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関連する概念動画

Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

43
Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
43
Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

4.5K
Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
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Antigen Processing Pathways01:31

Antigen Processing Pathways

2.5K
MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
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Antibody Actions01:26

Antibody Actions

3.1K
Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
3.1K
Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

7.6K
Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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関連する実験動画

Updated: Feb 22, 2026

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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C3変換によってC3認識を補足する.

Changhao Jia1,2,3,4,5,6, Xiaoke Yang7, Ming-Hui Zhao1,2,3,4,5

  • 1Renal Division, Department of Medicine, Peking University First Hospital, Beijing, P.R. China.

Science advances
|February 20, 2026
PubMed
まとめ
この要約は機械生成です。

コンプリメント活性化に関する構造的な洞察は,鍵となる酵素C4b2aとC3bBbがコンプリメント成分3 (C3) にどのように結合するかを明らかにする. この研究は,古典的経路,レクチン経路,および代替経路における分子機構を明らかにしています.

さらに関連する動画

Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry
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Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry

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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

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関連する実験動画

Last Updated: Feb 22, 2026

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

Published on: July 18, 2017

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Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry
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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

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科学分野:

  • 免疫学 免疫学とは
  • 構造生物学 構造生物学とは
  • バイオケミストリー バイオケミストリー

背景:

  • 補完系は免疫に不可欠であり,その調節不良は様々な病気に関連しています.
  • コンプリメント活性化は,コンプリメント成分3 (C3) に収束する古典的,レクチン,および代替経路を含む.
  • コンバーターゼ複合体によるC3認識の正確なメカニズムは完全に理解されていません.

研究 の 目的:

  • C4b2a変換酵素によるC3認識の構造的根拠を解明する.
  • クラシックとレクチン経路のコンバータゼ成熟中の構造変化を理解するために.
  • C3bBb-プロペルディンの構造的特徴と,代替経路におけるその役割を解明する.

主な方法:

  • クリオ電子顕微鏡 (cryo-EM) を使用して,高解像度構造を決定しました.
  • C4b2a-C3 マイケリス複合体,C4b2ジモゲン状態,C3bBb-プロペルディン-C3複合体の構造が得られました.

主要な成果:

  • C4b2a-C3 マイケリス複合体の構造は,C4b2aがC3.3とどのように関わるかを明らかにしています.
  • C4b2ジモゲンの構造は,コンバータゼの成熟過程で構造の変化を示しています.
  • C3bBb-プロペルディン-C3構造は,独特の基板結合とプロペルディンの安定作用を強調しています.

結論:

  • コンプリメント活性化経路に関する包括的なメカニズム的な洞察を提供します.
  • クラシック,レクチン,および代替経路コンバータゼによるC3分裂の構造的メカニズムを解明する.
  • 補足関連疾患と治療開発の理解のための構造的基盤を提供します.