Abstract
Eukaryotic gene expression is known as a multistep process of high complexity. Transcription is one of cardinal and tightly regulated phase during gene expression. To provide accurate and precise work of gene regulation apparatus including a plethora of modification of chromatin structure and nucleosome dynamic turnover must be occurred. All transcription steps are under control of large multiprotein coactivator complexes. In this review we discuss an evolutionary conservative SAGA complex, which acetylates and deubiquitinates histones during transcription activation and furthermore is involved in subsequent stages of mRNP biogenesis and export.
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