Composition for inhibiting transcription comprising p300 histone acetylase inhibitor and method for screening for inhibitor capable of inhibiting p300 histone acetylase inhibitor

摘要

An inhibitor of histone acetyltransferase p300 was isolated from human cDNA library and identified as a nuclear protein composed of 855 amino acid residues. It binds to the cysteine/histidine-rich region of p300, thereby inhibiting the transcriptional activation by p300. It also inhibits the transcription activity of p53, with p300 functioning as a coactivator, and inhibits the discontinuance of cell cycle that relies on p53.