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ADP-ribosylation refers to the addition of one or more ADP-ribose units onto proteins post-translationally. This protein modification is often added by ADP-ribosyltransferases, commonly known as PARPs, but it can also be added by other enzymes, including sirtuins or bacterial toxins.
(Vivelo et al., 2016) ADPriboDB: The Database of ADP-ribosylated Proteins. bioRxiv.