膜タンパク質環境を模倣する―原生構造に必要な脂質量:インフルエンザS31N M2
Anna K Wright1,2, Joana Paulino1,2, Timothy A Cross1,3,2
1Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida 32306, United States.
Journal of the American Chemical Society
|January 28, 2022
まとめ
高い脂質比はインフルエンザAウイルスのM2タンパク質の原生構造を安定させ,膜タンパク質の研究に不可欠である. この発見は脂質の豊富さを強調しています.
科学分野:
- 構造生物学
- バイオ物理学
- ウイルス学
背景:
- インフルエンザAウイルスのM2タンパク質は,ウイルスの複製に不可欠なホモテトラメリックイオンチャネルです.
- 以前の研究では,S31N M2タンパク質の伝導領域の構造が堆積され,様々な対称性を示した.
- 洗浄剤の環境は,小型の膜タンパク質を研究するのに理想的でないことが多い.
研究 の 目的:
- インフルエンザAウイルスのS31N M2タンパク質のホモテトラメリック構造を調査する.
- M2タンパク質の構造と対称性に対する高脂質対タンパク質比の影響を探求する.
- ネイティブのような膜タンパク質構造を達成するための最適な脂質の豊富さを決定する.
主な方法:
- 固体核磁気共振 (NMR) スペクトロスコーピー (マジック・アングル・スピニングとオリエンテッド・サンプル)
- 液晶脂質二層におけるS31N M2タンパク質の特徴化.
- タンパク質テトラマー:脂質モラー比は1:120から1:240まで変化する.
主要な成果:
- 顕微鏡のデータは,高脂質比でS31N M2の基本的には4倍対称な構造を示しています.
- 観察された構造は,機能的な部位 (His37,Trp41) でわずかな変化がある M2 野生型 (WT) 構造に似ています.
- 脂質の種類に加えて,高脂質は,ネイティブのようなM2タンパク質の構成を安定させるために重要です.
結論:
- 大量の脂質二層は,S31N M2タンパク質の4倍対称構造の安定化に不可欠である.
- この発見は膜タンパク質の構造研究に重大な意味を持ち,サンプル準備の重要性を強調しています.
- 脂質の豊富さと脂質の性質を最適化することは,膜タンパク質スペクトロスコピストがネイティブのような構造を達成し,感度を最大化するために重要です.
さらに関連する動画
22:10Multi-target Parallel Processing Approach for Gene-to-structure Determination of the Influenza Polymerase PB2 Subunit
Published on: June 28, 2013
13.4K
07:31Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
Published on: September 1, 2023
2.6K
関連する概念動画
Leaky Scanning
5.3K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.3K
Asymmetric Lipid Bilayer
8.3K
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
8.3K
Biosynthesis of Lipids
151
Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
151
Membrane Fluidity
159.8K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
159.8K
Fluid Mosaic Model
13.6K
Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
13.6K
Membrane Lipids
28.8K
Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
28.8K
