Abstract:
:Passenger proteins migrate from inner centromeres to the spindle midzone during late mitosis, and those described to date are essential both for proper chromosome segregation and for completion of cell cleavage. We have purified and cloned the human passenger protein TD-60, and we here report that it is a member of the RCC1 family and that it binds preferentially the nucleotide-free form of the small G protein Rac1. Using siRNA, we further demonstrate that the absence of TD-60 substantially suppresses overall spindle assembly, blocks cells in prometaphase, and activates the spindle assembly checkpoint. These defects suggest TD-60 may have a role in global spindle assembly or may be specifically required to integrate kinetochores into the mitotic spindle. The latter is consistent with a TD-60 requirement for recruitment of the passenger proteins survivin and Aurora B, and suggests that like other passenger proteins, TD-60 is involved in regulation of cell cleavage.
journal_name
Dev Celljournal_title
Developmental cellauthors
Mollinari C,Reynaud C,Martineau-Thuillier S,Monier S,Kieffer S,Garin J,Andreassen PR,Boulet A,Goud B,Kleman JP,Margolis RLdoi
10.1016/s1534-5807(03)00205-3keywords:
subject
Has Abstractpub_date
2003-08-01 00:00:00pages
295-307issue
2eissn
1534-5807issn
1878-1551pii
S1534-5807(03)00205-3journal_volume
5pub_type
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