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J. Cell Biol.,
Volume 143, Number 1, October 5, 1998 49-63
Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111
We have identified a 350-amino acid domain
in the kinetochore motor CENP-E that specifies kinetochore binding in mitosis but not during interphase.
The kinetochore binding domain was used in a yeast
two-hybrid screen to isolate interacting proteins that included the kinetochore proteins CENP-E, CENP-F,
and hBUBR1, a BUB1-related kinase that was found to
be mutated in some colorectal carcinomas (Cahill, D.P.,
C. Lengauer, J. Yu, G.J. Riggins, J.K. Wilson, S.D.
Markowitz, K.W. Kinzler, and B. Vogelstein. 1998. Nature. 392:300-303). CENP-F, hBUBR1, and CENP-E
assembled onto kinetochores in sequential order during
late stages of the cell cycle. These proteins therefore
define discrete steps along the kinetochore assembly
pathway.
Kinetochores of unaligned chromosome exhibited
stronger hBUBR1 and CENP-E staining than those of
aligned chromosomes. CENP-E and hBUBR1 remain
colocalized at kinetochores until mid-anaphase when
hBUBR1 localized to portions of the spindle midzone
that did not overlap with CENP-E. As CENP-E and
hBUBR1 can coimmunoprecipitate with each other
from HeLa cells, they may function as a motor-kinase complex at kinetochores. However, the complex distribution pattern of hBUBR1 suggests that it may regulate multiple functions that include the kinetochore and
the spindle midzone.
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