高水圧は,元素の硫黄の減少を促進することによって,深海のThermococcus aciditoleransの成長を促進しました
Ze-Xi Jiao1,2, Xue-Gong Li1,3,4, Wei-Jia Zhang1,3,4
1Laboratory of Deep-Sea Microbial Cell Biology, Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China.
Frontiers in microbiology
|September 3, 2025
まとめ
高水圧は深海のセルモコックスSY113の成長と硫黄の減少を促進します. この適応はmbsL遺伝子に依存し,浅水株と異なるSurRによってのみではなく,圧力によって制御されます.
科学分野:
- 微生物学
- 生物化学
- エクストレモフィルの研究
背景:
- サーモコッカス種は,元素硫黄 (S°) の還元をエネルギーとして利用する多様な水熱噴出所に住んでいます.
- SurRによるS°還元経路 (MBS,MBH) の調節は浅水株で知られている.
- 深海のサーモコッカスの高水圧 (HHP) 調節は,まだ十分に理解されていません.
研究 の 目的:
- 深海のThermococcus SY113の成長とS°減少に対するHHPの影響を調査する.
- MBSとMBHの遺伝子発現に対するHHPの規制効果を分析する.
- HHPの適応におけるS°減少の役割を決定する.
主な方法:
- 深海のサーモコッカスSY113を 水圧の変動下で培養する.
- 成長率とH2Sの生産を測定する
- MBSとMBHの遺伝子発現を 定量的に分析する
- 重要な遺伝子の遺伝的破壊 (mbsL,mbhL1)
主要な成果:
- HHPは,SY113におけるS°減少と成長を,SurRとは無関係に著しく強化した.
- mbsLの破壊は,HHPの下でH2Sの生産と成長を阻害し,その重要な役割を確認しました.
- 単一のMBS複合体は,圧力刺激による成長に十分であった.
- mbsL表現はS°依存であり,mbhL1はHHP誘発であり,どちらも相関表現を示す.
- HHPは,SY113におけるmbsL,mbhL1,mbhL2の遺伝子発現を調節し,SurRの調節とは異なる.
結論:
- S°の減少は,深海噴出口でのHHPへの適応に不可欠です.
- HHPは,深海の株におけるS°減少経路の調節に直接影響を与える.
- 深海のサーモコッカスの硫黄反応性遺伝子調節は浅水モデルと異なるため,ユニークな適応戦略を示しています.
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