTEOME RESEARCH
Volume 18, Issue 5, Pages 2270-2278Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jproteome.9b00118
Keywords
posttranslational modification; protein database; citrullination; mass spectrometry
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Funding
- National Institutes of Health (National Institute of Arthritis and Musculoskeletal and Skin Diseases) [R01 AR050026-12A1]
- National Institutes of Health (National Heart, Lung, and Blood Institute) [R01HL111362]
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Protein citrullination (or deimination), an irreversible post-translational modification, has been implicated in several physiological and pathological processes, including gene expression regulation, apoptosis, rheumatoid arthritis, and Alzheimer's disease. Several research studies have been carried out on citrullination under many conditions. However, until now, challenges in sample preparation and data analysis have made it difficult to confidently identify a citrullinated protein and assign the citrullinated site. To overcome these limitations, we generated a mouse hyper-citrullinated spectral library and set up coordinates to confidently identify and validate citrullinated sites. Using this workflow, we detect a four-fold increase in citrullinated proteome coverage across six mouse organs compared with the current state-of-the art techniques. Our data reveal that the subcellular distribution of citrullinated proteins is tissue-type-dependent and that citrullinated targets are involved in fundamental physiological processes, including the metabolic process. These data represent the first report of a hyper-citrullinated library for the mouse and serve as a central resource for exploring the role of citrullination in this organism.
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