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Upstream Activation Sequence : ウィキペディア英語版
Upstream activating sequence
An upstream activating sequence or upstream activation sequence (UAS) is a cis-acting regulatory sequence. It is distinct from the promoter and increases the expression of a neighbouring gene. Due to its essential role in activating transcription, the upstream activating sequence is often considered to be analogous to the function of the enhancer in multicellular eukaryotes. Upstream activation sequences are a crucial part of induction, enhancing the expression of the protein of interest through increased transcriptional activity. The upstream activation sequence is found adjacently upstream to a minimal promoter (TATA box) and serves as a binding site for transactivators. If the transcriptional transactivator does not bind to the UAS in the proper orientation then transcription cannot begin. To further understand the function of an upstream activation sequence, it is beneficial to see its role in the cascade of events that lead to transcription activation. The pathway begins when activators bind to their target at the UAS recruiting a mediator. A TATA-binding protein subunit of a transcription factor then binds to the TATA box, recruiting additional transcription factors. The mediator then recruits RNA polymerase II to the pre-initiation complex. Once initiated, RNA polymerase II is released from the complex and transcription begins.
==Examples==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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