Related Experiment Video
Updated: Jul 7, 2026
08:55
Assessment of Submitochondrial Protein Localization in Budding Yeast Saccharomyces cerevisiae
Published on: July 19, 2021
Proteomics of yeast mitochondria
Jörg Reinders1, Albert Sickmann
1Protein Mass Spectrometry and Functional Proteomics Group, Rudolf-Virchow-Center for Experimental Biomedicine, Julius-Maximilians-University of Würzburg, Germany.
Methods in Molecular Biology (Clifton, N.J.)
|March 5, 2008
Summary
Understanding mitochondrial function requires studying the mitochondrial proteome. This study uses Saccharomyces cerevisiae and combined proteomics techniques to analyze mitochondrial proteins, ensuring data integrity and comprehensive insights.
Area of Science:
- Proteomics
- Mitochondrial Biology
- Cellular Processes
Background:
- Proteins are fundamental to cellular processes.
- Mitochondrial proteome analysis is crucial for understanding mitochondrial function.
- Analyzing complex protein mixtures from organelles like mitochondria demands advanced techniques.
Purpose of the Study:
- To detail the mitochondrial proteome of Saccharomyces cerevisiae.
- To ensure the integrity of data obtained from complex protein mixture analysis.
- To achieve a comprehensive overview of mitochondrial proteins.
Main Methods:
- Utilizing Saccharomyces cerevisiae as a model organism for isolating pure mitochondria.
- Employing a combination of orthogonal proteomics techniques.
- Applying two-dimensional polyacrylamide gel electrophoresis (2D-PAGE), one-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis (1D-SDS-PAGE), nano-liquid chromatography with tandem mass spectrometry (nano-LC-MS/MS), and multidimensional high-performance liquid chromatography with tandem mass spectrometry (HPLC-MS/MS).
Main Results:
- Demonstrated the isolation of highly pure mitochondria in large quantities from Saccharomyces cerevisiae.
- Successfully applied a combination of complementary proteomics methods.
- Overcame limitations of individual techniques through parallel application.
Conclusions:
- Combining orthogonal proteomics techniques provides a more complete and reliable analysis of the mitochondrial proteome.
- This integrated approach enhances data integrity and comprehensiveness in mitochondrial research.
- Saccharomyces cerevisiae serves as an effective model for high-purity mitochondrial proteome studies.
Related Concept Videos
01:19Translocation of Proteins into the Mitochondria
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
01:39Mitochondrial Protein Sorting
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
01:45Mitochondrial Membranes
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
01:45Mitochondrial Membranes
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
01:34Protein Transport into the Inner Mitochondrial Membrane
Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
Transport of mitochondrial precursors across the TIM23 channel is driven by...
01:37Mitochondria
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...