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Related Experiment Video

Updated: Aug 8, 2025

Author Spotlight: Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification
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Protocol for mitochondrial isolation and sub-cellular localization assay for mitochondrial proteins.

Danyi Zhou1, Sheng Zhong1, Xinyu Han1

  • 1Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou 325035, China.

STAR Protocols
|February 28, 2023
PubMed
Summary

This study presents a detailed protocol for isolating mitochondria and extracting mitochondrial proteins from cultured cells. The method effectively separates integral, peripheral, and soluble proteins, aiding in mitochondrial research.

Keywords:
Cell MembraneCell cultureCell separation/fractionationProtein Biochemistry

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Proteomics

Background:

  • Mitochondria are crucial organelles with complex protein compositions.
  • Accurate isolation and fractionation of mitochondrial proteins are essential for understanding mitochondrial function and disease.
  • Existing methods may not efficiently distinguish between different classes of mitochondrial membrane proteins.

Purpose of the Study:

  • To establish a robust protocol for isolating mitochondria from cultured cells.
  • To develop a method for the differential extraction of mitochondrial proteins based on their location (soluble, peripheral membrane, integral membrane).
  • To enable the specific identification of outer mitochondrial membrane proteins.

Main Methods:

  • Mitochondrial isolation from cultured cells.
  • Sonication to separate soluble proteins from membrane fractions.
  • Sodium carbonate extraction to differentiate integral and peripheral membrane proteins.
  • Enzymatic digestion (Proteinase K) and detergent treatment (Triton X-100) for outer membrane protein analysis.

Main Results:

  • Successful isolation of intact mitochondria.
  • Effective separation of soluble, peripheral, and integral membrane proteins.
  • Distinction of outer mitochondrial membrane proteins from other mitochondrial fractions.
  • The protocol provides a reliable means to analyze distinct mitochondrial protein populations.

Conclusions:

  • The presented protocol offers a comprehensive approach for the subcellular fractionation of mitochondrial proteins.
  • This method facilitates in-depth studies of mitochondrial proteomes and their functions.
  • The protocol is valuable for researchers investigating mitochondrial biology and pathology.