一个来自深海水热喷口的无处不在的热酸性古物
Anna-Louise Reysenbach1, Yitai Liu, Amy B Banta
1Department of Biology, Portland State University, Portland, Oregon 97201, USA. reysenbacha@pdx.edu
Nature
|July 28, 2006
概括
研究人员从深海通风口中分离出了一种新型的热酸,这是硫和铁循环中的关键参与者. 这一发现推动了我们对极端环境中的微生物生命的理解.
科学领域:
- 微生物学 微生物学
- 地质化学 地质化学
- 海洋学 海洋学 海洋学
背景情况:
- 深海的热水喷口对全球生物地化学循环至关重要.
- 这些通风口在由矿物沉形成的独特微生物息地中容纳着多样化的原核生物.
- 之前的研究表明,通风流体的pH值较低,但极端热酸性仍然没有培养.
研究的目的:
- 从深海的热水风口沉积物中分离和培养一个广泛传播的DHVE2血统成员.
- 描述这种新型微生物的代谢能力和环境耐受性.
- 评估风口生态系统中热酸友的生态意义.
主要方法:
- 从深海热水风口样本中分离和培养微生物.
- 核糖体RNA基因测序用于遗传学识别.
- 生理学描述生长条件 (pH,温度) 和代谢活动 (硫或铁的减少).
主要成果:
- 成功地分离和培养了一种属于DHVE2欧古全系的新型热酸性异构菌.
- 隔离物在pH值3.35.8和5575°C之间生长最佳,表现出强制性的热酸友好特性.
- 这种有机体在风口样本中占据了高达15%的考古物种种群,表明了显著的生态丰富度.
结论:
- 热酸,特别是DHVE2系,在深海水热喷口中可培养和代谢活跃.
- 这些生物在这些极端环境中的硫和铁循环中发挥着潜在的重要作用.
- 这项研究首次成功培育了DHVE2成员,为研究风口微生物生态学和生物地球化学开辟了新的途径.
更多相关视频
相关概念视频
01:28Anoxygenic Phototrophic Bacteria
Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
01:21Hyperthermophilic Bacteria
Domain Bacteria includes some unique hyperthermophilic species. They exhibit remarkable adaptations that enable survival in extreme environments.Thermotoga species are rod-shaped, gram-negative, non-sporulating hyperthermophiles that form a sheath-like envelope called a toga. They ferment sugars or starch, producing lactate, acetate, CO₂, and H₂, and can also grow via anaerobic respiration using H₂ and ferric iron. Found in hot springs and hydrothermal vents, over 20% of their genes show strong...
01:30Diversity of Archaea I
Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
01:24Diversity of Archaea II
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
01:27Diversity of Archaea III
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like environments.Morphological...
01:29Diversity of Archaea IV
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist thermal...