Myosin-driven peroxisome partitioning inS. cerevisiae
Myosin-driven peroxisome partitioning inS. cerevisiae
In Saccharomyces cerevisiae, the class V myosin motor Myo2p propels the movement of most organelles. We recently identified Inp2p as the peroxisome-specific receptor for Myo2p. In this study, we delineate the region of Myo2p devoted to binding peroxisomes. Using mutants of Myo2p specifically impaired in peroxisome binding, we dissect cell cycle–dependent and peroxisome partitioning–dependent mechanisms of Inp2p regulation. We find that although total Inp2p levels oscillate with the cell cycle, Inp2p levels on individual peroxisomes are controlled by peroxisome inheritance, as Inp2p aberrantly accumulates and decorates all peroxisomes in mother cells when peroxisome partitioning is abolished. We also find that Inp2p is a phosphoprotein whose level of phosphorylation is coupled to the cell cycle irrespective of peroxisome positioning in the cell. Our findings demonstrate that both organelle positioning and cell cycle progression control the levels of organelle-specific receptors for molecular motors to ultimately achieve an equidistribution of compartments between mother and daughter cells.
- University of Michigan–Ann Arbor United States
- University of Alberta Canada
- Institiute for Systems Biology United States
- University of Michigan–Flint United States
- Institute for Systems Biology United States
Models, Molecular, Saccharomyces cerevisiae Proteins, Recombinant Fusion Proteins, Saccharomyces cerevisiae/cytology, Myosin Type V, Receptors, Cytoplasmic and Nuclear, Saccharomyces cerevisiae, Two-Hybrid System Techniques, Peroxisomes, Myosin Heavy Chains/metabolism, Point Mutation, Cell cycle/physiology, Research Articles, Molecular Structure, Myosin Heavy Chains, Peroxisomes/metabolism, Cell Cycle, Membrane Proteins, Saccharomyces cerevisiae Proteins/metabolism, Mitochondria, Protein Structure, Tertiary, Vacuoles, Myosin Type V/metabolism, Protein Processing, Post-Translational
Models, Molecular, Saccharomyces cerevisiae Proteins, Recombinant Fusion Proteins, Saccharomyces cerevisiae/cytology, Myosin Type V, Receptors, Cytoplasmic and Nuclear, Saccharomyces cerevisiae, Two-Hybrid System Techniques, Peroxisomes, Myosin Heavy Chains/metabolism, Point Mutation, Cell cycle/physiology, Research Articles, Molecular Structure, Myosin Heavy Chains, Peroxisomes/metabolism, Cell Cycle, Membrane Proteins, Saccharomyces cerevisiae Proteins/metabolism, Mitochondria, Protein Structure, Tertiary, Vacuoles, Myosin Type V/metabolism, Protein Processing, Post-Translational
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