title: Phosphorylation of CHO1 by Lats1/2 regulates the centrosomal activation of LIMK1 during cytokinesis.
abstract: Large tumor suppressor 1 and 2 (Lats1/2) regulate centrosomal integrity, chromosome segregation and cytokinesis. As components of the centralspindlin complex, the kinesin-like protein CHO1 and its splicing variant MKLP1 colocalize with chromosome passenger proteins and GTPases and regulate the formation of the contractile ring and cytokinesis; however, the regulatory mechanisms of CHO1/MKLP1 remain elusive. Here, we show that Lats1/2 phosphorylate Ser716 in the F-actin-interacting region of CHO1, which is absent in MKLP1. Phosphorylated CHO1 localized to the centrosomes and midbody, and the actin polymerization factor LIM-kinase 1 (LIMK1) was identified as its binding partner. Overexpression of constitutively phosphorylated and non-phosphorylated CHO1 altered the mitotic localization and activation of LIMK1 at the centrosomes in HeLa cells, leading to the inhibition of cytokinesis through excessive phosphorylation of Cofilin and mislocalization of Ect2. These results suggest that Lats1/2 stringently control cytokinesis by regulating CHO1 phosphorylation and the mitotic activation of LIMK1 on centrosomes.
authors.affiliation: a Department of Molecular Genetics ; Research Institute for Microbial Diseases; Osaka University ; Suita City , Osaka , Japan.
authors.forename: Ayumi
authors.initials: A
authors.lastname: Okamoto
authors.forename: Norikazu
authors.initials: N
authors.lastname: Yabuta
authors.forename: Satomi
authors.initials: S
authors.lastname: Mukai
authors.forename: Kosuke
authors.initials: K
authors.lastname: Torigata
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nojima
mesh_terms: D018385:Centrosome / Q000378:metabolism; D051338:Cofilin 1 / Q000378:metabolism; D048749:Cytokinesis / Q000502:physiology*; D057809:HEK293 Cells; D006367:HeLa Cells; D006801:Humans; D054461:Lim Kinases / Q000378:metabolism*; D008856:Microscopy, Fluorescence; D008869:Microtubule-Associated Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D008938:Mitosis; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000378:metabolism; D015398:Signal Transduction; D025521:Tumor Suppressor Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*
chemical_list: D051338:Cofilin 1; C489850:ECT2 protein, human; C092935:KIF23 protein, human; D008869:Microtubule-Associated Proteins; D011518:Proto-Oncogene Proteins; D034741:RNA, Small Interfering; D025521:Tumor Suppressor Proteins; C092745:LATS1 protein, human; C406449:LATS2 protein, human; C515892:LIMK1 protein, human; D054461:Lim Kinases; D017346:Protein Serine-Threonine Kinases
keywords: CHO1; LIMK1; Lats1; centrosome; cytokinesis; phosphorylation