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Molecular and General Genetics MGG

, Volume 251, Issue 5, pp 580–590 | Cite as

A putative membrane protein, Pho88p, involved in inorganic phosphate transport inSaccharomyces cerevisiae

  • C. Yompakdee
  • N. Ogawa
  • S. Harashima
  • Y. Oshima
Original Paper
  • 157 Downloads

Abstract

Transcription of a regulatory gene,PHO81, in the phosphatase regulon ofSaccharomyces cerevisiae is repressed by inorganic phosphate (Pi) in the medium via that same regulatory system. The activity of Pho81p, the product ofPHO81, is also inhibited by a high concentration of Pi in the medium. Increased dosage ofPHO86, a gene encoding a putative membrane protein associated with a Pi transporter complex, activates the Pi-inhibited Pho81p produced under the control of theGAL1 promoter. A new gene,PHO88/YBR106w, has now been identified as a multicopy suppressor of the rAPase phenotype of the cells caused by thePi inhibition of Pho81p. Thepho86 disruptant expressed rAPase activity in high-Pi medium, while thepho88 disruptant did not. The Δpho86 Δpho88 double disruption resulted in enhanced synthesis of rAPase under the high-Pi condition and conferred arsenate resistance on the cells than those in single disruptants of these genes. Its hydropathy profile and the results of an analysis of its cellular localization suggested that Pho88p is a membrane protein similar to Pho86p. Both disruption and high dosage ofPHO88 orPHO86 resulted in reduced Pi uptake. These findings suggest that Pho88p is also involved in Pi transport and modulates Pho81p function together with Pho86p.

Key words

Membrane proteins Phosphatase regulation Pho88p Pi transporter Yeast 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • C. Yompakdee
    • 1
  • N. Ogawa
    • 1
  • S. Harashima
    • 1
  • Y. Oshima
    • 1
  1. 1.Department of Biotechnology, Faculty of EngineeringOsaka UniversityOsakaJapan

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