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Eukaryotic Cell, December 2004, p. 1544-1556, Vol. 3, No. 6
1535-9778/04/$08.00+0     DOI: 10.1128/EC.3.6.1544-1556.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Role for the Ran Binding Protein, Mog1p, in Saccharomyces cerevisiae SLN1-SKN7 Signal Transduction

Jade Mei-Yeh Lu,1 Robert J. Deschenes,2 and Jan S. Fassler1*

Department of Biological Sciences,1 Department of Biochemistry, University of Iowa, Iowa City, Iowa2

Received 26 June 2004/ Accepted 21 September 2004

Yeast Sln1p is an osmotic stress sensor with histidine kinase activity. Modulation of Sln1 kinase activity in response to changes in the osmotic environment regulates the activity of the osmotic response mitogen-activated protein kinase pathway and the activity of the Skn7p transcription factor, both important for adaptation to changing osmotic stress conditions. Many aspects of Sln1 function, such as how kinase activity is regulated to allow a rapid response to the continually changing osmotic environment, are not understood. To gain insight into Sln1p function, we conducted a two-hybrid screen to identify interactors. Mog1p, a protein that interacts with the yeast Ran1 homolog, Gsp1p, was identified in this screen. The interaction with Mog1p was characterized in vitro, and its importance was assessed in vivo. mog1 mutants exhibit defects in SLN1-SKN7 signal transduction and mislocalization of the Skn7p transcription factor. The requirement for Mog1p in normal localization of Skn7p to the nucleus does not fully account for the mog1-related defects in SLN1-SKN7 signal transduction, raising the possibility that Mog1p may play a role in Skn7 binding and activation of osmotic response genes.

* Corresponding author. Mailing address: Department of Biological Sciences, University of Iowa, 202 BBE, Iowa City, IA 52242. Phone: (319) 335-1542. Fax: (319) 335-1069. E-mail: jan-fassler{at}uiowa.edu.

Eukaryotic Cell, December 2004, p. 1544-1556, Vol. 3, No. 6
1535-9778/04/$08.00+0     DOI: 10.1128/EC.3.6.1544-1556.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Wu, L., Yong, S. L., Fan, C., Ni, Y., Yoo, S., Zhang, T., Zhang, X., Obejero-Paz, C. A., Rho, H.-J., Ke, T., Szafranski, P., Jones, S. W., Chen, Q., Wang, Q. K. (2008). Identification of a New Co-factor, MOG1, Required for the Full Function of Cardiac Sodium Channel Nav1.5. J. Biol. Chem. 283: 6968-6978 [Abstract] [Full Text]  
  • Kelley, J. B., Paschal, B. M. (2007). Hyperosmotic Stress Signaling to the Nucleus Disrupts the Ran Gradient and the Production of RanGTP. Mol. Biol. Cell 18: 4365-4376 [Abstract] [Full Text]  


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