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Nud1p links astral microtubule organization and the control of exit from mitosis
Author(s) -
Gruneberg Ulrike,
Campbell Kirsteen,
Simpson Clare,
Grindlay Joan,
Schiebel Elmar
Publication year - 2000
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1093/emboj/19.23.6475
Subject(s) - biology , microbiology and biotechnology , astral microtubules , mitotic exit , spindle pole body , mitosis , spindle apparatus , spindle checkpoint , microtubule , cell division , genetics , cell
The budding yeast spindle pole body (SPB) not only organizes the astral and nuclear microtubules but is also associated with a number of cell‐cycle regulators that control mitotic exit. Here, we describe that the core SPB component Nud1p is a key protein that functions in both processes. The astral microtubule organizing function of Nud1p is mediated by its interaction with the γ‐tubulin complex binding protein Spc72p. This function of Nud1p is distinct from its role in cell‐cycle control: Nud1p binds the spindle checkpoint control proteins Bfa1p and Bub2p to the SPB, and is part of the mitotic exit network (MEN) in which it functions upstream of CDC15 but downstream of LTE1 . In conditional lethal nud1‐2 cells, the MEN component Tem1p, a GTPase, is mislocalized, whereas the kinase Cdc15p is still associated with the SPB. Thus, in nud1‐2 cells the failure of Tem1p to interact with Cdc15p at the SPB probably prevents mitotic exit.