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The two yeast cytochrome c isoforms differentially regulate supercomplex assembly and mitochondrial electron flow.

Alejandra Guerra-Castellano1, Manuel Aneas1, Joaquín Tamargo-Azpilicueta1

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Cytochrome c is key to forming mitochondrial respiratory supercomplexes, enhancing energy production and reducing ROS. This study reveals its role beyond electron transfer in yeast.

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Area of Science:

  • Mitochondrial biology
  • Cellular respiration
  • Biochemistry

Background:

  • Mitochondria are vital for cellular energy, signaling, and homeostasis.
  • Respiratory supercomplexes in the inner mitochondrial membrane enhance electron transfer and reduce reactive oxygen species (ROS).
  • Cytochrome c, a mobile electron carrier, is implicated in supercomplex assembly.

Purpose of the Study:

  • To investigate the role of cytochrome c in modulating mitochondrial respiratory supercomplex assembly.
  • To elucidate how cytochrome c influences supercomplex organization and function in Saccharomyces cerevisiae.

Main Methods:

  • Utilized Blue-native polyacrylamide gel electrophoresis (BN-PAGE) to analyze supercomplex organization.
  • Employed mass spectrometry-based proteomic analysis to identify protein components.
  • Examined yeast strains expressing different cytochrome c isoforms under fermentative and respiratory conditions.

Main Results:

  • Both cytochrome c isoforms were found to contribute to supercomplex assembly.
  • Isoform-2 of cytochrome c significantly enhanced electron transfer efficiency.
  • Reduced levels of reactive oxygen species (ROS) were observed with isoform-2 activity.
  • Demonstrated that cytochrome c acts as a scaffold for assembly factors, promoting higher-order supercomplex formation (e.g., III2IV2).

Conclusions:

  • Cytochrome c plays a critical role in the assembly of mitochondrial respiratory supercomplexes.
  • Beyond its function in electron transfer, cytochrome c regulates supercomplex organization and mitochondrial homeostasis.
  • The findings propose a model where cytochrome c facilitates supercomplex formation by recruiting assembly factors.