S. cerevisiaeは,哺乳類のBiPに序列と機能で同類である必須タンパク質をコードする
K Normington1, K Kohno, Y Kozutsumi
1Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas 75235.
Cell
|June 30, 1989
まとめ
哺乳類のBiPタンパク質は,分泌タンパク質の折り畳みを促進する. 細胞成長に不可欠な酵母BiPは,KAR2と同一であり,BiPの欠乏がエンドプラズマ網膜における広範なタンパク質の誤折れを引き起こすことを示唆しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- エンドプラズマの網膜 (ER) は,哺乳類の細胞の78 kdタンパク質 (BiP) を収容し,分泌およびトランスメブランタンパク質の折り畳みに不可欠です.
- BiPは分子チャペロンとして作用し,ER内の適切なタンパク質構成を促進します.
研究 の 目的:
- S. cerevisiae.におけるマウスBiPの同類遺伝子を調査する.
- 酵母BiPの細胞プロセスにおける機能と本質を理解する.
主な方法:
- マウスのBiPcDNAを用いて,酵母BiPをコードする同種遺伝子の分離.
- 酵母とマウスのBiPを比較したシーケンス分析.
- 哺乳類のBiPをS. cerevisiae KAR2変異体で発現する補足研究.
主要な成果:
- 酵母BiP遺伝子が分離され,682種のアミノ酸をコードし,431種がマウスBiPと同一であった.
- 酵母BiPはHSP70のような遺伝子であり,ERの展開されたポリペプチドによって転写的に調節されます.
- イーストのBiP遺伝子はKAR2遺伝子と同一であり,細胞成長に不可欠である.
- 哺乳類のBiP発現は,温度に敏感なKAR2変異体を補完した.
結論:
- 酵母BiPは細胞の生存に重要な役割を果たし,哺乳類のBiPに同型です.
- BiPの欠乏は,ERにおける一般的なタンパク質折り畳み障害につながる可能性があります.
- ERタンパク質の折りたたみ欠陥は,細胞代謝にプレオトロプ的影響を及ぼす可能性があります.
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