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Complement System01:27

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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

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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...
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Immunoglobulin-like Cell Adhesion Molecules01:31

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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.
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Antigen Processing Pathways01:31

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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.
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Antibody Actions01:26

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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
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Cytotoxic T Cells-mediated Immune Response01:27

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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.
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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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Reconocimiento del C3 del complemento por las C3 convertasas

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
Resumen
Este resumen es generado por máquina.

Los conocimientos estructurales sobre la activación del complemento revelan cómo las enzimas clave C4b2a y C3bBb se unen al componente 3 (C3) del complemento. Este estudio dilucida los mecanismos moleculares en las vías clásica, de lectina y alternativa.

Palabras clave:
C3 del complementoC3 convertasasvías del complementocrio-EMunión de proteínasestructuras molecularesproperdinconformación de proteínasactivación del complemento

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Área de la Ciencia:

  • Inmunología; Biología Estructural; Bioquímica

Sus antecedentes:

  • El sistema del complemento es crucial para la inmunidad, y su desregulación se asocia con diversas enfermedades.
  • La activación del complemento implica las vías clásica, de lectina y alternativa, que convergen en el componente 3 (C3) del complemento.
  • Los mecanismos precisos de reconocimiento de C3 por los complejos convertasa no se comprenden completamente.

Objetivo del estudio:

  • Elucidar la base estructural del reconocimiento de C3 por la convertasa C4b2a.
  • Comprender los cambios conformacionales durante la maduración de la convertasa de la vía clásica y de lectina.
  • Descubrir las características estructurales de C3bBb-properdina y su papel en la vía alternativa.

Principales métodos:

  • Se utilizó la crio-microscopía electrónica (crio-EM) para determinar estructuras de alta resolución.
  • Se obtuvieron estructuras para el complejo de Michaelis C4b2a-C3, los estados del cimógeno C4b2 y el complejo C3bBb-properdina-C3.

Principales resultados:

  • La estructura del complejo de Michaelis C4b2a-C3 revela cómo C4b2a interactúa con C3.
  • Las estructuras del cimógeno C4b2 muestran cambios conformacionales durante la maduración de la convertasa.
  • La estructura C3bBb-properdina-C3 destaca la unión única del sustrato y el papel estabilizador de la properdina.

Conclusiones:

  • Proporciona una visión mecanística integral de las vías de activación del complemento.
  • Elucida los mecanismos estructurales de la escisión de C3 por las convertasas de las vías clásica, de lectina y alternativa.
  • Ofrece una base estructural para comprender las enfermedades relacionadas con el complemento y el desarrollo de terapias.