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相关概念视频

Studying the Cytoskeleton01:17

Studying the Cytoskeleton

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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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The Movement of Organelles and Vesicles01:43

The Movement of Organelles and Vesicles

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In eukaryotic cells,  cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
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Destabilization of Microtubules01:45

Destabilization of Microtubules

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The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

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Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
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Anaphase A and B01:39

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Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
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The Equilibrium Binding Constant and Binding Strength02:18

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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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Use of Stopped-Flow Fluorescence and Labeled Nucleotides to Analyze the ATP Turnover Cycle of Kinesins
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绑定离子效应:使用机器学习方法研究素Ncd与微管体的结合.

Wenhan Guo1, Dan Du2, Houfang Zhang3

  • 1College of Physical Science and Technology, Central China Normal University, Hubei, China; Computational Science Program, University of Texas at El Paso, El Paso, Texas.

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概括

研究离子对运动蛋白相互作用的影响是关键. 使用混合溶剂方法明确建模结合离子,显著改善了充电生物分子的静电计算.

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科学领域:

  • 生物物理学的生物物理.
  • 计算生物学 计算生物学
  • 结构生物学 结构生物学

背景情况:

  • 果 Ncd 蛋白质是旋组织的关键运动蛋白质.
  • Ncd和蛋白二极体具有高电荷,使离子相互作用显著.
  • 隐式溶剂模型可能无法准确地捕捉电荷生物分子上的离子效应.

研究的目的:

  • 为了研究Ncd-tubulin二极体相互作用,考虑绑定离子效应.
  • 为了比较使用混合溶剂模型与纯隐性溶剂模型的静电计算.
  • 在生物分子模拟中开发一种基于机器学习的方法来处理绑定离子.

主要方法:

  • 多尺度计算方法包括分子动力学模拟.
  • 使用了混合离子治疗-2 (HIT-2) 程序,DelPhi和DelPhiForce.
  • 采用混合溶剂模型,明确处理绑定离子,隐式处理其他离子.

主要成果:

  • 在混合和隐性溶剂模型中,静电计算显著不同.
  • 在充电区域对结合离子的明确处理对于精确的静电分析至关重要.
  • 这项研究强调了结合离子在Ncd-氨酸二极体相互作用中的重要性.

结论:

  • 一个基于机器学习的混合溶剂模型准确地捕捉了带电生物分子的静电特征.
  • 这种方法适用于氨酸-氨酸复合物和其他充电生物分子,如DNA/RNA和病毒蛋白.