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Isolation of mRNAs Associated with Yeast Mitochondria to Study Mechanisms of Localized Translation
Published on: March 14, 2014
The ARG8m Reporter for the Study of Yeast Mitochondrial Translation
Daniel Flores-Mireles1, Yolanda Camacho-Villasana1, Xochitl Pérez-Martínez2
1Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Mexico City, Mexico.
Abstract:
Mitochondrial translation is an intricate process involving both general and mRNA-specific factors. In addition, in the yeast Saccharomyces cerevisiae, translation of mitochondrial mRNAs is coupled to assembly of nascent polypeptides into the membrane. ARG8m is a reporter gene widely used to study the mechanisms of yeast mitochondrial translation. This reporter is a recodified gene that uses the mitochondrial genetic code and is inserted at the desired locus in the mitochondrial genome. After deletion of the endogenous nuclear gene, this reporter produces Arg8, an enzyme necessary for arginine biosynthesis. Since Arg8 is a soluble protein with no relation to oxidative phosphorylation, it is a reliable reporter to study mitochondrial mRNAs translation and dissect translation form assembly processes. In this chapter, we explain how to insert the ARG8m reporter in the desired spot in the mitochondrial DNA, how to analyze Arg8 synthesis inside mitochondria, and how to follow steady-state levels of the protein. We also explain how to use it to find spontaneous suppressors of translation defects.
Insights
This study introduces the ARG8m reporter system for studying mitochondrial translation in yeast. It allows researchers to track protein synthesis and identify defects in mitochondrial gene expression.
Area of Science:
- Mitochondrial biology
- Molecular genetics
- Yeast genetics
Background:
- Mitochondrial translation is complex, involving specific factors and coupling to membrane protein assembly in yeast.
- The ARG8m reporter system uses a recodified gene within the mitochondrial genome to study these processes.
Purpose of the Study:
- To detail the methodology for inserting and utilizing the ARG8m reporter in yeast mitochondria.
- To enable the analysis of mitochondrial mRNA translation and protein synthesis.
- To facilitate the identification of suppressors for mitochondrial translation defects.
Main Methods:
- Insertion of the ARG8m reporter gene into the yeast mitochondrial genome.
- Analysis of Arg8 enzyme synthesis within mitochondria.
- Monitoring of steady-state Arg8 protein levels.
- Screening for spontaneous suppressors of translation defects.
Main Results:
- The ARG8m system provides a reliable method to study mitochondrial translation independently of oxidative phosphorylation.
- Established protocols for reporter gene insertion, protein analysis, and suppressor screening are presented.
- Demonstrates the utility of ARG8m in dissecting translation from assembly processes.
Conclusions:
- The ARG8m reporter system is a valuable tool for investigating yeast mitochondrial translation mechanisms.
- This reporter facilitates the study of gene expression and the identification of genetic interactions affecting mitochondrial function.
- The described methods offer a robust approach for future research in mitochondrial genetics.
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