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Mechanosensitive channels Msy1 and Msy2 are required for maintaining organelle integrity upon hypoosmotic shock in

Yoshitaka Nakayama1, Aiko Hirata, Hidetoshi Iida

  • 1Department of Biology, Tokyo Gakugei University, Koganei-shi, Tokyo, Japan.

FEMS Yeast Research
|July 22, 2014
PubMed

Insights

Mechanosensitive channels Mys1 and Msy2 in fission yeast are crucial for maintaining cell structure during hypoosmotic shock. Double mutants lacking both channels exhibit severe vacuole and nuclear envelope defects, highlighting their complementary roles.

Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Biology

Background:

  • Mechanosensitive channels regulate cellular responses to mechanical stress.
  • In fission yeast, Mys1 and Msy2 are endoplasmic reticulum-localized channels involved in hypoosmotic shock response.
  • Cytoplasmic calcium levels are critical during osmotic stress.

Purpose of the Study:

  • To investigate the role of Mys1 and Msy2 in maintaining organellar structure under hypoosmotic conditions.
  • To determine the functional relationship between Mys1 and Msy2 in response to osmotic stress.

Main Methods:

  • Transmission electron microscopy was used to examine organellar structures.
  • Fission yeast strains with single and double mutations in Mys1 and Msy2 were subjected to hypoosmotic shock.

Main Results:

  • Single mutants (msy1(-) and msy2(-)) showed swollen vacuoles, similar to wild-type cells.
  • Double mutants (msy1(-) msy2(-)) displayed abnormally large vacuoles and cracks in the nuclear envelope.
  • These defects suggest a critical role for both channels in maintaining cellular integrity.

Conclusions:

  • Mys1 and Msy2 are essential for maintaining vacuole integrity during hypoosmotic shock.
  • These channels play a role in protecting the nuclear envelope from osmotic stress.
  • Msy1 and Msy2 exhibit functional complementarity in responding to hypoosmotic stress.
Keywords:
mechanosensitive channelorganelle integrityosmotic shocktransmission electron microscopy

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