デアミデーションはアミロイドの形成を加速し,アミリン繊維の構造を変化させます
Emily B Dunkelberger1, Lauren E Buchanan, Peter Marek
1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706-1396, United States.
Journal of the American Chemical Society
|June 28, 2012
まとめ
デアミデーションはアミリンアミロイドの形成を加速し,繊維の構造を変化させ,さらなる集積のための種子を形成します. この変異はタンパク質の安定性に影響を及ぼし,同位体ラベル付きIRスペクトロスコーピーで検出できる.
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:
- アスパラジンとグルタミンのデアミデーションは,タンパク質の構造と集積に影響を与える一般的な翻訳後の修正です.
- 2型糖尿病に関与するアミロイド形成には,アミリンなどのタンパク質が関与しています.
- アミロイド繊維に対するデアミデーションの影響に関する構造的研究は,方法論的な課題のために制限されています.
研究 の 目的:
- アミリンアミロイド形成の運動学と構造に対するデアミデーションの影響を調査する.
- 脱アミデーションがアミリンアミロイド繊維の構造的整合性にどのように影響するかを理解するために.
主な方法:
- アミリン・アミロイド形成の動態に対するデアミデーションの効果を調べた.
- サイト固有の同位体ラベリングと二次元赤外線 (2D IR) スペクトロスコーピーを利用しました.
- アミリン繊維の構造モデルを,デアミデーション部位と組み合わせて分析した.
主要な成果:
- デアミデーションは,アミリンアミロイドの形成を加速し,改変されていないアミリンで集積を誘発できる種子を作成します.
- デアミド化アミリンを含む繊維は,βシート含有量が低下し,N端部とC端部の両方に障害がある.
- N端のβシート領域のデアミデーションは,広範な構造的破壊を引き起こすようです.
結論:
- デアミデーションは,アミリン繊維の構造を変化させ,播種能力を維持する翻訳後の改変である.
- イソトープラベル付きIRスペクトロスコピーは,デアミデーションによるサンプル分解とアミロイド繊維の構造変化を監視する方法を提供します.
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