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异体细胞甘油脂生物合成的出现和演变使蓝藻细菌能够在蓝藻细菌中进行专门的固定

Ruth Pérez Gallego¹, F A Bastiaan von Meijenfeldt¹, Nicole J Bale¹

¹Department of Marine Microbiology and Biogeochemistry, Royal Netherlands Institute for Sea Research (NIOZ), Den Burg 1790 AB, The Netherlands.

Proceedings of the National Academy of Sciences of the United States of America

|January 27, 2025

概括

异质细胞糖脂 (HGs) 对于菌中固定至关重要. 它们从更简单的类似物进化,揭示了这些专门的细胞是如何出现的,有助于理解早期生命和多细胞性.

科学领域:

生物地质化学生物地质化学
进化生物学进化生物学
微生物学微生物学

背景情况:

异体细胞是专门用于固的蓝藻细菌细胞,受到异体细胞甘油脂 (HGs) 的保护.
多种HG被保存在沉积物中,作为过去固化的生物标志物,并可能反映古环境条件.
HG中的结构变化表明了分类学信息和环境联系.

研究的目的:

为了重建异体糖脂 (HG) 结构在蓝色细菌的进化史.
研究HG生物合成途径的起源和多样化.
探索HG和HG类似物作为蓝菌进化的生物标志物的潜力.

主要方法:

在多种不同的蓝藻细菌中对异体细胞糖脂 (HGs) 的全面鉴定.
在蓝藻细菌基因组内选HG生物合成基因集群.
对HG结构及其相应的遗传途径进行比较分析.

主要成果:

观察到HG结构的融合进化,不同的蓝藻细菌群产生相同的HG.
原始的HG生物合成机器早于异质细胞的出现,具有与固定无关的功能.
HG类似物,HG的前体,在非异质细胞的蓝藻细菌中发现,表明一种进化途径.

结论:

异体细胞糖脂 (HGs) 通过基因组重组和扩张从先前存在的生物合成机器进化.
在有氧环境中,HG的发展对于蓝藻细菌异质细胞的兴起至关重要.
HG和类似物的基因组产物为研究蓝藻细菌多细胞性和劳动分工的进化提供了化石的潜力.

关键词:

生物合成基因集群生物合成基因集群异位细胞甘油脂生物合成不同细胞的蓝藻细菌.脂质生物标志物脂质生物标志物固化的方法固化的方法

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