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Physiological control of phosphorylation ribosomal protein S6 in Mucor racemosus
Abstract:
The level of phosphorylation of ribosomal protein S6 increased with accelerating rates of growth and protein synthesis in Mucor racemosus. Lowered levels of phosphorylation were seen under conditions of metabolic shift-down or the onset of stationary phase, and no phosphorylation was detected in sporangiospores. Changing metabolic states, changing intracellular levels of adenosine triphosphatase, and the level of phosphorylation of protein S6 were correlated in M. racemosus.
Insights
Phosphorylation of ribosomal protein S6 in Mucor racemosus correlates with growth and metabolic state. Levels rise with growth and protein synthesis, decreasing during metabolic slowdown and absent in spores.
Area of Science:
- Molecular biology
- Mycology
- Biochemistry
Background:
- Ribosomal protein S6 phosphorylation is a key regulator of protein synthesis.
- Mucor racemosus is a fungus with dynamic growth and metabolic states.
Purpose of the Study:
- To investigate the correlation between ribosomal protein S6 phosphorylation and metabolic states in Mucor racemosus.
- To understand the role of S6 phosphorylation in regulating growth and protein synthesis in this fungus.
Main Methods:
- Culturing Mucor racemosus under various growth conditions.
- Measuring the level of ribosomal protein S6 phosphorylation.
- Monitoring intracellular adenosine triphosphatase levels.
Main Results:
- S6 protein phosphorylation levels increased with accelerated growth and protein synthesis rates.
- Phosphorylation decreased during metabolic shift-down and stationary phase.
- No S6 phosphorylation was detected in sporangiospores.
- S6 phosphorylation correlated with intracellular adenosine triphosphatase levels and metabolic state.
Conclusions:
- Ribosomal protein S6 phosphorylation is a sensitive indicator of metabolic state and growth rate in Mucor racemosus.
- These findings highlight the regulatory role of S6 phosphorylation in fungal growth and protein synthesis.