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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
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相关实验视频

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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通过异质接口工程和酶驱动的分子机器来实现适应性三模生物分析系统.

Lin Sun1, Wan-Zhen Xie2, Yu Ya3

  • 1Key Laboratory of Optic-electric Chemo/Biosensing and Molecular Recognition (Guangxi Minzu University), Education Department of Guangxi Zhuang Autonomous Region; Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission; School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China.

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概括

这项研究引入了一种新的三模生物传感平台,用于超敏感病原体检测. 它的自适应信号融合和酶驱动机器实现了诊断的特殊灵敏度和可靠性.

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科学领域:

  • 纳米材料和生物感应
  • 异质接口工程 异质接口工程
  • 由酶驱动的分子机器

背景情况:

  • 病原体检测需要超敏感和可靠的方法.
  • 现有的生物传感平台在灵敏度,特异性和多模式检测方面存在局限性.
  • 先进的纳米材料和信号放大策略对于提高生物传感器性能至关重要.

研究的目的:

  • 开发一个用于超敏感病原体检测的三模生物传感平台.
  • 整合异质接口工程和酶驱动的分子机器,以提高性能.
  • 为了实现适应性信号融合,实现可靠和准确的检测.

主要方法:

  • 制造具有增强表面积和电子传输的Ni-MOF-on-Co-MOF异构结构.
  • 纳入Au@Ni/Co ZIF@PDA,以实现高效的光热转换.
  • 利用外核酶III介导的目标循环和DNA步行者级联放大用于信号放大.
  • 集成的电化学,色度和光热检测模式.

主要成果:

  • 达到的超敏感检测极限为31.4aM (电化学),1.32fM (色学) 和1.14fM (光热).
  • 证明了内置的自我验证和纠正,以提高可靠性.
  • 与真实样本进行验证,显示与qPCR有很强的一致性和高的康复率 (96.1-103.4%).

结论:

  • 三模生物传感平台为病原体检测提供了一种新,强大和高度敏感的方法.
  • 适应性智能多信号交叉检查提高了复杂样本分析的可靠性.
  • 这项技术在农业疾病诊断,食品安全和临床诊断方面显示出重大前景.