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Molecular and Cellular Biology, December 2000, p. 8709-8719, Vol. 20, No. 23
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

In Vivo Requirement of Activator-Specific Binding Targets of Mediator

Jin Mo Park, Hye-Suk Kim, Sang Jun Han, Moon-Sun Hwang, Young Chul Lee, and Young-Joon Kim*

Genome Regulation Center, Creative Research Initiative, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Korea

Received 17 July 2000/Returned for modification 17 August 2000/Accepted 24 August 2000

There has been no unequivocal demonstration that the activator binding targets identified in vitro play a key role in transcriptional activation in vivo. To examine whether activator-Mediator interactions are required for gene transcription under physiological conditions, we performed functional analyses with Mediator components that interact specifically with natural yeast activators. Different activators interact with Mediator via distinct binding targets. Deletion of a distinct activator binding region of Mediator completely compromised gene activation in vivo by some, but not all, transcriptional activators. These demonstrate that the activator-specific targets in Mediator are essential for transcriptional activation in living cells, but their requirement was affected by the nature of the activator-DNA interaction and the existence of a postrecruitment activation process.

* Corresponding author. Mailing address: Sungkyunkwan University School of Medicine, Chunchun-dong 300, Jangan-ku, Suwon-si, Kyunggi-do 440-746, Korea. Phone: 82-31-299-6439. Fax: 82-31-299-6435. E-mail: yjkim{at}medical.skku.ac.kr.

Molecular and Cellular Biology, December 2000, p. 8709-8719, Vol. 20, No. 23
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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