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Significance Protein lysine methyl transferases and demethylases, previously identified for histone modification, now are known to modify several nonhistone proteins as well. Their deregulation leads to the development and progression of various diseases, including cancer. Thus these enzymes now stand out as attractive therapeutic targets. We present a detailed study of STAT3 posttranslational modification at K49 by the histone methyl transferase, enhancer of zeste homolog 2 (EZH2). Dimethylation of K49 modulates IL-6–responsive transcription, revealing a previously unrecognized important functional modification of STAT3 activity. Because STAT3 is a major oncogene, and EZH2 function is modified in many cancers, this functional connection between the two raises the possibility that modulation of EZH2 activity might be useful in inhibiting the oncogenic activity of STAT3.

STAT3-driven transcription depends upon the dimethylation of K49 by EZH2