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相关概念视频

ATP Synthase: Structure01:18

ATP Synthase: Structure

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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...
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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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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...
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ATP Driven Pumps I: An Overview01:27

ATP Driven Pumps I: An Overview

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
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ATP Energy Storage and Release01:31

ATP Energy Storage and Release

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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...
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ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
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Mechanical Protein Functions01:58

Mechanical Protein Functions

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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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将一种依赖ATP的酶转化为一个消散性,自组装系统.

Yiying Li1, Jie Zhu1, Zhiyin Zhang1

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA.

Nature chemical biology
|January 13, 2025
PubMed
概括

研究人员将FtsH酶改造成自组装螺旋式纳米管. 这些依赖腺5'-三酸盐 (ATP) 的结构模仿了自然的细胞骨组件,使用化学能量进行短暂的形成和降解.

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科学领域:

  • 生物化学 生化学
  • 材料科学 材料科学 材料科学
  • 分子生物学分子生物学

背景情况:

  • 核三酸盐 (NTP) 相关的蛋白质组合,如微管和活性丝,在细胞过程中至关重要,并激发了合成分子机器.
  • 自然系统的功能复杂性仍然是人工设计的一个挑战.

研究的目的:

  • 将一种依赖于腺5-三酸盐 (ATP) 的酶设计成一个消散式自组装系统.
  • 在人工系统中改变化学能量的结构和功能利用.

主要方法:

  • 工程 FtsH (丝状温度敏感蛋白酶 H) 六次性ATPase.
  • 研究自组装成一维螺旋式纳米管的方法.
  • 在外部ATPases的存在下分析ATP水解和组装动态.

主要成果:

  • FtsH成功地被设计成螺旋式纳米管.
  • 这些纳米管是消散系统,需要不断的ATP输入以保持完整性,并随着时间的推移降解.
  • 与自然系统不同,ATP水解由自由原体催化,纳米管保存ATP,导致可调节的寿命.

结论:

  • 工程FtsH纳米管代表了一种新的消散式自组装系统.
  • 这项工作展示了在人工分子组件中利用化学能量的新范式.
  • 调整组件寿命的能力为控制纳米材料应用提供了潜力.