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Genetics, Vol. 148, 571-580, February 1998, Copyright © 1998, Genetics Society of America

Dhh1p, a Putative RNA Helicase, Associates with the General Transcription Factors Pop2p and Ccr4p from Saccharomyces cerevisiae

Hiroaki Hataa, Hisayuki Mitsuia, Hong Liua, Yongli Baia, Clyde L. Denisa, Yuki Shimizua, and Akira Sakaia
a Cellular Signaling Group, Mitsubishi Kasei Institute of Life Sciences, Tokyo 194, Japan

Corresponding author: Akira Sakai, Cellular Signaling Group, Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machida-shi, Tokyo 194, Japan, sakai{at}libra.ls.m-kagaku.co.jp (E-mail).

Communicating editor: M. JOHNSTON

The POP2 (Caf1) protein in Saccharomyces cerevisiae affects a variety of transcriptional processes and is a component of the Ccr4p complex. We have isolated five multicopy suppressor genes of a pop2 deletion mutation: CCR4, DHH1 (a putative RNA helicase), PKC1, STM1, and MPT5 (multicopy suppressor of pop two). Overexpression of either the CCR4 or DHH1 genes effectively suppressed phenotypes associated with pop2 mutant cells; overexpression of PKC1, STM1, or MPT5 genes produced only partial suppression. Disruption of the CCR4 or DHH1 genes resulted in phenotypes similar to those observed for pop2 cells. In addition, overexpression of the DHH1 gene also suppressed the ccr4 mutation, suggesting a close relationship between the POP2, CCR4, and DHH1 genes. Two-hybrid analysis and coimmunoprecipitation experiments revealed that Pop2p and Dhh1p interact physically, and these and other data suggest that Dhh1p is also a component of the Ccr4p complex. Finally, we investigated the genetic interaction between factors associated with POP2 and the PKC1 pathway. The temperature-sensitive growth defect of dhh1 or mpt5 cells was suppressed by overexpression of PKC1, and the defect of mpk1 cells was suppressed by overexpression of MPT5. These results and phenotypic analysis of double mutants from the POP2 and PKC1 pathways suggested that the POP2 and the PKC1 pathways are independent but have some overlapping functions.




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