Related Experiment Videos
Interaction between the fission yeast nim1/cdr1 protein kinase and a dynamin-related protein
L Pelloquin1, B Ducommun, P Belenguer
1Institut de Pharmacologie et de Biologie Structurale du CNRS, Université Paul Sabatier, Toulouse, France.
Abstract:
The nim1/cdr1 protein kinase is required for an efficient adaptation of cell cycle parameters to changes in nutritional conditions. We have isolated msp1, a new fission yeast member of the dynamin-related large GTPase family, in a two-hybrid screen designed to identify proteins interacting with the nim1 kinase. Msp1 has been shown to be essential for the maintenance of mtDNA and hence for the inheritance of functional mitochondria. We present evidence indicating that niml and mspl proteins physically interact both in vitro and in vivo in fission yeast. These interactions occur through the amino-terminal catalytic domain of nim1 and the carboxy-terminal putative regulatory domain of mspl. These results provide new evidence for the existence of a connection between mitochondrial function and the cell cycle machinery.
Insights
Researchers discovered a new protein, Msp1, that interacts with Nim1 kinase. This interaction links mitochondrial function to cell cycle regulation in fission yeast, impacting adaptation to nutritional changes.
Area of Science:
- Cell Biology
- Molecular Biology
- Mitochondrial Biology
Background:
- The nim1/cdr1 protein kinase regulates cell cycle adaptation to nutritional changes.
- Mitochondrial function is crucial for cellular health and inheritance.
- Dynamin-related GTPases play diverse cellular roles.
Purpose of the Study:
- To identify novel interacting partners of the nim1 kinase.
- To investigate the function of Msp1, a novel dynamin-related GTPase.
- To explore the connection between mitochondrial maintenance and cell cycle control.
Main Methods:
- Yeast two-hybrid screening to identify protein interactions.
- In vitro and in vivo biochemical assays to confirm physical interactions.
- Mitochondrial DNA (mtDNA) analysis to assess mitochondrial inheritance.
Main Results:
- Msp1, a fission yeast dynamin-related GTPase, was identified as a Nim1-interacting protein.
- Msp1 is essential for mitochondrial DNA maintenance and functional mitochondria inheritance.
- Nim1 and Msp1 physically interact via specific domains, confirmed both in vitro and in vivo.
Conclusions:
- Msp1 physically interacts with Nim1 kinase in fission yeast.
- This interaction establishes a novel link between mitochondrial function and the cell cycle machinery.
- The findings suggest a coordinated regulation of cellular processes impacting adaptation to environmental conditions.