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過剰な膜合成は,細胞増殖の原始的なモードを駆動する
Romain Mercier1, Yoshikazu Kawai, Jeff Errington
1Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Medical School, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, UK.
Cell
|March 5, 2013
まとめ
バクテリアは,細胞壁を脱ぎ捨てて,壁のないL型状態に入り,膜ブレッブによって分裂します. 過剰な膜合成または表面面積と体積比の増加が,このユニークな細菌の増殖を促します.
科学分野:
- 微生物学 微生物学とは
- 細胞生物学 細胞生物学
- バイオフィジックス 生物物理学
背景:
- ペプチドグリカン細胞壁は,バクテリアの特徴である.
- 多くのバクテリアは,可逆的に壁のないL型状態に入ることができる.
- L型増殖は,標準的なFtsZ依存分裂経路を回避する.
研究 の 目的:
- L形態の増殖を促すメカニズムを調査する.
- 生物物理的要因がL型分裂に影響するかどうかを判断する.
- 初期の細胞進化を研究するためのモデルを確立する.
主な方法:
- 変異によってバチルス・サブティリスのL型分裂を誘導する.
- 膜合成と表面積と体積の比率を操作する.
- 細胞の形状の変化や分裂過程を観察する.
主要な成果:
- 過剰な膜合成を引き起こす変異は,L型分裂を促進する.
- 野生型のプロトプラストの表面面積と体積比を増加させると,同様の分裂を誘導する.
- L型分裂は,膜動力学と生体物理学的特性に関連しています.
結論:
- バクテリアのL型分裂は,FtsZから独立した単純な生体物理的プロセスによって引き起こされる.
- これらの発見は,初期の細胞増殖の進化についての洞察を提供します.
- L型は,細胞分裂と進化を研究するためのモデルを提供します.
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