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相关概念视频

ATP Energy Storage and Release01:31

ATP Energy Storage and Release

9.4K
ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...
9.4K
Phosphorylation01:02

Phosphorylation

50.3K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
50.3K
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

14.5K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
14.5K
ATP Synthase: Structure01:18

ATP Synthase: Structure

12.3K
ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
12.3K
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

2.1K
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.1K
Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
13.1K

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Enzymatic Modification and Flow Cytometry Assessment of Yeast Surface Displayed Proteins
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通过无酶,动态酸化的活性液滴.

Simone M Poprawa1, Michele Stasi1, Brigitte A K Kriebisch1

  • 1Department of Bioscience, Technical University of Munich, Lichtenbergstrasse 4, 85748, Garching, Germany.

Nature communications
|May 17, 2024
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概括
此摘要是机器生成的。

研究人员开发了一种无酶系统,用于动态酸化,模仿生物能量转移. 该系统控制相分离,产生由连续化学反应为燃料的活性滴.

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科学领域:

  • 生物化学 生物化学
  • 超分子化学 超分子化学
  • 合成生物学 合成生物学

背景情况:

  • 生命利用能量转导通过像ATP这样的分子通过酸化来调节蛋白质功能.
  • 动态酸化是调节细胞功能的关键生物过程.
  • 目前的合成系统缺乏无酶的方法来动态化超分子过程.

研究的目的:

  • 开发一种用于动态酸化的无酶合成系统.
  • 通过使用反应分子中储存的能量来研究超分子过程的调节.
  • 为了建模生物酸化,并探索原细胞的形成.

主要方法:

  • 设计了一个无酶的反应循环,使用单胺酸作为酸化剂.
  • 伊斯蒂丁和含有伊斯蒂丁的被暂时酸化.
  • 通过水解研究了酸化物种的可变性和失活性.
  • 评估了系统对不同前体和半衰期的可调性.
  • 研究了化产品对相分离的影响.

主要成果:

  • 成功建立了一个无酶的酸化循环,消耗单胺基酸盐.
  • 酸化的伊斯蒂丁被合成,并被证明是可变的,通过水解去活化.
  • 该系统在化多种前体,可控制半衰期方面展示了多功能性和可调性.
  • 化产品被证明可以调节相分离,形成活性滴.
  • 这些活跃的水滴需要持续的燃料转化来维持它们的结构.

结论:

  • 本研究介绍了第一个动态酸化的无酶合成系统,为超分子调节提供了一种新的方法.
  • 开发的系统可以作为一个有价值的模型来理解生物酸化机制.
  • 这些发现提供了关于活跃滴的形成和行为的见解,这与原细胞研究有关.
  • 该系统的可调性性质允许在合成生物学和材料科学中进行多种应用.