Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Detection of Mitotic Centromere-Associated Kinesin (MCAK) During Cell-Cycle Progression of Human Jurkat T Cells Using Polyclonal Antibody Raised Against Its N- Terminal Region Overexpressed in E. coli

  • Jun, Do-Youn (Laboratory of Immunobiology, Department of Microbiology, Kyungpook National University) ;
  • Rue, Seok-Woo (Laboratory of Immunobiology, Department of Microbiology, Kyungpook National University) ;
  • Kim, Byung-Woo (Laboratory of Immunobiology, Department of Microbiology, Kyungpook National University) ;
  • Kim, Young-Ho (Laboratory of Immunobiology, Department of Microbiology, Kyungpook National University)
  • Published : 2003.12.01
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Abstract

Mitotic centromere-associated kinesin (MCAK), which is a novel kinesin with a central motor domain, is believed to playa role in mitotic segregation of chromosome during the M phase of the cell cycle. In the present study, it is shown that a rabbit polyclonal antibody has been produced using the N-terminal region (187 aa) of human MCAK expressed in E. coli as the antigen. To express the N-terminal region in E. coli, the MCAK cDNA fragment encoding N-terminal 187 aa was obtained by PCR and was then inserted into the pET 3d expression vector. Molecular mass of the N-terminal region overexpressed in the presence of IPTG was 23.2 kDa on SDS-PAGE, and the protein was insoluble and mainly localized in the inclusion body that could be easily purified from the other cellular proteins. The N-terminal region was purified by electro-elution from the gel after the inclusion body was resolved on the SDS-PAGE. The antiserum obtained after tertiary immunization with the purified protein specifically recognized HsMCAK when subjected to Western blot analysis, and showed a fluctuation of the protein level during the cell cycle of human Jurkat T cells. Synchronization of the cell-cycle progression required for recovery of cells at a specific stage of the cell cycle was performed by either hydroxyurea or nocadazole, and subsequent release from each blocking at 2, 4, and 7 h. Northern and Western analyses revealed that both mRNA and protein of HsMCAK reached a maximum level in the S phase and declined to a basal level in the G1 phase. These results indicate that a polyclonal antibody raised against the N-terminal region (187 aa) of HsMCAK, overexpressed in E. coli, specifically detects HsMCAK (81 kDa), and it can analyze the differential expression of HsMCAK protein during the cell cycle.

Keywords

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