Student Author(s)

Samriddha Ray; Sneha Gupta

Academic Program

Interdisciplinary Graduate Program

UMMS Affiliation

Department of Molecular Genetics and Microbiology

Publication Date


Document Type



Cell Biology | Cellular and Molecular Physiology


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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DOI of Published Version



Ray S, Kume K, Gupta S, Ge W, alasubramanian M, Hirata D, McCollum D. The mitosis-to-interphase transition is coordinated by cross talk between the SIN and MOR pathways in Schizosaccharomyces pombe. J Cell Biol. 2010 Sep 6;190(5):793-805. doi: 10.1083/jcb.201002055. Link to article on publisher's site

Journal/Book/Conference Title

The Journal of cell biology

Related Resources

Link to Article in PubMed

PubMed ID