细胞外聚合物质的降解塑造了微生物社区的多样性
Sammy Pontrelli1,2,3, Kian Bigovic Villi1, Andreas Sichert1
1Institute of Molecular Systems Biology, ETH Zürich, Zürich, Switzerland.
PLoS biology
|July 29, 2025
概括
微生物群落使用细胞外聚合物物质 (EPS) 作为主要的碳来源,而不仅仅是小分子. 这种复杂的物质为不同的微生物群落提供燃料,并创造时间,影响生态系统功能.
科学领域:
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
- 分子生态学分子生态学
背景情况:
- 代谢交叉养,即微生物之间的代谢物交换,对于各种生态系统中的社区动态至关重要.
- 由于测量挑战,细胞外聚合物 (EPS) 在微生物交叉养中的作用在很大程度上是未知的.
- 基降解微生物提供了一个模型系统来调查EPS参与交叉养.
研究的目的:
- 量化细胞外聚合物物质 (EPS) 分泌与基降解剂中的小代谢物相比.
- 研究不同EPS来源对微生物群落结构的影响.
- 阐明EPS的降解途径及其在创造代谢中的作用.
主要方法:
- 使用碳酸缓冲生物反应器与元素分析相结合,以量化EPS和小代谢物分泌.
- 采用了体外酶测定和非向代谢学来研究EPS降解.
- 分析了海洋素降解分离物和相关的海水群体.
主要成果:
- 大约25%的碳排放由基降解剂是以EPS的形式,在隔离物和社区中观察到类似的水平.
- 针对不同的微生物群落选择了不同的EPS来源.
- EPS经历了连续的退化,创造了时间代谢,将社区组成从专家转变为通用主义者.
结论:
- 细胞外聚合物 (EPS) 是微生物交叉养网络的重要和动态组成部分.
- EPS的顺序分解影响了微生物社区的组合和整个生态系统的功能.
- 这项研究揭示了微生物相互作用和生态系统功能中以前未知的复杂层.
相关概念视频
01:29Biofilms
278
Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
278
01:29Microbial Morphologies
845
Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
845
01:28Gene Regulation in Microbial Communities: Quorum Sensing
93
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
93
01:28Antimicrobial Effectiveness
163
The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
163