Identification of α-type subunits of the Xenopus 20S proteasome and analysis of their changes during the meiotic cell cycle

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Identification of α-type subunits of the Xenopus 20S proteasome and analysis of their changes during the meiotic cell cycle

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BioMed Central
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PMC
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  • Biology
  • Chemistry
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Abstract

1471-2091-5-18.fm ral ss BioMed CentBMC Biochemistry Open AcceResearch article Identification of α-type subunits of the Xenopus 20S proteasome and analysis of their changes during the meiotic cell cycle Yuka Wakata1, Mika Tokumoto1,2, Ryo Horiguchi1,2, Katsutoshi Ishikawa1, Yoshitaka Nagahama2,3 and Toshinobu Tokumoto*1,2 Address: 1Department of Biology and Geosciences, Faculty of Science, National University Corporation Shizuoka University, Shizuoka 422-8529, Japan, 2CREST Research Project, Japan Science and Technology Corporation, Japan and 3Laboratory of Reproductive Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan Email: Yuka Wakata - [email protected]; Mika Tokumoto - [email protected]; Ryo Horiguchi - [email protected]; Katsutoshi Ishikawa - [email protected]; Yoshitaka Nagahama - [email protected]; Toshinobu Tokumoto* - [email protected] * Corresponding author Abstract Background: The 26S proteasome is the proteolytic machinery of the ubiquitin-dependent proteolytic system responsible for most of the regulated intracellular protein degradation in eukaryotic cells. Previously, we demonstrated meiotic cell cycle dependent phosphorylation of α4 subunit of the 26S proteasome. In this study, we analyzed the changes in the spotting pattern separated by 2-D gel electrophoresis of α subunits during Xenopus oocyte maturation. Results: We identified cDNA for three α-type subunits (α1, α5 and α6) of Xenopus, then prepared antibodies specific for five subunits (α1, α3, α5, α6, and α7). With these antibodies and previously described monoclonal antibodies for subunits α2 and α4, modifications to all α-type subunits of the 26S proteasome during Xenopus meiotic maturation were examined by 2D-PAGE. More than one spot for all subunits except α7 was identified. Immunoblot analysis of 26S proteasomes purified from immature and mature oocytes showed a difference in the blots of α2 and α4, with an additional spot

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