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Dnm1 forms spirals that are structurally tailored to fit mitochondria
Elena Ingerman1, Edward M Perkins, Michael Marino
1Department of Molecular and Cellular Biology, Center for Genetics and Development, University of California, Davis, Davis, CA 95616, USA.
The Journal of Cell Biology
|September 28, 2005
Summary
Dynamin-related protein 1 (Dnm1) self-assembly drives mitochondrial division by forming spirals that constrict membranes. Its nucleotide hydrolysis and nucleation steps regulate this essential cellular process.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Dynamin-related proteins (DRPs) are crucial GTPases regulating membrane dynamics in cellular processes.
- Dnm1, a yeast DRP, is essential for mitochondrial division, but its precise mechanism remains unclear.
Purpose of the Study:
- To elucidate the mechanism by which Dnm1 mediates mitochondrial division.
- To identify regulatory features governing Dnm1 self-assembly and function.
Main Methods:
- Investigated Dnm1 self-assembly in vitro.
- Analyzed Dnm1's interaction with GTP and its hydrolysis.
- Characterized the structure of assembled Dnm1 using electron microscopy.
Main Results:
- Dnm1 self-assembly drives membrane constriction during mitochondrial division.
- Dnm1 self-assembly involves a rate-limiting nucleation step.
- Nucleotide hydrolysis by assembled Dnm1 is highly cooperative with GTP.
- Assembled Dnm1 forms spirals with diameters matching mitochondrial constriction sites.
Conclusions:
- Dnm1 functions through self-assembly to constrict mitochondrial membranes.
- The structure of Dnm1 assemblies is adapted to the dimensions of mitochondrial division sites.
- Understanding Dnm1 regulation provides insights into mitochondrial dynamics and cellular membrane remodeling.