関連する実験動画
Updated: Feb 18, 2026

11:18
Automated Separation of C. elegans Variably Colonized by a Bacterial Pathogen
Published on: March 21, 2014
9.0K
NAIP5によるフラゲリン検出の構造的基礎:病原体の免疫回避を制限する戦略
Jeannette L Tenthorey1, Nicole Haloupek1, José Ramón López-Blanco2
1Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.
まとめ
この研究は,バクテリアのフラゲリンによってフラゲリン-NAIP5-NLRC4炎症体がどのように活性化されるかを明らかにしています. この構造的洞察は,リガンドによるヌクレオチド結合ドメインレウシン豊富なリピート (NLR) タンパク質の活性化により,宿主防衛機構を理解するための基礎を提供します.
科学分野:
- 生まれつきの免疫
- 構造生物学
- 微生物学
背景:
- ヌクレオチド結合ドメインのルシンの豊富なリピート (NLR) タンパク質は,重要な細胞性先天性免疫センサーである.
- リガンドによるNLR活性化の構造的基礎を理解することは,病原体に対する宿主防御に不可欠である.
- NAIP5 (NLRファミリー,アポトーシス阻害タンパク質5) とNLRC4は,バクテリアのフラゲリンと結合すると,炎症体複合体を形成する.
研究 の 目的:
- リガンド誘発のNLR活性化の構造的基礎を決定する.
- フラゲリンがNAIP5-NLRC4炎症体を活性化するメカニズムを解明する.
主な方法:
- クリオ電子顕微鏡 (cryo-EM) を使用して,組み立てられたフラゲリン-NAIP5-NLRC4炎症体の構造を決定した.
- 構造分析はNAIP5ドメインとフラゲリン間の相互作用に焦点を当てた.
主要な成果:
- ~1. 4メガダルトンのフラゲリン-NAIP5-NLRC4炎症体構造が解消されました.
- 6つのNAIP5ドメインが複数の保存されたフラゲリン領域と相互作用することが観察された.
- これらの相互作用は,NAIP5のオープンで活発な構成を誘導し,リガンド結合がNLRを活性化する方法を示しています.
結論:
- 多重リガンド表面の先天的な免疫認識は,NLRの活性化のための重要な戦略です.
- このマルチリガンド認識メカニズムは病原体の進化と免疫逃避を制限する.
- この発見は,NLR媒介の先天性免疫に関する重要な構造的洞察を提供します.
関連する概念動画
Flagella and Motility in Bacteria
3.5K
Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...
3.5K
Mechanism of Filopodia Formation
3.3K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
3.3K
Fimbriae, Pili, and Axial Filaments
2.2K
Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...
2.2K
Chemotaxis in E. coli
1.0K
Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
1.0K
Formation of Lipopolysaccharides
740
Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
740
Immune Surveillance by NK Cells and Phagocytes
8.9K
Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
8.9K

