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High-resolution Respirometry to Assess Mitochondrial Function in Permeabilized and Intact Cells
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Mitochondrial Respiration Quantification in Yeast Whole Cells.

Gerardo M Nava1, Andres Carrillo-Garmendia1, Juan Carlos González-Hernández2

  • 1School of Chemistry, Universidad Autónoma de Querétaro.

Journal of Visualized Experiments : Jove
|November 25, 2024
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Summary

This study introduces a novel method to measure mitochondrial respiration in intact yeast cells, preserving cellular context. This technique provides valuable insights into how yeast cells adapt their energy metabolism to various conditions.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Metabolic Engineering

Background:

  • Cellular metabolism is regulated by energy levels and environmental factors.
  • Mitochondrial respiration is crucial for ATP synthesis and is typically studied in isolated mitochondria, losing cellular context.
  • Understanding cellular energetic metabolism adaptation is key to elucidating molecular mechanisms.

Purpose of the Study:

  • To develop and present a method for quantifying mitochondrial respiration within intact yeast cells.
  • To maintain the cellular context during mitochondrial respiration measurements.
  • To provide a versatile method applicable to various yeast species, including Saccharomyces cerevisiae.

Main Methods:

  • Yeast cells are cultured under specific conditions and then washed and resuspended.
  • Oxygen consumption is measured using a Clark electrode in an oximeter chamber with intact cells.
  • Sequential addition of oligomycin (ATPase inhibitor), an uncoupler, and electron transport chain inhibitors allows for detailed analysis of respiration.

Main Results:

  • The method quantifies oxygen consumption rate via linear regression analysis of data.
  • It successfully measures respiration coupled to ATP synthesis, maximal respiratory capacity, and non-mitochondrial oxygen consumption.
  • The technique preserves the cellular environment, offering a more physiologically relevant assessment.

Conclusions:

  • This method offers a specific and context-preserving approach to studying yeast mitochondrial respiration.
  • It is adaptable for different yeast species, though specific inhibitors may need adjustment.
  • The technique enhances understanding of cellular energy metabolism adaptation in yeast.