Ia分子の機能部位:Aα免疫原性の分子解剖

D Landais, C Waltzinger, B N Beck

Cell

|October 24, 1986

まとめ

研究者らは,免疫反応を決定するAα分子の特定のアミノ酸領域を特定した. これらの発見は,Aアルファアレルの"b-ness"と"k-ness"とその免疫優位性を理解するのに役立ちます.

科学分野:

免疫学免疫学とは
分子生物学は分子生物学である.
遺伝学遺伝学とは

背景:

Ia抗原として知られる多形細胞表面分子は,免疫反応の調節に重要な役割を果たします.
Aアルファ分子はIa抗原の重要な成分であり,その機能部位を理解することは免疫学にとって重要です.
AαkとAαbのような特定のアレルは,免疫認識に影響を与える明確な特徴を示します.

研究の目的:

モノクローン抗体によるAαkおよびAαbアレルの独特の認識パターンに起因する重要なアミノ酸残基を特定する.
アレル特異的なAα分子内の免疫支配領域を調査する.
Ia抗原の免疫認識におけるアレル変異の分子基礎を解明する.

主な方法:

12つのモノクローナル抗体による認識を評価するために,キメリックおよび変異性Aα鎖を発現するL細胞トランスフェクタントを使用しました.
免疫選択されたBリンパ腫変異体からAα鎖のアミノ酸配列を導き出した.
関連する抗体認識パターンは,Aα鎖の特定の多形態残留物と相関しています.

主要な成果:

各モノクローナル抗体による認識に不可欠なAα鎖のポリモルフな残留物の特定の領域を特定した.
特定の単一アミノ酸の差異は,いくつかの場合,アレル特異性のために責任があります.
特定のAアルファ領域がアレル依存の免疫優位性を示すことが観察されました.

結論:

この研究では,Aα分子上の機能的部位を成功裏に局所化し,アレル差異の分子基盤を定義しました.
これらの発見は,Ia抗原の免疫認識のための構造的要件についての洞察を提供します.
これらの多形態的残留物と免疫支配領域を理解することは,免疫応答の調節を理解するために極めて重要です.

さらに関連する動画

11:10

Antibody Binding Specificity for Kappa (Vκ) Light Chain-containing Human (IgM) Antibodies: Polysialic Acid (PSA) Attached to NCAM as a Case Study

Published on: June 29, 2016

08:09

Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope

Published on: March 24, 2017

関連する概念動画

01:10

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...

01:49

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

01:31

Immunoglobulin-like Cell Adhesion Molecules

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...

01:26

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.

01:31

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...

関連する実験動画