E3 SUMO-protein ligase PIAS4 is one of severalprotein inhibitor of activated STAT (PIAS) proteins. It is also known as aprotein inhibitor of activated STAT protein gamma (PIASg or PIASy), and is anenzyme that in humans is encoded by thePIAS4gene.[5][6]
PIAS4 has been shown tointeract withMothers against decapentaplegic homolog 6,[7]Mothers against decapentaplegic homolog 7[7] andLymphoid enhancer-binding factor 1.[8] PIAS4 has been shown to be responsible for the SUMOylation of inhibitedWerner syndrome helicase (WRN) trapped on DNA in microsatellite unstable cancer cells.[9]
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