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Expression, Solubilization, and Purification of Eukaryotic Borate Transporters
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Water Transport in Yeasts.

Farzana Sabir1,2, Catarina Prista3, Ana Madeira4

  • 1LEAF, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisbon, Portugal. fsabir@isa.ulisboa.pt.

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Yeast aquaporins, crucial water channels, regulate water movement across cell membranes. This review covers their structure, function, and roles in yeast physiology, including osmo-sensitivity and freeze-thaw tolerance.

Keywords:
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Area of Science:

  • Biochemistry and Molecular Biology
  • Cell Biology
  • Microbiology

Background:

  • Water transport in cells occurs via the lipid bilayer and regulated aquaporins.
  • Aquaporins, part of the MIP superfamily, are classified into orthodox (water-specific) and heterodox (aquaglyceroporins) subfamilies.
  • The yeast Saccharomyces cerevisiae possesses four aquaporin isoforms: ScAqy1, ScAqy2 (orthodox), and ScFps1, ScAqy3 (aquaglyceroporins).

Purpose of the Study:

  • To review advances in aquaporin structure, focusing on selectivity, conductance, and gating mechanisms.
  • To highlight the physiological importance of aquaporins in yeast.
  • To discuss the involvement of aquaporins in key yeast processes.

Main Methods:

  • Literature review of aquaporin structure and function.
  • Analysis of aquaporin classification and subfamily representation in yeast.
  • Examination of the roles of specific yeast aquaporins in cellular processes.

Main Results:

  • Structural insights into aquaporin selectivity, conductance, and gating are advancing.
  • Four aquaporin isoforms (ScAqy1, ScAqy2, ScFps1, ScAqy3) identified in Saccharomyces cerevisiae.
  • Aquaporins are implicated in yeast sporulation, freeze-thaw tolerance, osmo-sensitivity, and colony morphology.

Conclusions:

  • Aquaporins play vital roles in yeast physiology, influencing critical survival and growth mechanisms.
  • Understanding aquaporin structure-function relationships is key to elucidating their physiological impact.
  • Further research is needed to fully understand the precise mechanisms by which aquaporins affect yeast cell properties.