タイプIマクロファージスキャベンジャー受容体には,アルファヘリカル型およびコラーゲン型の巻き巻きコイルが含まれています
T Kodama1, M Freeman, L Rohrer
1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.
Nature
|February 8, 1990
まとめ
動脈硬化に関与するマクロファージのスキャベンジャー受容体は,独特のトリメア構造を持っています. アルファヘリル状のコイル状のコイルとコラーゲン状のトリプルヘリクスを特徴とする繊維状の茎は,膜タンパク質にとって新しいものです.
科学分野:
- バイオケミストリー バイオケミストリー
- 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:
- マクロファージのスキャベンジャー受容体 (MSR) は,動脈硬化症に関連した膜グリコタンパク質です.
- MSRは,ユニークなリガンド結合特性を持っています.
- MSRの構造を理解することは,動脈硬化症の研究にとって極めて重要です.
研究 の 目的:
- 牛のタイプIスキャベンジャー受容体のトリメア構造を解明する.
- 細胞外ドメインとトランスメブラン領域をつなぐ新しい繊維状の茎の特徴を特定する.
主な方法:
- 補完的なDNA (cDNA) クロニングは,受容体の構造を推論するために使用されました.
- 構造分析は,細胞外ドメイン,繊維状茎,およびトランスメブランドメインに焦点を当てました.
主要な成果:
- 牛のタイプIスキャベンジャー受容体はトリマーを形成する.
- 長い繊維状の茎は,細胞外C端のシステインに富んだドメインと膜外ドメインを結びつける.
- この茎は,アルファヘリル状のコイル状のコイルと,コラーゲン状のトリプルヘリックスで構成されています.
結論:
- 特定された茎構造は,統合膜タンパク質において前例のないものである.
- この構造的発見は,MSRの機能とその動脈硬化における役割に関する新しい洞察を提供します.
- このユニークな構造を標的とした治療戦略を探求するためのさらなる研究が可能です.
関連する概念動画
Receptor-mediated Endocytosis
Overview
Structural Protein Function
Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
Receptor-mediated Endocytosis
Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
Assembly of Signaling Complexes
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Fibril-associated Collagen
Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
Type IV Collagen of Basal Lamina
Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can exist in...
A type IV collagen molecule has six alpha chains which can exist in...


