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Published 7 June 2004. doi:10.1083/jcb.200402097
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 165, Number 5, 685-695
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Article

Myosin-II reorganization during mitosis is controlled temporally by its dephosphorylation and spatially by Mid1 in fission yeast



Fumio Motegi1,2, Mithilesh Mishra3, Mohan K. Balasubramanian3, and Issei Mabuchi1

1 Division of Biology, Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Tokyo, 153-8902, Japan
2 Center for Developmental Biology, RIKEN, Kobe, 650-0047, Japan
3 Temasek Life Sciences Laboratory, The National University of Singapore, 117604, Singapore

Address correspondence to Issei Mabuchi, Division of Biology, Graduate School of Arts and Science, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan. Tel.: 81-3-5454-6630. Fax: 81-3-5454-4318. email: mabuchi{at}ims.u-tokyo.ac.jp

Cytokinesis in many eukaryotes requires an actomyosin contractile ring. Here, we show that in fission yeast the myosin-II heavy chain Myo2 initially accumulates at the division site via its COOH-terminal 134 amino acids independently of F-actin. The COOH-terminal region can access to the division site at early G2, whereas intact Myo2 does so at early mitosis. Ser1444 in the Myo2 COOH-terminal region is a phosphorylation site that is dephosphorylated during early mitosis. Myo2 S1444A prematurely accumulates at the future division site and promotes formation of an F-actin ring even during interphase. The accumulation of Myo2 requires the anillin homologue Mid1 that functions in proper ring placement. Myo2 interacts with Mid1 in cell lysates, and this interaction is inhibited by an S1444D mutation in Myo2. Our results suggest that dephosphorylation of Myo2 liberates the COOH-terminal region from an intramolecular inhibition. Subsequently, dephosphorylated Myo2 is anchored by Mid1 at the medial cortex and promotes the ring assembly in cooperation with F-actin.

Key Words: myosin; actin; phosphorylation; cytokinesis; contractile ring

Abbreviations used in this paper: CR, contractile ring; NETO, new end take off.


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