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相关概念视频

Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to...
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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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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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人类P3H1/CRTAP/PPIB三元复合物的原蛋白加工的结构基础.

Wenguo Li1,2, Junjiang Peng2, Deqiang Yao3

  • 1Department of Orthopaedics, Shanghai Key Laboratory of Orthopaedic Implant, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

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概括

了解原蛋白加工机械是治疗像骨质发育不完善 (OI) 这样的疾病的关键. 这项研究揭示了P3H1/CRTAP/PPIB复合体的结构,揭示了其双功能机制和原相互作用部位.

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科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 分子医学是分子医学.

背景情况:

  • 原体的翻译后修改对于组织完整性至关重要.
  • 原蛋白处理中的缺陷会导致诸如骨质生成不完善 (OI) 等疾病.
  • P3H1/CRTAP/PPIB原加工复合物的结构基础仍然难以捉摸.

研究的目的:

  • 阐明P3H1/CRTAP/PPIB复合体的结构组织和机制.
  • 要了解这种复杂的过程是如何处理原的.
  • 提供对原相关疾病分子病理学的见解.

主要方法:

  • 使用冷电子显微镜 (cryo-EM) 来确定P3H1/CRTAP/PPIB复合物的结构.
  • 确定了单独复合物的结构,以及与原蛋白合的复合物.
  • 进行了突变酶和抑制剂研究,以调查复杂的动态.

主要成果:

  • P3H1和PPIB的活性部位形成了一个双功能反应中心,表明合修饰.
  • 确定了多个原结合点,表明了基质相互作用区域.
  • 观察到一种双三元复合体,其平衡对突变和PPIB抑制剂敏感.

结论:

  • 该研究提供了P3H1/CRTAP/PPIB复合物的高分辨率结构,揭示了其作用机制.
  • 这些发现为了解原蛋白加工和OI病原发生提供了结构基础.
  • 确定的双三元复合体及其调节为治疗干预提供了新的途径.