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J Cell Biol. 2015 May 25;209(4):507-17. doi: 10.1083/jcb.201412035. Epub 2015 May 18.

Kinetochore-localized BUB-1/BUB-3 complex promotes anaphase onset in C. elegans.

Author information

1
Ludwig Cancer Research and Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92037 Ludwig Cancer Research and Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92037.
2
Ludwig Cancer Research and Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92037 Ludwig Cancer Research and Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92037 abdesai@ucsd.edu.

Abstract

The conserved Bub1/Bub3 complex is recruited to the kinetochore region of mitotic chromosomes, where it initiates spindle checkpoint signaling and promotes chromosome alignment. Here we show that, in contrast to the expectation for a checkpoint pathway component, the BUB-1/BUB-3 complex promotes timely anaphase onset in Caenorhabditis elegans embryos. This activity of BUB-1/BUB-3 was independent of spindle checkpoint signaling but required kinetochore localization. BUB-1/BUB-3 inhibition equivalently delayed separase activation and other events occurring during mitotic exit. The anaphase promotion function required BUB-1's kinase domain, but not its kinase activity, and this function was independent of the role of BUB-1/BUB-3 in chromosome alignment. These results reveal an unexpected role for the BUB-1/BUB-3 complex in promoting anaphase onset that is distinct from its well-studied functions in checkpoint signaling and chromosome alignment, and suggest a new mechanism contributing to the coordination of the metaphase-to-anaphase transition.

PMID:
25987605
PMCID:
PMC4442812
DOI:
10.1083/jcb.201412035
[Indexed for MEDLINE]
Free PMC Article

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