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Mass spectral analysis of the previously unknown product generated by HST2-catalyzed histone/protein deacetylation. MALDI mass spectrometry was used to identity a mass of 602 m/z, consistent with the formation of acetyl-ADP- ribose (1-O-acetyl-ADP-ribose). For comparison, authentic ADP-ribose yielded a predicted mass of 560 m/z. With both ADP-ribose and acetyl-ADP-ribose, masses corresponding to the association of one and two sodium ions also were observed.
