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© The Rockefeller University Press, 0021-9525/1998//1393 $5.00
The Journal of Cell Biology, Volume 141, Number 6, , 1998 1393-1406

Articles

Mammalian p55CDC Mediates Association of the Spindle Checkpoint Protein Mad2 with the Cyclosome/Anaphase-promoting Complex, and is Involved in Regulating Anaphase Onset and Late Mitotic Events



Marko Kallio*, Jasminder Weinstein{ddagger}, John R. Daum*, Daniel J. Burke§, and Gary J. Gorbsky*

* Department of Cell Biology, Health Sciences Center, University of Virginia, Charlottesville, Virginia 22908; {ddagger} Amgen, Inc., Thousand Oaks, California 91320; and § Department of Biology, Gilmer Hall, University of Virginia, Charlottesville, Virginia 22901

We have investigated the function of p55CDC, a mammalian protein related to Cdc20 and Hct1/Cdh1 in Saccharomyces cerevisiae, and Fizzy and Fizzy-related in Drosophila. Immunofluorescence studies and expression of a p55CDC-GFP chimera demonstrate that p55CDC is concentrated at the kinetochores in M phase cells from late prophase to telophase. Some p55CDC is also associated with the spindle microtubules and spindle poles, and some is diffuse in the cytoplasm. At anaphase, the concentration of p55CDC at the kinetochores gradually diminishes, and is gone by late telophase. In extracts prepared from M phase, but not from interphase HeLa cells, p55CDC coimmunoprecipitates with three important elements of the M phase checkpoint machinery: Cdc27, Cdc16, and Mad2. p55CDC is required for binding Mad2 with the Cdc27 and Cdc16. Thus, it is likely that p55CDC mediates the association of Mad2 with the cyclosome/anaphase-promoting complex. Microinjection of anti-p55CDC antibody into mitotic mammalian cells induces arrest or delay at metaphase, and impairs progression of late mitotic events. These studies suggest that mammalian p55CDC may be part of a regulatory and targeting complex for the anaphase-promoting complex.

Abbreviations used in this paper: APC, anaphase-promoting complex; Ase, anaphase spindle elongation; NEB, nuclear envelope breakdown; Pds1, precocious division of sister chromatids.

Address all correspondence to Gary J. Gorbsky, Department of Cell Biology, Health Sciences Center, Box 439, University of Virginia, Charlottesville, VA 22908. Tel.: 804-982-1654. Fax: 804-982-3912; E-mail: gjg5y{at}Virginia.edu


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