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Merck

Chemical Proteomic Platform To Identify Citrullinated Proteins.

ACS chemical biology (2015-09-12)
Daniel M Lewallen, Kevin L Bicker, Venkataraman Subramanian, Kathleen W Clancy, Daniel J Slade, Julianne Martell, Christina J Dreyton, Jeremy Sokolove, Eranthie Weerapana, Paul R Thompson
要旨

Anti-citrullinated protein antibodies (ACPAs) are a hallmark of rheumatoid arthritis (RA) and are routinely used for disease diagnosis. Protein citrullination is also increased in cancer and other autoimmune disorders, suggesting that citrullinated proteins may serve as biomarkers for diseases beyond RA. To identify these citrullinated proteins, we developed biotin-conjugated phenylglyoxal (biotin-PG). Using this probe and our platform technology, we identified >50 intracellular citrullinated proteins. More than 20 of these are involved in RNA splicing, suggesting, for the first time, that citrullination modulates RNA biology. Overall, this chemical proteomic platform will play a key role in furthering our understanding of protein citrullination in rheumatoid arthritis and potentially a wider spectrum of inflammatory diseases.

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