Eukaryotic Cell
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Eukaryotic Cell, December 2006, p. 2120-2127, Vol. 5, No. 12
1535-9778/06/$08.00+0     doi:10.1128/EC.00121-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Identification of Translational Regulation Target Genes during Filamentous Growth in Saccharomyces cerevisiae: Regulatory Role of Caf20 and Dhh1{triangledown}

Young-Un Park, Hyangsuk Hur, Minhan Ka, and Jinmi Kim*

Department of Microbiology, School of Bioscience and Biotechnology, Chungnam National University, Daejeon 305-764, Republic of Korea

Received 21 April 2006/ Accepted 2 October 2006

The dimorphic transition of yeast to the hyphal form is regulated by the mitogen-activated protein kinase and cyclic AMP-dependent protein kinase A pathways in Saccharomyces cerevisiae. Signaling pathway-responsive transcription factors such as Ste12, Tec1, and Flo8 are known to mediate filamentation-specific transcription. We were interested in investigating the translational regulation of specific mRNAs during the yeast-to-hyphal-form transition. Using polyribosome fractionation and RT-PCR analysis, we identified STE12, GPA2, and CLN1 as translation regulation target genes during filamentous growth. The transcript levels for these genes did not change, but their mRNAs were preferentially associated with polyribosomes during the hyphal transition. The intracellular levels of Ste12, Gpa2, and Cln1 proteins increased under hyphal-growth conditions. The increase in Ste12 protein level was partially blocked by mutations in the CAF20 and DHH1 genes, which encode an eIF4E inhibitor and a decapping activator, respectively. In addition, the caf20 and dhh1 mutations resulted in defects in filamentous growth. The filamentation defects caused by caf20 and dhh1 mutations were suppressed by STE12 overexpression. These results suggest that Caf20 and Dhh1 control yeast filamentation by regulating STE12 translation.

* Corresponding author. Mailing address: Department of Microbiology, School of Bioscience and Biotechnology, Chungnam National University, Yuseong-Gu, Gung-Dong 220, Daejeon 305-764, Republic of Korea. Phone: 82-42-821-6416. Fax: 82-42-822-7367. E-mail: jmkim{at}cnu.ac.kr.

{triangledown} Published ahead of print on 13 October 2006.

Eukaryotic Cell, December 2006, p. 2120-2127, Vol. 5, No. 12
1535-9778/06/$08.00+0     doi:10.1128/EC.00121-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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