NDLI: Mitotic Spindle Integrity and Kinetochore Function Linked by the Duo1p/Dam1p Complex

Content Provider	PubMed Central
Author	Cheeseman, Iain M. Maria, Enquist-newman Thomas, Müller-reichert Drubin, David G. Barnes, Georjana
Copyright Year	2001
Abstract	Duo1p and Dam1p were previously identified as spindle proteins in the budding yeast, Saccharomyces cerevisiae. Here, analyses of a diverse collection of duo1 and dam1 alleles were used to develop a deeper understanding of the functions and interactions of Duo1p and Dam1p. Based on the similarity of mutant phenotypes, genetic interactions between duo1 and dam1 alleles, interdependent localization to the mitotic spindle, and Duo1p/Dam1p coimmunoprecipitation from yeast protein extracts, these analyses indicated that Duo1p and Dam1p perform a shared function in vivo as components of a protein complex. Duo1p and Dam1p are not required to assemble bipolar spindles, but they are required to maintain metaphase and anaphase spindle integrity. Immunofluorescence and electron microscopy of duo1 and dam1 mutant spindles revealed a diverse variety of spindle defects. Our results also indicate a second, previously unidentified, role for the Duo1p/Dam1p complex. duo1 and dam1 mutants show high rates of chromosome missegregation, premature anaphase events while arrested in metaphase, and genetic interactions with a subset of kinetochore components consistent with a role in kinetochore function. In addition, Duo1p and Dam1p localize to kinetochores in chromosome spreads, suggesting that this complex may serve as a link between the kinetochore and the mitotic spindle.
Starting Page	197
File Format	PDF
ISSN	15408140
e-ISSN	15408140
Journal	The Journal of Cell Biology
Issue Number	1
Volume Number	152
Language	English
Publisher	The Rockefeller University Press
Publisher Date	2001-01-08
Access Restriction	Open
Rights Holder	The Rockefeller University Press
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Medicine

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