信号認識 ヒトの粒子依存性シクレトーム
Sarah C Miller1,2, Elena B Tikhonova1, Cristian Camilo Rodríguez-Almonacid1
1Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX, 79430, USA.
Scientific reports
|February 12, 2026
まとめ
ほとんどの人間の分泌タンパク質は,信号認識粒子 (SRP) 経路に依存しています. この研究は,SRP依存型および独立型タンパク質を特定し,タンパク質分泌および品質管理機構に関する新しい洞察を明らかにします.
科学分野:
- 細胞生物学 細胞生物学
- プロテオミクス プロテオミクスは,プロテオミクスの
- 分子機構の仕組みについて
背景:
- 分泌および膜タンパク質は,細胞タンパク質の約30%を占めています.
- タンパク質の輸送は,信号認識粒子 (SRP) に依存した経路または独立した経路で発生します.
- 哺乳類におけるこれらの経路の特定の役割は,大部分が特徴づけられていないままです.
研究 の 目的:
- 哺乳類の細胞におけるSRP依存タンパク質とSRP依存タンパク質を区別する.
- SRP欠乏がタンパク質の豊富性と細胞経路に与える影響を調査する.
- タンパク質の分泌と品質管理に関与する新しいタンパク質と規制ネットワークを特定する.
主な方法:
- 質量スペクトロメトリーは,細胞と条件付き媒体のタンパク質の豊富さを分析するために使用されました.
- 実験は,信号認識粒子 (SRP) の機能が欠陥している条件下で実施されました.
- 生物情報分析を用いて,タンパク質ネットワークと補償経路を特定した.
主要な成果:
- 多くの分泌および細胞タンパク質の豊富さの有意な減少が,SRP欠陥で観察され,人間の分泌体にとってSRP依存性を確認しました.
- 新種のSRP独立タンパク質が特定されました.
- 潜在的補償経路と,分泌/膜タンパク質とそのmRNAの品質管理に関与するタンパク質ネットワークが発見されました.
結論:
- 人間のシクレトームの大部分は,信号認識粒子 (SRP) 経路に依存しています.
- SRPの欠乏はタンパク質の豊富さに影響を及ぼし,補償メカニズムを誘発する.
- 哺乳類の細胞におけるタンパク質分泌の調節と品質管理に関する新しい洞察が得られた.
関連する概念動画
01:19Contact-dependent Signaling
47.6K
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
47.6K
01:16Calmodulin-dependent Signaling
6.3K
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
6.3K
02:26NF-κB-dependent Signaling Pathway
10.1K
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The...
NF-κB-dependent Signaling Mechanism
The...
10.1K
03:37Subatomic Particles
114.0K
Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
114.0K
02:10The Nucleosome Core Particle
14.6K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
14.6K
01:21Frequency-dependent Selection
24.2K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
24.2K