在现代和古代Sabkha环境中比较蛋白质稳定性:对古代火星上的分子残骸的影响
Qitao Hu1,2, Ting Huang1,2, Aili Zhu1,2
1State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau 999078, China.
International journal of molecular sciences
|July 12, 2025
概括
萨克哈沉积物显示,矿物成分,特别是碳酸盐-基质,显著影响长期蛋白质的保存. 这些发现对于识别火星上可能存在的古代生命至关重要.
科学领域:
- 天体生物学 天体生物学
- 地质化学 地质化学
- 微生物生态学 微生物生态学
背景情况:
- 了解极端环境中的蛋白质保存是检测火星上分子生物标志的关键.
- 萨布卡环境作为火星蒸发条件的有价值的类比.
研究的目的:
- 研究矿物学和环境因素如何影响sabkha沉积物的长期蛋白质稳定性.
- 评估sabkha沉积物的潜力,作为在火星上保存生物标记的类型.
主要方法:
- 分析了阿布扎比海岸 (公元前0-11,000年) 的五个sabkha沉积样本.
- 使用液体染色学-质谱/质谱 (LC-MS/MS) 和数据独立获取 (DIA) 蛋白质组学.
- 确定了722个蛋白质组和1300个.
主要成果:
- 蛋白质的保存与矩阵组成有很强的相关性;富含碳酸盐和二氧化的样本显示出更好的保留.
- 由于盐度高,岩和石膏面的蛋白质回收率较低.
- 在古代样本中观察到从代谢到基因组维护蛋白的转变,表明了适应.
- 大型多域蛋白质的保存表明,矿物质封装稳定了数千年来复杂的生物分子.
- 重建的考古多样性,包括Thaumarchaeota和热友血统.
结论:
- 萨布卡矿物学决定了蛋白质的保存潜力,碳酸盐-基质是最佳的.
- 在sabkha沉积物中的古老蛋白质提供了对微生物适应高盐应激的洞察力.
- 火星上的碳酸盐-基板可以保存古代生命的分子痕迹.
更多相关视频
07:22How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project
Published on: February 11, 2019
28.5K
06:18Optimized Bone Sampling Protocols for the Retrieval of Ancient DNA from Archaeological Remains
Published on: November 30, 2021
4.1K
相关概念视频
Diversity of Archaea IV
114
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...
114
Diversity of Archaea III
80
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...
80
Overview of Archaea
154
Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
154
Conservation of Protein Domains Over Different Proteins
11.4K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
11.4K
Conditions on Early Earth
96.8K
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
96.8K
RNA Stability
33.9K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
33.9K
