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J. Cell Biol.,
Volume 143, Number 3, November 2, 1998 709-717


Department of Biology, Sinsheimer Laboratories, University of California, Santa Cruz, California 95064; and In budding yeast, a protein kinase called
Gin4 is specifically activated during mitosis and functions in a pathway initiated by the Clb2 cyclin to control
bud growth. We have used genetics and biochemistry to
identify additional proteins that function with Gin4 in
this pathway, and both of these approaches have identified members of the septin family. Loss of septin function produces a phenotype that is very similar to the
phenotype caused by loss of Gin4 function, and the septins are required early in mitosis to activate Gin4 kinase
activity. Furthermore, septin mutants display a prolonged mitotic delay at the short spindle stage, consistent with a role for the septins in the control of mitotic events. Members of the septin family bind directly to
Gin4, demonstrating that the functions of Gin4 and the
septins must be closely linked within the cell. These results demonstrate that the septins in budding yeast play
an integral role in the mitosis-specific regulation of the
Gin4 kinase and that they carry out functions early in mitosis.
Center for
Comprehensive Biology, University of Washington, Seattle, Washington 98195-7730
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