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ACT1-CUP1 Assays Determine the Substrate-Specific Sensitivities of Spliceosomal Mutants in Budding Yeast
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The tightly regulated copper window in yeast.

Seraphine V Wegner1, Fei Sun, Nick Hernandez

  • 1Department of Chemistry, University of Chicago, Chicago, IL 60637, USA.

Chemical Communications (Cambridge, England)
|December 25, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed fluorescent probes from yeast copper regulators Ace1 and Mac1 to measure copper levels. These tools reveal that yeast tightly controls free copper(I) within a narrow concentration range.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Yeast Genetics

Background:

  • Copper is an essential trace element for yeast, playing vital roles in enzyme function and cellular processes.
  • Dysregulation of copper homeostasis can lead to cellular toxicity or deficiency.
  • Understanding intracellular copper dynamics is crucial for comprehending yeast physiology and disease.

Purpose of the Study:

  • To develop novel fluorescent probes for sensitive detection of copper(I) ions in living yeast cells.
  • To investigate the intracellular concentration dynamics of free copper(I) in yeast.
  • To characterize the binding affinities of yeast copper regulators and storage proteins for copper(I).

Main Methods:

  • Genetic engineering of yeast copper regulators (Ace1 and Mac1) into Förster Resonance Energy Transfer (FRET) based fluorescent probes (Ace1-FRET and Mac1-FRET).
  • Utilizing the developed FRET probes to monitor intracellular copper(I) levels.
  • Quantifying copper(I) binding using binding curves for Ace1-FRET, Mac1-FRET, and known copper-binding proteins (Cup1 and Crs5).

Main Results:

  • Ace1-FRET and Mac1-FRET probes demonstrated selective and sensitive responses to copper(I).
  • Binding curves revealed the interaction of copper(I) with regulators and storage proteins.
  • Analysis indicated that free copper(I) is maintained within a narrow concentration window in yeast.

Conclusions:

  • Fluorescent probes Ace1-FRET and Mac1-FRET are effective tools for real-time monitoring of intracellular copper(I).
  • Yeast actively maintains intracellular copper(I) homeostasis within a tightly regulated, narrow concentration range.
  • These findings provide new insights into copper metabolism and regulation in yeast.