Regulation of Yeast Mg Transporter Activity by Intracellular Magnesium
Author Information
Author(s): Lim Phaik Har, Pisat Nilambari P., Gadhia Nidhi, Pandey Abhinav, Donovan Frank X., Stein Lauren, Salt David E., Eide David J., MacDiarmid Colin W.
Hypothesis
How does intracellular magnesium supply regulate the activity of the Alr1 magnesium transporter in yeast?
Conclusion
The study concludes that Alr1 activity is directly regulated by intracellular magnesium levels, rather than by changes in protein accumulation or gene expression.
Supporting Evidence
- Alr1 activity increased significantly under magnesium-deficient conditions.
- The mnr2 mutation enhanced Alr1 activity, indicating a link between intracellular magnesium levels and transporter function.
- Alr1 protein accumulation was not significantly affected by magnesium supply, suggesting post-translational regulation.
- Previous reports of Mg-regulated ALR1 gene expression were not supported by this study.
Takeaway
Yeast can sense how much magnesium is inside them and adjust how much they take in from their surroundings to keep everything balanced.
Methodology
The study used Ni2+ uptake assays and various yeast strains to measure Alr1 activity under different magnesium conditions.
Limitations
The study did not explore the effects of other potential regulatory mechanisms on Alr1 activity.
Digital Object Identifier (DOI)
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