Abstract
The chromosomal passenger complex (CPC) coordinates chromosomal and cytoskeletal events of mitosis. The enzymatic core of this complex (Aurora-B) is guided through the mitotic cell by its companion chromosomal passenger proteins, inner centromere protein (INCENP), Survivin and Borealin/Dasra-B, thereby allowing it to act at the right place at the right time. Here, we addressed the individual contributions of INCENP, Survivin and Borealin to the proper functioning of this complex. We show that INCENP has an important role in stabilizing the complex, and that Borealin acts to promote binding of Survivin to INCENP. Importantly, when Survivin is directly fused to INCENP, this hybrid can restore CPC function at the centromeres and midbody, even in the absence of Borealin and the centromere-targeting domain of INCENP. Thus, Survivin is an important mediator of centromere and midbody docking of Aurora-B during mitosis.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Cell Cycle Proteins / genetics
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Cell Cycle Proteins / metabolism*
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Cell Line
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Centromere / metabolism*
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Chromosomal Proteins, Non-Histone / genetics
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Chromosomal Proteins, Non-Histone / metabolism*
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Cysteine Proteinase Inhibitors / genetics
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Cysteine Proteinase Inhibitors / metabolism
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Humans
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Inhibitor of Apoptosis Proteins
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Macromolecular Substances
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Microtubule-Associated Proteins / genetics
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Microtubule-Associated Proteins / metabolism*
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Mitosis
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Neoplasm Proteins / genetics
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Neoplasm Proteins / metabolism*
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Protein Binding
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RNA Interference
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RNA, Small Interfering / genetics
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RNA, Small Interfering / metabolism
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Recombinant Fusion Proteins / genetics
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Recombinant Fusion Proteins / metabolism
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Survivin
Substances
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BIRC5 protein, human
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CDCA8 protein, human
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Cell Cycle Proteins
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Chromosomal Proteins, Non-Histone
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Cysteine Proteinase Inhibitors
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INCENP protein, human
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Inhibitor of Apoptosis Proteins
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Macromolecular Substances
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Microtubule-Associated Proteins
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Neoplasm Proteins
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RNA, Small Interfering
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Recombinant Fusion Proteins
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Survivin