In animal cell cytokinesis interaction of non-muscle Myosin II (NMII) with F-actin provides the dominant force for pinching the mother cell into two daughters. Here we demonstrate that celibe (cbe) is a missense allele of zipper, which encodes the Drosophila Myosin heavy chain. cbe mutation impairs binding of Zipper protein to the regulatory light chain Spaghetti Squash (Sqh). In dividing spermatocytes from cbe males, Sqh fails to concentrate at the equatorial cortex, resulting in thin actomyosin rings that are unable to constrict. We show that cbe mutation impairs localization of the Phosphatidylinositol 4-phosphate [PI(4)P] binding protein Golgi phosphoprotein 3 (GOLPH3) and maintenance of centralspindlin at the cell equator of telophase cells. Our results further demonstrate that GOLPH3 protein associates with Sqh and directly binds the centralspindlin subunit Pavarotti. We propose that during cytokinesis the reciprocal dependence between Myosin and PI(4)P-GOLPH3 regulates centralspindlin stabilization at the invaginating plasma membrane and contractile ring assembly.
A novel coordinated function of Myosin II with GOLPH3 controls centralspindlin localization during cytokinesis
These authors contributed equally to this work.
Currently Viewing Accepted Manuscript - Newer Version Available
Stefano Sechi, Anna Frappaolo, Angela Karimpour-Ghahnavieh, Roberta Fraschini, Maria Grazia Giansanti; A novel coordinated function of Myosin II with GOLPH3 controls centralspindlin localization during cytokinesis. J Cell Sci 2020; jcs.252965. doi: https://doi.org/10.1242/jcs.252965
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