Mouse zygote-specific proteasome assembly chaperone important for maternal-to-zygotic transition

  • Seung-Wook Shin
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Natsumi Shimizu
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Mikiko Tokoro
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Satoshi Nishikawa
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Yuki Hatanaka
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Masayuki Anzai
    Institute of Advanced Technology, Kinki University, 14-1 Minamiakasaka, Kainan, Wakayama 642-0017, Japan
  • Jun Hamazaki
    Laboratory of Protein Metabolism, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Satoshi Kishigami
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Kazuhiro Saeki
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Yoshihiko Hosoi
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Akira Iritani
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan
  • Shigeo Murata
    Laboratory of Protein Metabolism, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Kazuya Matsumoto
    Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa, Wakayama 649-6493, Japan

説明

<jats:title>Summary</jats:title> <jats:p>During the maternal-to-zygotic transition (MZT), maternal proteins in oocytes are degraded by the ubiquitin–proteasome system (UPS), and new proteins are synthesized from the zygotic genome. However, the specific mechanisms underlying the UPS at the MZT are not well understood. We identified a molecule named zygote-specific proteasome assembly chaperone (ZPAC) that is specifically expressed in mouse gonads, and expression of ZPAC was transiently increased at the mouse MZT. ZPAC formed a complex with Ump1 and associated with precursor forms of 20S proteasomes. Transcription of ZPAC genes was also under the control of an autoregulatory feedback mechanism for the compensation of reduced proteasome activity similar to Ump1 and 20S proteasome subunit gene expression. Knockdown of ZPAC in early embryos caused a significant reduction of proteasome activity and decrease in Ump1 and mature proteasomes, leading to accumulation of proteins that need to be degraded at the MZT and early developmental arrest. Therefore, a unique proteasome assembly pathway mediated by ZPAC is important for progression of the mouse MZT.</jats:p>

収録刊行物

  • Biology Open

    Biology Open 2 (2), 170-182, 2012-11-23

    The Company of Biologists

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