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Antibody Structure

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...

Antibody Structure

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...

Antigens Involved in Adaptive Immunity

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.

Antigen Processing Pathways

Antigen Processing Pathways

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...

T Cell Activation and Clonal Selection

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...

Antibody Structure and Classes

Antibody Structure and Classes

Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.

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Un papel para el péptido en la determinación de la estructura de la clase II del CMH.

S Sadegh-Nasseri¹, R N Germain

¹Lymphocyte Biology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892.

|September 12, 1991

Resumen

Los péptidos son cruciales para la estructura estable de las moléculas de clase II del Complejo Mayor de Histocompatibilidad (MHC). Este estudio muestra que los péptidos específicos estabilizan los dímeros del MHC clase II, influyendo en su conformación y en su unión a largo plazo.

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Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis

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Área de la Ciencia:

Inmunología Inmunología.
Biología Molecular Biología Molecular
Biología Estructural Biología estructural.

Sus antecedentes:

Los linfocitos T reconocen los fragmentos de péptidos presentados por las moléculas del Complejo Mayor de Histocompatibilidad (MHC) de clase I y II.
Si bien el papel del péptido en la estabilidad de la clase I del CMH está establecido, su contribución a la estructura de la clase II del CMH sigue siendo menos comprendida.

Objetivo del estudio:

Investigar el papel del péptido en el plegamiento y la estabilidad de los dimeros de la clase II del CMH.
Para determinar si los péptidos específicos influyen en la conformación de las moléculas MHC clase II.

Principales métodos:

Purificación de las moléculas E alfa k E beta k del CMH clase II.
Exposición a péptidos específicos bajo condiciones de pH variables (pH bajo seguido de neutralización).
Evaluación de la estructura dimérica y la estabilidad de unión al péptido.

Principales resultados:

Las moléculas purificadas de clase II del MHC sin péptidos específicos carecían de una estructura dimérica estable.
La exposición a los péptidos apropiados durante la neutralización promovió una conformación dimérica compacta y estable.
La unión de péptido estable se correlacionó con la estabilización conformacional observada.

Conclusiones:

La unión al péptido es crítica para establecer la estructura dimérica estable y compacta de las moléculas de clase II del MHC.
La formación eficiente de los complejos de péptido-MHC de clase II de larga duración implica la unión de péptido en un ambiente ácido seguida de la estabilización después de la neutralización.