MHCクラスI分子と,抗原処理に関連するトランスポーターとの相互作用
W K Suh1, M F Cohen-Doyle, K Fruh
1Department of Biochemistry, University of Toronto, Ontario, Canada.
まとめ
抗原処理に関連するトランスポーター (TAP) は,エンドプラズマ網膜のクラス1分子と結合する. この相互作用は,免疫認識のためのクラス1分子にペプチドの負荷を容易にします.
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.
- 細胞生物学 細胞生物学
背景:
- 抗原処理 (TAP) に関連するトランスポーターは,ペプチドをエンドプラズマの網膜 (ER) に送り込む上で極めて重要です.
- ER内の新生クラス1基因相容性分子は,これらのペプチドに結合し,細胞表面に提示されます.
- 細胞毒性Tリンパ球は,免疫監視のためにこれらのクラス1ペプチド複合体を認識します.
研究 の 目的:
- 抗原処理に関連するトランスポーター (TAP) とクラス1のヒト相容性分子の関連性を調査する.
- ペプチド負荷と免疫応答におけるこの相互作用の機能的影響を理解する.
主な方法:
- TAPとクラス1の分子の免疫降水.
- タンパク質とタンパク質の相互作用の分析 in vitroおよびin vivo.
- 複雑な解離を研究するための生化学的分析.
主要な成果:
- 免疫プレシピテーションにより,TAPと様々なクラス1分子との間の直接的な関連が明らかになった.
- TAPは,優先的にクラス1重鎖のヘテロダイマーとβ2-マイクログローブリンと結合する.
- TAPクラス1複合体は,分子がERからゴルギ装置に移動するにつれて解離した.
- クラス1の結合ペプチドを添加すると,in vitroでTAPクラス1の複合体を解離させました.
結論:
- ERにおけるクラス1分子とTAPの結合は,効率的なペプチド捕獲のための重要なメカニズムです.
- この相互作用は,適切なペプチドがERから脱出する前にクラス1分子にロードされることを確実にします.
- このプロセスは,細胞毒性Tリンパ球による効果的な免疫認識に不可欠です.
関連する概念動画
Mitochondrial Protein Sorting
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Translocation of Proteins into the Mitochondria
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Antigen Presenting Cells
The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
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...
MHC Class I: Presenting Endogenous...
Carrier-Mediated Transport
Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...


