コラーゲンの安定性に対する3ヒドロキシプロリン残留物の影響
Cara L Jenkins1, Lynn E Bretscher, Ilia A Guzei
1Contribution from the Department of Chemistry and Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Journal of the American Chemical Society
|June 6, 2003
まとめ
この研究では,3-ヒドロキシ-l-プロリン (3-Hyp) が,4-ヒドロキシ-l-プロリン (4-Hyp) と異なり,コラーゲンのトリプルヘリクスを不安定化することが明らかになりました. コラーゲン配列内のその位置は,タンパク質の安定性に対するこの不安定化効果に大きく影響する.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- バイオフィジックス 生物物理学
背景:
- 繊維状のタンパク質であるコラーゲンは結合組織にとって不可欠であり,アミノ酸の配列を繰り返す三重ヘリキルの構造を特徴としています.
- 4 (((R) -ヒドロキシ-l-プロリン (4-Hyp) はコラーゲンのトリプルヘリックス安定性を高めます.
- コラーゲンの安定性に対する3(S) -ヒドロキシ-l-プロリン (3-Hyp) の影響はほとんど不明です.
研究 の 目的:
- コラーゲンの三重螺旋の安定性に,3-ヒドロキシ-l-プロリン (3-Hyp) の影響を調査する.
- コラーゲン配列内の自然 (Xaa) と非自然 (Yaa) の位置における3-Hypの効果を比較する.
主な方法:
- 2つのホスト・ゲストペプチドの合成で,3-Hypを異なる位置に組み込む.
- これらの合成ペプチドの構造安定性の分析.
主要な成果:
- 3-Hypで合成されたペプチドのどちらも,プロリンと比較して,トリプルヘリクルス安定性が低下したことを示した.
- 自然なXaaの位置にある3-Hypは,鎖間の水素結合を弱めることで軽微な不安定化を引き起こした.
- 不自然なヤア位置の3ヒップは,ピロリジンのリングパッカーとステリック衝突により,著しい不安定化をもたらしました.
結論:
- 3-Hypは,4-Hypと比較してコラーゲンのトリプルヘリックス安定性に明確な効果を持っています.
- 3-Hyp (Xaa vs Yaa) の位置が,コラーゲンの安定性への影響を決定的に決定する.
- 自然のコラーゲン配列は,構造的整合性を維持するために,3-HypのYa位置を回避する可能性が高い.
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