title: Calcium ion influx during sporulation in the yeast Saccharomyces cerevisiae.
abstract: The changes in intra- and (or) extra-cellular concentrations of Ca2+, Mg2+, K+, and Na+ during sporulation of a MATa/MAT alpha diploid yeast of Saccharomyces cerevisiae were examined in a nutrition-deprived medium with potassium acetate. Among these, Ca2+ in external medium was preferentially incorporated into cells, and sporulation was induced when the magnitude of free Ca2+ gradient between cytosol [Ca2+]i and external medium [Ca2+]o reached more than 3 x 10(3) ([Ca2+]i/[Ca2+]o = 3.5 x 10(3)). The result indicated that the meiosis and (or) sporulation signal of the yeast S. cerevisiae was generated through elevated Ca2+ influx rather than release from the internal Ca2+ stores.
mesh_terms: D001692:Biological Transport; D002118:Calcium / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000378:metabolism* / Q000502:physiology*; D015398:Signal Transduction / Q000502:physiology*; D013172:Spores, Fungal / Q000502:physiology
chemical_list: D002118:Calcium