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MBC in Press, published online ahead of print July 25, 2007
Mol. Biol. Cell 10.1091/mbc.E07-03-0201

A more recent version of this article appeared on October 1, 2007
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Submitted on March 2, 2007
Revised on June 26, 2007
Accepted on July 18, 2007

A Bir1p-Sli15p Kinetochore Passenger Complex Regulates Septin Organization during Anaphase

Scott Thomas and Kenneth B. Kaplan

The Section of Molecular and Cellular Biology, University of California at Davis, Davis, CA 95616

Monitoring Editor: Tim Stearns

Kinetochore-passenger complexes in metazoans have been proposed to coordinate the segregation of chromosomes in anaphase with the induction of cytokinesis. Passenger protein homologues in the budding yeast, S. cerevisiae, play a critical role early in mitosis, ensuring proper biorientation of kinetochore-microtubule attachments. Our recent work has implicated the passenger protein Bir1p (Survivin) and the inner kinetochore complex, CBF3, in the regulation of septin dynamics during anaphase. Here we present data that is consistent with there being multiple passenger protein complexes. Our data show that Bir1p links together a large passenger complex containing Ndc10p, Sli15p (INCENP) and Ipl1p (Aurora B) and that the interaction between Bir1p and Sli15p is specifically involved in regulating septin dynamics during anaphase. Neither conditional alleles nor mutants of BIR1 that disrupt the interaction between Bir1p and Sli15p resulted in mono-attached kinetochores, suggesting that the Bir1p-Sli15p complex functions in anaphase and independently from Sli15p-Ipl1p complexes. We present a model for how discrete passenger complexes coordinate distinct aspects of mitosis.

Address correspondence to: Kenneth B. Kaplan (kbkaplan{at}ucdavis.edu)






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