Cited by 45Ion Channels and ReceptorsIon channel regulation and functionCalcium signaling and nucleotide metabolism

Subcellular localization and oligomeric structure of the yeast putative stretch-activated Ca2+ channel component Mid1

Yoshimura, Hitoshi, Tada, Tomoko, Iida, Hidetoshi·2004·Experimental Cell Research

Abstract

The yeast Mid1 protein with an apparent molecular mass of 100 kDa is required for Ca2+ influx stimulated by the mating pheromone and by a capacitative calcium entrylike mechanism acting in response to Ca2+ depletion from the endoplasmic reticulum (ER) and functions as a stretch-activated Ca2+ -permeable channel when expressed in mammalian cells. Our previous work with protease protection experiments has indicated that Mid1 is present in the plasma membrane. In this study, we examined a possible intracellular localization of this protein by indirect fluorescence microscopy and found that Mid1 is present in the ER membrane as well as the plasma membrane. Intracellular fluorescence images for Mid1 were the same as those for the ER marker protein Sec71 but quite different from those of the Golgi protein Ypt1. The results were confirmed by membrane fractionation using Angiografin density gradient analysis. We also investigated the oligomeric structures and protein levels of Mid1 and found that Mid1 forms a 200-kDa oligomer by disulfide bonding. The protein level and modification of Mid1 in the plasma membrane and the ER membrane were unchanged by the mating pheromone. These findings provide new insight into the function of Mid1 in relation to localization, modification, and activation mechanisms.

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Crossref · 10.1016/j.yexcr.2003.09.020

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Authors
Yoshimura, H., Tada, T., & Iida, H.
Affiliations
Tokyo Gakugei University (JP)
Corresponding author
Iida, Hidetoshi
Venue
Experimental Cell Research
Publisher
Elsevier BV
Published
2004-02
Volume
293
Issue
2
Pages
185-195
ISSN
0014-4827 (ISSN-L)
OpenAlex
W2078785949
Cited by
45
References
55
Citations by year
2026: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 5 · 2013: 3 · 2012: 4
FWCI
1.12
Type
journal article
Language
en
Open access
closed
Locations
  • Experimental Cell Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
Keywords
MID1, stretch-activated calcium channels, subcellular localization, oligomeric structure, disulfide bonds, endoplasmic reticulum membrane, plasma membrane, store-operated calcium entry, mating pheromone, yeast, Saccharomyces cerevisiae, protein modification
MeSH terms
Cell Membrane, Cells, Cultured, Disulfides, Endoplasmic Reticulum, Intracellular Membranes, Membrane Glycoproteins, Pheromones, Polymers, Saccharomyces cerevisiae, Calcium Channels, Calcium Signaling, rab GTP-Binding Proteins, Protein Structure, Quaternary, Saccharomyces cerevisiae Proteins

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