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Published on: April 10, 2012
長いタンパク質の折りたたみ:従来のか異常な?
1Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel.
Journal of the American Chemical Society
|October 7, 2008
まとめ
タンパク質の折り畳みは形によって影響を受けます. 長いタンパク質は複雑な経路によって球状のタンパク質よりもゆっくりと折りたたまれます. 新しい測定法である伸縮感触順序は,すべてのタンパク質の形状の折り畳み予測を統一しています.
科学分野:
- タンパク質の折り畳みダイナミクス
- バイオフィジックス 生物物理学
- 構造生物学 構造生物学とは
背景:
- タンパク質の本来の状態のトポロジーは,折りたたみメカニズムと折りたたみ率の予測を支配する.
- トポロジカルな複雑性はよく研究されているが,全体的な形状のようなより単純なタンパク質の特徴は無視されている.
- 伸びたタンパク質の構造は,一般的な球状の形から逸脱する.
研究 の 目的:
- 折りたたみ運動にタンパク質の伸びが与える影響を調査する.
- 延伸度が異なる重複タンパク質を分析する.
- いくつかの長方形のタンパク質で観察された異常な実験的な折りたたみ動力学に対処する.
主な方法:
- 実験的な折り畳み率とシミュレーションデータを活用した.
- 繰り返しタンパク質を用いて,長さを体系的に変化させる.
- 新規の伸縮感受コンタクトオーダー測定法を開発し,適用しました.
主要な成果:
- タンパク質の伸びの増加は,より遅い折り畳み運動と相関しています.
- 伸びたタンパク質は,球状タンパク質トポロジーの測定に基づいた予測からより大きく逸脱する.
- 安定した中間物質を含む複雑な折りたたみ経路が,長方形のタンパク質に現れる.
- 伸縮感の接触順序は,球状タンパク質と重複タンパク質の折りたたみ運動を成功裏に統一します.
結論:
- タンパク質の形状,特に伸びは,折り畳み運動に大きく影響する.
- より複雑な折りたたみ経路が,伸びたタンパク質のより遅い運動を説明する.
- 新規の延伸感のコンタクト順序測定は,トポロジーと形の両方を考慮することによって,折り畳み率の予測を強化します.
関連する概念動画
Protein Folding
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Amyloid Fibrils
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid Fibrils
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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