Saccharomyces cerevisiae cells respond to hypotonic stress (HTS) by a cytosolic calcium rise, either generated by an influx of calcium from extracellular medium, when calcium is available, or by a release from intracellular stores in scarcity of extracellular calcium. Calcium release from intracellular compartments is peculiarly inhibited by external calcium in a calcineurin-independent and Cch1-, but not Mid1-, driven manner. HTS-induced calcium release is also negatively regulated by the ER protein Cls2 and involves a poorly characterized protein, FLC2/YAL053W gene product, previously proposed to be required for FAD transport in the ER, albeit, due to its molecular features, it was also previously classified as an ion transporter. A computational analysis revealed that this gene and its three homologs in S. cerevisiae, together with previously identified Schizosaccharomyces pombe pkd2 and Neurospora crassa calcium-related spray protein, belong to a fungal branch of TRP-like ion transporters related to human mucolipin and polycystin 2 calcium transporters. Moreover, disruption of FLC2 gene confers severe sensitivity to Calcofluor white and hyper-activation of the cell wall integrity MAPK cascade, suggesting a role in cell wall maintenance as previously suggested for the fission yeast homolog. Perturbation in cytosolic resting calcium concentration and hyper-activation of calcineurin in exponentially growing cells suggest a role for this transporter in calcium homeostasis in yeast.
Hypotonic stress-induced calcium signaling in Saccharomyces cerevisiae involves TRP-like transporters on the endoplasmic reticulum membrane / M. Rigamonti, S. Groppi, F. Belotti, R. Ambrosini, G. Filippi, E. Martegani, R. Tisi. - In: CELL CALCIUM. - ISSN 0143-4160. - 57:2(2015), pp. 57-68.
|Titolo:||Hypotonic stress-induced calcium signaling in Saccharomyces cerevisiae involves TRP-like transporters on the endoplasmic reticulum membrane|
|Parole Chiave:||Budding yeast; Mucolipin like calcium channels; Osmotic shock; PKD2 like calcium channels; Polycystin 2 like calcium channels; TRPML; TRPP; Calcineurin; Calcium; Calcium Channels; Calcium-Binding Proteins; Endoplasmic Reticulum; Membrane Glycoproteins; Mitogen-Activated Protein Kinases; Mutation; Osmotic Pressure; Saccharomyces cerevisiae; Saccharomyces cerevisiae Proteins; TRPC Cation Channels; Calcium Signaling; Physiology; Molecular Biology; Cell Biology|
|Settore Scientifico Disciplinare:||Settore BIO/11 - Biologia Molecolare|
|Data di pubblicazione:||2015|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.ceca.2014.12.003|
|Appare nelle tipologie:||01 - Articolo su periodico|
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