アルファ-リチンプロテアゼのエネルギッシュな風景は,運動的安定性を通して長寿を最適化します
Sheila S Jaswal1, Julie L Sohl, Jonathan H Davis
1Department of Biochemistry and Biophysics, University of California at San Francisco, 94143-0448, USA.
Nature
|January 18, 2002
まとめ
アルファリチクプロテアゼ (alphaLP) の進化は,タンパク質の折りたたみと安定性を分離した. プロ・リージョンは折り畳みを容易にし,変動を減らす安定したネイティブ状態を作り,機能寿命を延長します.
科学分野:
- バイオケミストリー バイオケミストリー
- タンパク質の折りたたみ
- 進化生物学の進化生物学について
背景:
- タンパク質の折り畳みは生物学的活動に不可欠であり,通常は安定したネイティブ状態を生成します.
- アルファリチクプロテアゼ (alphaLP) は,不安定なネイティブ状態で,分離された折り畳みと安定性を表します.
- alphaLPの再折りには,触媒なしで数千年かかるが,その原始状態は運動的に安定している.
研究 の 目的:
- alphaLP.における折り畳みと安定性の進化的解離を調査する.
- プロリージョンがアルファLPの折り畳みと安定性にどのように影響するかを理解する.
- 分離された折り畳み/展開経路がタンパク質のダイナミクスと機能に与える影響を調査する.
主な方法:
- alphaLPの折り畳み風景の比較分析,プロリージョンとプロリージョンなし.
- アルファLPの折りたたみと展開の運動および熱力学的性質の特徴.
- alphaLP.のネイティブ状態における動的変動の評価.
主要な成果:
- プロリージョンは折り畳みの触媒として作用し,熱力学的に不安定なネイティブ状態の形成を可能にします.
- 折りたたみと展開経路の分離により,アルファLPのネイティブ状態における動的変動が軽減されます.
- このダイナミクスの減少は,タンパク質分解の分解を最小限に抑えることで,アルファLPの機能寿命を高めます.
結論:
- アルファLPにおける熱力学的安定性から折り畳みを分離することで,その原始状態の進化的最適化が可能になった.
- 折り畳みやその後の劣化を促進するプロリージョンの役割は,alphaLPのユニークな性質の鍵です.
- alphaLPのネイティブ状態におけるタンパク質のダイナミクスの低下は,その機能的長寿の延長とタンパク質分解に対する耐性を有する.
関連する概念動画
Lytic Cycle of Bacteriophages
Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the lytic replication...
Enzyme Kinetics
Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
Protein Dynamics in Living Cells
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...


