通过微生物酶守门来解锁冷中的隐形碳汇
Jialing Li1, Jingchun Feng1,2, Pandeng Wang3
1Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China.
Research (Washington, D.C.)
|August 27, 2025
概括
海洋微生物在深海冷中转化陆地红素. 这项研究揭示了新的代谢途径,并强调了这些微生物在碳循环和温室气体产生中的全球作用.
科学领域:
- 海洋微生物学
- 生物地质化学
- 深海生态
背景情况:
- 对于海洋碳循环至关重要,
- 陆地线素是冷沉积物中的重要碳来源,但其微生物分解情况尚不清楚.
- 了解红素代谢是评估深海碳循环的关键.
研究的目的:
- 在深海冷沉积物中研究红素分布和微生物代谢.
- 确定参与素降解的微生物群落和代谢途径.
- 评估冷的素分解剂的全球流行和独特的酶策略.
主要方法:
- 在海马冷层的沉积层中分析线素的分布.
- 实验室丰富培养物使用红素作为唯一的碳来源.
- 微生物群落及其代谢活动的多基因组学 (基因组学,转录组学) 分析.
- 通过多个冷系统进行了植物遗传调查.
主要成果:
- 宁丰富重组了微生物群落,使Burkholderiales,Pseudomonadales和Rhizobiales受益.
- 确定了两层的代谢途径:酶性素脱聚化 (dyP型过氧化酶,LigEFG) 和随后的芳香中间分解 (protocatechuate二氧化酶途径).
- 虽然没有观察到直接的甲基生成,但表明了甲基化潜力,并且在全球范围内,红素分解物表现出不同的酶谱.
结论:
- 陆地有机碳的深海微生物降解可能被低估.
- 冷微生物使用独特的酶策略来分解木质素,与陆地系统不同.
- 红素分解有助于温室气体储存,通过启动甲原体,将耐火碳循环与甲生产联系起来.
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