関連する実験動画
Updated: May 3, 2026
06:45
Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
Published on: May 26, 2011
14.6K
複合型SMG5-SMG6 PINドメインの形成は,NMDにとって不可欠です
Katharina Kurscheidt1, Sophie Theunissen2,3, Natalia Pasquali4
1Department of Structural Cell Biology, Max Planck Institute of Biochemistry, Martinsried, Germany.
Nature communications
|February 19, 2026
まとめ
無意味な媒介によるmRNA衰退 (NMD) は,SMG5やSMG6.6のようなタンパク質因子を含む. 相互作用により,エンドヌクレアース活性を持つ複合PINドメイン (cPIN) が形成され,これは標的mRNAを分解し,遺伝子発現を調節するために重要である.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- 無意味な媒介によるmRNA分解 (NMD) は,早発停止コドンを含む異常mRNAを分解するための重要な監視経路です.
- NMD内のエンドヌクレアース活性化と調節の正確なメカニズムは,まだ完全に理解されていません.
- 複数のタンパク質因子が協調してNMDを促進しますが,基板分解におけるそれらの特定の役割は調査中です.
研究 の 目的:
- Nonsense-mediated mRNA decay (NMD) のエンドヌクレアース活性における構造的およびメカニズム的基礎を解明する.
- SMG5とSMG6の相互作用が活性エンドヌクレアース複合体の形成における役割を調査する.
- NMDの標的mRNAの効率的な分解の分子説明を提供すること.
主な方法:
- タンパク質の相互作用をモデル化するために構造的予測を利用した.
- エンドヌクレアースの活性を評価するために,バイオケミカル・イン・ビトロ・アッセイを実施した.
- 機能的影響を評価するために,細胞ベースのナンセンス媒介 mRNA 崩壊 (NMD) 分析を実施しました.
主要な成果:
- SMG5とSMG6は,PINドメインを通じて相互作用し,強力なエンドヌクレアース活性を持つ複合インターフェース (cPIN) を形成します.
- 再構成されたSMG5-SMG6cPINヘテロダイマーは高酵素活性を示し,SMG5はSMG6の活性部位と基板結合部位を完了する.
- SMG5-SMG6の相互作用インターフェース,RNA結合,または活性部位に影響する変異は,cPINの活性を著しく低下させ,細胞NMDを損なう.
結論:
- SMG5とSMG6の並列のPINドメインは,NMDに不可欠な高度に活性なエンドヌクレアスを組み立てるために協力します.
- この研究は,SMG5-SMG6複合体がNMD媒介による効率的なmRNA分解をどのように誘導するかを理解するための構造的およびメカニズム的枠組みを提供します.
- この発見は,重要な細胞品質管理経路内のエンドヌクレアースの調節と活性化のための新しいメカニズムを明らかにしています.
関連する概念動画
02:26Conservation of Protein Domains Over Different Proteins
11.8K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
11.8K
01:49Conserved Binding Sites
4.1K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
4.1K
01:18Membrane Domains
6.2K
The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
6.2K
01:43SNAREs and Membrane Fusion
10.4K
Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
10.4K
00:59Mechanisms of Membrane Domain Formation
3.2K
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
Another mechanism for membrane domain formation involves membrane proteins interacting with...
3.2K
01:30Assembly of Signaling Complexes
4.7K
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,...
4.7K