まとめ
ソマティック多様化により,IgGの免疫グロブリン変数領域は,IgM抗体がフォスフォリルコリンに反応するより多様化することがあります. これは,抗体多様性のための生殖系遺伝子を超えるメカニズムを示唆しています.
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:
- 抗体変数領域 (VHとVL) は,抗原特異性を決定する.
- リン酸ホリンは,抗体によって認識される一般的な抗原です.
- ゲルムラインの遺伝子セグメントは,抗体V領域の多様性の基礎です.
研究 の 目的:
- ハイブリドームタンパク質からフォスフォリルコリンを結合する変数領域のアミノ酸配列を分析する.
- フォスフォリクロリン反応におけるVH領域の多様性を調査する.
- IgGとIgMの抗体V領域の変動を比較する.
主な方法:
- N端の免疫グロブリン重鎖と軽鎖の変数領域 (VHとVL) のアミノ酸配列解析.
- ハイブリドームタンパク質から9つのVH領域の完全な配列解析.
- 異なった抗体同型 (IgGとIgM) の間の配列変動の比較.
主要な成果:
- 16のハイブリドームタンパク質の分析により,フォスフォリルコリンと結合し,広範なVHとVLの配列が明らかになった.
- フォスフォリクロリン反応に関与するVH領域の数は,直接的な生殖系遺伝子エンコーディングを上回るようです.
- IgG抗体V領域は,IgM同位体よりも著しく大きな変動性を表しています.
結論:
- 発見は,体多様化メカニズムが抗体V領域の多様性に寄与することを示唆しています.
- このメカニズムは,フォスフォリクロリン反応の際に,IgG抗体とIgM抗体との比較で,より大きな多様性を生み出す可能性があります.
- この研究は,生殖系遺伝を超えた抗体レパートリー生成の潜在的な複雑性を強調しています.
関連する概念動画
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...
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...
Affinity and Avidity
Overview
Transcytosis of IgG
Transcytosis is the process in which molecules are internalized by endocytosis, transported across the cell, and released through exocytosis from the opposite end of the cell. Molecules such as insulin, immunoglobulins, and certain nutrients are transferred through the recycling endosomes by recycling and transcytosis.
IgG molecules from a mother undergo transcytosis starting around 13 weeks of gestation. The amount of IgG transferred and entering the fetal blood circulation increases with...
IgG molecules from a mother undergo transcytosis starting around 13 weeks of gestation. The amount of IgG transferred and entering the fetal blood circulation increases with...
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...
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Diversity of Antigen Receptors
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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.
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.


