Participation of proteasome-associating complex PC500 in starfish oocyte maturation as revealed by monoclonal antibodies |
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Authors: | Sawada Michiko Takagi Tamura Tomohiro Mitani Yasuo Kaya Motohiro Ito Genzo Hashimoto Hiroshi Sawada Hitoshi |
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Institution: | Research Institute of Genome-based Biofactory, National Institute of Advanced Industrial Science and Technology (AIST), Toyohira-ku, Sapporo 062-8517, Japan. takagi.sawadamichiko@aist.go.jp |
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Abstract: | We previously reported that immature starfish oocytes contain a novel 530-kDa proteasome-associating complex PC500 previously named PC530; E. Tanaka, M. Takagi Sawada, C. Morinaga, H. Yokosawa, H. Sawada, Isolation and characterization of a novel 530-kDa protein complex (PC 530) capable of associating with the 20S proteasome from star fish oocytes, Arch. Biochem. Biophys. 374 (2000) 181-188]. In the present study, in order to obtain an insight into the biological function of this complex, we investigated the effects of anti-PC500 monoclonal antibodies on oocyte maturation of the starfish Asterina pectinifera. A monoclonal antibody 7C5 strongly inhibited germinal vesicle breakdown (GVBD) in a concentration-dependent manner. In contrast to the inhibitory effect of the 7C5 antibody on GVBD, no inhibition of egg cleavage was observed in a 7C5-antibody-microinjected single blastomere in a 2-cell stage embryo. These results indicate that PC500 plays a key role in starfish oocyte maturation in a meiosis-specific manner. |
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Keywords: | Proteasome Oocyte maturation Ubiquitin Monoclonal antibody Starfish |
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