Sharing the wealth: peroxisome inheritance in budding yeast.
Eukaryotic cells have evolved molecular mechanisms to ensure the faithful partitioning of cellular components during cell division. The budding yeast Saccharomyces cerevisiae has to actively deliver about half of its organelles to the growing bud, while retaining the remaining organelles in the mother cell. Until lately, little was known about the inheritance of peroxisomes. Recent studies have identified the peroxisomal proteins Inp1p and Inp2p as two key regulators of peroxisome inheritance that perform antagonistic functions. Inp1p is required for the retention of peroxisomes in mother cells, whereas Inp2p promotes the bud-directed movement of these organelles. Inp1p anchors peroxisomes to the cell cortex by interacting with specific structures lining the cell periphery. On the other hand, Inp2p functions as the peroxisome-specific receptor for the class V myosin, Myo2p, thereby linking peroxisomes to the translocation machinery that propels peroxisome movement. Tight coordination between Inp1p and Inp2p ensures a fair and harmonious spatial segregation of peroxisomes upon cell division.
Fagarasanu
Monica
M
Department of Cell Biology, University of Alberta, Medical Sciences Building 5-14, Edmonton, Alberta, Canada T6G 2H7.
Fagarasanu
Andrei
A
Rachubinski
Richard A
RA
D008565:Membrane Proteins / Q000378:metabolism*; D018995:Myosin Heavy Chains / Q000378:metabolism; D024701:Myosin Type V / Q000378:metabolism; D020675:Peroxisomes / Q000378:metabolism*; D021381:Protein Transport; D018160:Receptors, Cytoplasmic and Nuclear; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*
C502615:INP1 protein, S cerevisiae; C510742:INP2 protein, S cerevisiae; C077512:MYO2 protein, S cerevisiae; D008565:Membrane Proteins; D018160:Receptors, Cytoplasmic and Nuclear; D029701:Saccharomyces cerevisiae Proteins; D024701:Myosin Type V; D018995:Myosin Heavy Chains