The mitosis-to-interphase transition is coordinated by cross talk between the SIN and MOR pathways in Schizosaccharomyces pombe |
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| Authors: | Samriddha Ray Kazunori Kume Sneha Gupta Wanzhong Ge Mohan Balasubramanian Dai Hirata Dannel McCollum |
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| Affiliation: | 1.Molecular Genetics and Microbiology, University of Massachusetts Medical School, Worcester, MA 01605;2.Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi Hiroshima 739-8530, Japan;3.Temasek Life Sciences Laboratory, Department of Biological Sciences and Mechanobiology Institute, The National University of Singapore, 117604 Singapore |
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| Abstract: | The mechanisms that regulate cytoskeletal remodeling during the transition between mitosis and interphase are poorly understood. In fission yeast the MOR pathway promotes actin polarization to cell tips in interphase, whereas the SIN signaling pathway drives actomyosin ring assembly and cytokinesis. We show that the SIN inhibits MOR signaling in mitosis by interfering with Nak1 kinase-mediated activation of the most downstream MOR component, the NDR family kinase Orb6. Inactivation of the MOR may be a key function of the SIN because attenuation of MOR signaling rescued the cytokinetic defects of SIN mutants and allowed weak SIN signaling to trigger ectopic cytokinesis. Furthermore, failure to inhibit the MOR is toxic when the cell division apparatus is compromised. Together, our results reveal a mutually antagonistic relationship between the SIN and MOR pathways, which is important for completion of cytokinesis and coordination of cytoskeletal remodeling at the mitosis-to-interphase transition. |
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