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http://dx.doi.org/10.5352/JLS.2005.15.2.253

Differential Intracellular Localization of Mitotic Centromere-associated Kinesin (MCAK) During Cell Cycle Progression in Human Jurkat T Cells  

Jun Do Youn (Institute of Genetic Engineering, Kyungpook National University)
Rue Seok Woo (Laboratory of Immunobiology, Department of Microbiology, College of Natural Sciences, Kyungpook National University)
Kim Su-Jung (Laboratory of Immunobiology, Department of Microbiology, College of Natural Sciences, Kyungpook National University)
Kim Young Ho (Laboratory of Immunobiology, Department of Microbiology, College of Natural Sciences, Kyungpook National University)
Publication Information
Journal of Life Science / v.15, no.2, 2005 , pp. 253-260 More about this Journal
Abstract
Mitotic centromere-associated kinesin (MCAK), which is a member of the Kin I (internal motor domain) subfamily of kinesin-related proteins, is known to play a role in mitotic segregation of chromosome during M phase of the cell cycle. In the present study, we have produced a rat polyclonal antibody using human MCAK (HsMCAK) expressed in E. coli as the antigen. The antibody specifically recognized the HsMCAK protein (81 kDa), and could detect its nuclear localization in human Jurkat T cells and 293T cells by Western blot analysis. The specific stage of the cell cycle was obtained through blocking by either hydroxyl urea or nocodazole and subsequent releasing from each blocking for 2, 4, and 7 h. While the protein level of HsMCAK reached a maximum level in the S phase with slight decline in the $G_{2}-M$ phase, the electrophoretic mobility shift from $p81^{MCAK}\;to\;p84^{MCAK}$ began to be induced in the late S phase and reached a maximum level in the $G_{2}/M $ phase, and then it disappeared as the cells enter into the $G_{1}$ phase. Immunocytochemical analysis revealed that HsMCAK protein localized to centrosome and nucleus at the interphase, whereas it appeared to localize to the spindle pole, centromere of the condensed mitotic DNA, spindle fiber, or midbody, depending on the specific stage of the M phase. These results demonstrate that a rat polyclonal antibody raised against recombinant HsMCAK expressed in E. coli specifically detects human MCAK, and indicate that the electrophoretic mobility shift from $p81^{MCAK}\;to\;p84^{MCAK}$, which may be associated with its differential intracellular localization during the cell cycle, fluctuates with a maximum level of the shift at the $G_{2}-M$ phase.
Keywords
human MCAK; motor protein; rat polyclonal anti-HsMCAK; electrophoretic mobility shift; differential expression; cell cycle; Jurkat T cells;
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