Extracellular Mg2+ regulates intracellular Mg2+ and its subcellular compartmentation in fission yeast, Schizosaccharomyces pombe
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Effects of extracellular magnesium ions ([Mg2+]o ) on intracellular free Mg2+ ([Mg2+]i ) and its subcellular distribution in single fission yeast cells, Schizosaccharomyces pombe, were studied with digital-imaging microscopy and an Mg2+ fluorescent probe (mag-fura-2). Using 0.44 mM [Mg2+]o , [Mg2+]i in yeast cells was 0.91±0.08 mM. Elevation of [Mg2+]o to 1.97 mM induced rapid (within 5 min) increments in [Mg2+]i (2.18±0.11 mM). Lowering [Mg2+]o to 0.06 mM, however, exerted no significant effects on [Mg2+]i (0.93±0.14 mM), at least for periods of up to 30 min. Irrespective of the [Mg2+]o used, the subcellular distribution of [Mg2+]i remained hetero geneous, i.e. where the sub-plasma membrane region >cytoplasm >nucleus. [Mg2+] in all three subcellular compartments increased significantly, two- to threefold, concomitant with [Mg2+]i when placed in 1.97 mM [Mg2+]o . We conclude that [Mg2+]i in fission yeast is maintained at a physiologic level when [Mg2+]o is low, but intracellular free Mg2+ rapidly rises when [Mg2+]o is elevated. Like most eukaryotic cells, yeast may have a Mg2+ transport system(s) which functions to maintain gradients of Mg2+ from the outside to inside the cell and among its subcellular compartments.
- Extracellular Mg2+ regulates intracellular Mg2+ and its subcellular compartmentation in fission yeast, Schizosaccharomyces pombe
Cellular and Molecular Life Sciences CMLS
Volume 53, Issue 1 , pp 69-72
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- Birkhäuser Verlag
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- Key words. Magnesium; Schizosaccharomyces pombe; mag-fura-2.
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- Author Affiliations
- A1. Department of Physiology, State University of New York, Health Science Center at Brooklyn, Brooklyn (New York 11203, USA), US
- A2. Department of Anatomy and Cell Biology, State University of New York, Health Science Center at Brooklyn, Brooklyn (New York 11203, USA), US
- A3. Department of Microbiology and Immunology, State University of New York, Health Science Center at Brooklyn, Brooklyn (New York 11203, USA), US