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Cell Cycle
Article
Data sources: UnpayWall
Cell Cycle
Article . 2006 . Peer-reviewed
Data sources: Crossref
Cell Cycle
Article . 2006
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An Extended Anaphase Signaling Pathway for Mad2p Includes Microtubule Organizing Center Proteins and Multiple Motor-dependent Transitions

Authors: Christina, Mayer; Jason, Filopei; Joe, Batac; Lea, Alford; Janet L, Paluh;

An Extended Anaphase Signaling Pathway for Mad2p Includes Microtubule Organizing Center Proteins and Multiple Motor-dependent Transitions

Abstract

Signaling pathways within the mitotic mechanism temporally orchestrate spindle assembly with chromosome capture and alignment, and then coordinate initiation of chromosome segregation with spindle breakdown and cytokinesis for reproductive success. Kinetochore localized Mad2p acts in the spindle assembly checkpoint pathway during prophase and prometaphase to monitor bipolar attachment of chromosomes to spindle microtubules as well as proper tension at kinetochores. Once established, Mad2p is not degraded, but instead transits to spindle poles preceding the metaphase/anaphase transition in human and yeast cells. Whether conserved relocalization of Mad2p to poles is a final step in the spindle assembly checkpoint pathway or whether the post-metaphase transition allows Mad2p to cooperate in anaphase events leading to mitotic exit has been unknown. We examined post-metaphase localization of Mad2p in fission yeast. Our observations indicate an extended signaling pathway for Mad2p that includes kinetochore to bipolar localization at spindle poles, then additional transitions from bipolar to unipolar to equatorial. We determined that Mad2p associates with the microtubule organizing center complex through direct binding to Alp4p and that microtubule motor proteins Kinesin-14 Pkl1 and Dynein contribute to Mad2p anaphase transitions. At anaphase B onset, bipolar to unipolar transitions of both Mad2p and the septation inititiation network (SIN) kinase Cdc7 are observed. We determined that Mad2p and Cdc7p transitions monitor different events in anaphase, but that neither are required for anaphase B initiation. Our findings indicate that altered Mad2p anaphase spindle localizations can reflect changes in spindle function during mitotic exit that could contribute to fidelity in anaphase events.

Related Organizations
Keywords

Cell Polarity, Dyneins, Kinesins, Nuclear Proteins, Cell Cycle Proteins, Protein Serine-Threonine Kinases, Tubulin, Mad2 Proteins, Mutation, Schizosaccharomyces, Schizosaccharomyces pombe Proteins, Anaphase, Microtubule-Organizing Center, Cytokinesis, Protein Binding, Signal Transduction

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    22
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
22
Average
Average
Top 10%
bronze