微重力对黑色素生物生产的制约:在国际空间站上研究大肠杆菌的代谢反应
Tiffany M Hennessa1, Eric S VanArsdale1, Dagmar Leary1
1Center for Bio/Molecular Science and Engineering, U.S. Naval Research Laboratory, Washington, DC, USA.
NPJ microgravity
|January 22, 2026
概括
微重力显著降低了国际空间站大肠杆菌中的黑色素产量,影响了太空生物制造. 这是由于微生物新陈代谢的改变和氧化应激的增加造成的,阻碍了有效的生物合成.
科学领域:
- 微生物学 微生物学
- 空间生物学 空间生物学
- 生物技术是生物技术.
背景情况:
- 太空生物制造对于长期任务至关重要,它依赖于工程微生物.
- 微重力对微生物代谢和生物合成效率构成挑战.
- 在大肠杆菌中研究了黑色素的产生,作为太空生物制造的模型.
研究的目的:
- 研究微重力对大肠杆菌中的黑色素生物合成的影响.
- 了解影响太空微生物产生的代谢和生理变化.
- 确定在外星环境中优化生物制造的战略.
主要方法:
- 在国际空间站 (ISS) 进行的对非运动性大肠杆菌 (Escherichia coli) 的实验.
- 利用差分脉冲电压测量来分析细胞外的氨酸水平.
- 在旋转壁容器生物反应器中采用低剪切模拟微重力 (LSMMG).
- 进行蛋白质组和代谢组分析,以评估细胞变化.
主要成果:
- 与地面对照相比,在国际空间站种植的大肠杆菌表现出明显较低的黑色素产量.
- 在微重力下,高的细胞外氨酸表明了低效的氨酶活性.
- LSMMG实验证实了减少黑色素的产生和细菌的活力.
- 蛋白质组学揭示了与压力相关的蛋白质的增加;代谢组学显示了升高的三糖和降低的谷氨,表明氧化压力.
结论:
- 微重力会对细菌代谢和大肠杆菌中的黑色素生物合成产生负面影响.
- 不高效的基质催化和氧化应激是太空生物制造的关键挑战.
- 这些发现为增强太空环境中的微生物生产能力提供了关键的见解.
相关概念视频
01:23Stringent Response in E. coli
312
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
312
01:31Internal Receptors
74.3K
Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
74.3K
01:26Constraints and Statical Determinacy
957
In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
957
02:00Internal Energy
36.6K
The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with initial internal energy, Uinitial, undergoes a change in energy (transfer of work or heat), and the final internal energy of the system is Ufinal. Change in internal energy equals the difference between Ufinal and Uinitial.
36.6K
00:52What is Metabolism?
131.4K
Overview
131.4K
01:27State Space Representation
541
The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
Consider an RLC circuit, a...
541