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Regulation of protein synthesis factor EF-1 alpha in Mucor racemosus
Abstract:
The protein synthesis elongation factor EF-1 alpha of Mucor racemosus hyphae contained eight or nine methylated amino acids per molecule, whereas the factor from sporangiospores was nonmethylated. During the course of spore germination, the specific activity of the factor in crude extracts increased sixfold. This increase in activity was accompanied by a constant level of EF-1 alpha-specific mRNA and a constant level of EF-1 alpha protein. Methylation of the protein, however, accelerated during the germination process, in parallel with the increase in specific activity of the factor. We propose that the activity of EF-1 alpha is regulated during germination through methylation of the protein and does not involve transcriptional regulation.
Insights
Protein methylation regulates the activity of elongation factor EF-1 alpha during Mucor racemosus spore germination. This process enhances protein synthesis without altering gene expression or protein levels.
Area of Science:
- Molecular biology
- Biochemistry
- Mycology
Background:
- Protein synthesis elongation factor EF-1 alpha plays a crucial role in cellular processes.
- Differential methylation of EF-1 alpha has been observed between hyphae and sporangiospores in Mucor racemosus.
Purpose of the Study:
- To investigate the role of protein methylation in regulating the activity of EF-1 alpha during Mucor racemosus spore germination.
- To determine if transcriptional regulation or post-translational modification controls EF-1 alpha activity.
Main Methods:
- Comparative analysis of EF-1 alpha methylation in hyphae and sporangiospores.
- Assay of EF-1 alpha specific activity in crude extracts during spore germination.
- Quantification of EF-1 alpha-specific mRNA and protein levels during germination.
Main Results:
- EF-1 alpha from Mucor racemosus hyphae was methylated, while the factor from sporangiospores was not.
- Specific activity of EF-1 alpha increased sixfold during spore germination.
- Methylation of EF-1 alpha accelerated during germination, correlating with increased specific activity.
- EF-1 alpha-specific mRNA and protein levels remained constant throughout germination.
Conclusions:
- Protein methylation, not transcriptional regulation, is proposed as the mechanism controlling EF-1 alpha activity during Mucor racemosus spore germination.
- Post-translational modification of EF-1 alpha is a key regulatory event in fungal development.