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Vol. 9, Issue 4, 775-793, April 1998
-Tubulin Complex into the Nucleus and
Is Subject to Cell Cycle-dependent Phosphorylation on the Nuclear Side
of the Spindle Pole Body
Max-Planck Institut für Biochemie, 82152 Martinsried, Germany
In the yeast Saccharomyces cerevisiae, microtubules
are organized by the spindle pole body (SPB), which is embedded in the nuclear envelope. Microtubule organization requires the
-tubulin complex containing the
-tubulin Tub4p, Spc98p, and Spc97p. The Tub4p
complex is associated with cytoplasmic and nuclear substructures of the
SPB, which organize the cytoplasmic and nuclear microtubules. Here we
present evidence that the Tub4p complex assembles in the cytoplasm and
then either binds to the cytoplasmic side of the SPB or is imported
into the nucleus followed by binding to the nuclear side of the SPB.
Nuclear import of the Tub4p complex is mediated by the essential
nuclear localization sequence of Spc98p. Our studies also indicate that
Spc98p in the Tub4p complex is phosphorylated at the nuclear, but not
at the cytoplasmic, side of the SPB. This phosphorylation is cell cycle
dependent and occurs after SPB duplication and nucleation of
microtubules by the new SPB and therefore may have a role in mitotic
spindle function. In addition, activation of the mitotic checkpoint
stimulates Spc98p phosphorylation. The kinase Mps1p, which functions in
SPB duplication and mitotic checkpoint control, seems to be involved in
Spc98p phosphorylation. Our results also suggest that the nuclear and cytoplasmic Tub4p complexes are regulated differently.
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