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Polyamine-sensitive magnesium transport in Saccharomyces cerevisiae
T Maruyama1, N Masuda, Y Kakinuma
1Faculty of Pharmaceutical Sciences, Chiba University, Japan.
Biochimica Et Biophysica Acta
|September 14, 1994
Summary
Polyamines like spermine inhibit yeast growth by interfering with magnesium (Mg2+) uptake. This competition suggests a crucial role for Mg2+ transport in yeast physiology.
Area of Science:
- Cellular Physiology
- Biochemistry
- Microbiology
Background:
- Polyamines are essential metabolites for cell proliferation.
- Yeast growth is highly dependent on magnesium (Mg2+) availability.
- Previous studies have not fully elucidated the interaction between polyamines and Mg2+ transport.
Purpose of the Study:
- To investigate the toxic effects of polyamines on Saccharomyces cerevisiae growth.
- To determine the impact of polyamines on intracellular Mg2+ content and uptake.
- To explore the competitive interaction between polyamines and Mg2+ for cellular accumulation.
Main Methods:
- Yeast growth assays in magnesium-limited and high-Mg2+ media.
- Measurement of intracellular Mg2+ and polyamine content.
- Analysis of energy-dependent Mg2+ and polyamine uptake kinetics.
Main Results:
- Polyamines (spermine, spermidine, putrescine) inhibited yeast growth in Mg2+-limited conditions.
- Spermine addition decreased intracellular Mg2+ and increased intracellular spermine, suggesting substitution.
- Polyamines inhibited energy-dependent Mg2+ uptake, while Mg2+ inhibited polyamine uptake, indicating competition.
Conclusions:
- A polyamine-sensitive Mg2+ transport system is vital for yeast physiology.
- Competition between extracellular polyamines and Mg2+ for cellular uptake affects growth.
- Understanding this interaction is key to comprehending cellular homeostasis.