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相关概念视频

Type IV Collagen of Basal Lamina01:05

Type IV Collagen of Basal Lamina

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Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen  forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can...
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Extracellular Matrix01:26

Extracellular Matrix

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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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Fibril-associated Collagen01:11

Fibril-associated Collagen

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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
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相关实验视频

Updated: Jul 7, 2025

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo
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一个模型,通过区间间的连续性来分泌原蛋白.

Louis Bunel1, Lancelot Pincet2, Vivek Malhotra3,4,5

  • 1Laboratoire de Physique de l'École normale supérieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005 Paris, France.

Proceedings of the National Academy of Sciences of the United States of America
|December 26, 2023
PubMed
概括

这项研究提出了一种理论模型,用于通过TANGO1-介导的道从内分泌网膜 (ER) 从内分泌网膜 (ER) 导出像公原这样的大型分泌蛋白质. 分子梯度驱动着公原的出口,解释了它的生理分泌率.

关键词:
坦哥1 坦哥1 坦哥1原蛋白是一种原蛋白.进入式拉切特 进入式拉切特在pH梯度的梯度下,这是一种分泌的分泌.

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科学领域:

  • 细胞生物学 细胞生物学
  • 蛋白质分泌 蛋白质分泌
  • 分子机制的分子机制

背景情况:

  • 分泌蛋白从内质网膜 (ER) 通过出口部位 (ERES) 出口.
  • 大型货物,如原蛋白,超过了标准COPII涂层囊泡的容量.
  • 之前的研究表明,TANGO1依赖于组织间道的运输,用于输出原体.

研究的目的:

  • 介绍一个从ER出口大型分泌蛋白的理论模型.
  • 阐明TANGO1促进前原体运输的机制.
  • 解释分子梯度如何影响蛋白质分泌的速度.

主要方法:

  • 蛋白质出口机制的理论建模.
  • 对TANGO1功能和蛋白质与蛋白质相互作用的分析.
  • 计算在公原运输过程中所涉及的力量和速度.

主要成果:

  • TANGO1的内在无序域会诱导缩,将公原吸引到ERES.
  • 分子梯度 (pH,HSP47) 产生力量 (几十个femtonewton).
  • 原从ER中以大约1nm/s的速度推进,与生理速率相匹配.

结论:

  • 拟议的机制,利用分子梯度和TANGO1,充分解释了ER出口的procollagen.
  • 导出ER被确定为限制公原分泌速率的步骤.
  • 该模型支持分子梯度在细胞运输中的生理相关性.