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Mol. Cell. Biol., Sep 1995, 5017-5029, Vol 15, No. 9
X Zhu, MA Mancini, KH Chang, CY Liu, CF Chen, B Shan, D Jones, TL Yang-Feng and WH Lee
A gene assigned to human chromosome 1q32-41 encodes a novel protein of
3,113 amino acids containing an internal tandem repeat of 177 amino acids.
The protein, which we have named "mitosin," was identified by direct
binding to purified retinoblastoma protein in vitro with a region distantly
related to the retinoblastoma protein-binding site of E2F-1. Mitosin is
expressed throughout S, G2, and M phases of the cell cycle but is absent in
G1. Its localization is dramatically reorganized from a rather homogeneous
nuclear distribution in S phase to paired dots at the
kinetochore/centromere region, to the spindle apparatus, and then to the
midbody during M-phase progression. This spatial reorganization coincides
closely with the temporal phosphorylation patterns of mitosin.
Overexpression of N-terminally truncated mutants blocks cell cycle
progression mainly at G2/M. These results suggest that mitosin may play an
important role in mitotic-phase progression.
Copyright © 1995, American Society for Microbiology
Characterization of a novel 350-kilodalton nuclear phosphoprotein that is specifically involved in mitotic-phase progression
Center for Molecular Medicine, University of Texas Health Science Center at San Antonio 78245, USA.
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