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KP1019 comprises a class of ruthenium compounds having promising anticancer activity. Here, we investigated the molecular targets of KP1019 using Saccharomyces cerevisiae as a model organism. Our results revealed that in the absence of the N-terminal tail of histone H3, the growth inhibitory effect of KP1019 was markedly enhanced. Furthermore, H3K56A or rtt109Δ mutants exhibit hypersensitivity for...