セレノキソフォトスイッチによるペプチド骨格構成の調節
Yun Huang1, Günther Jahreis, Christian Lücke
1Max-Planck Research Unit for Enzymology of Protein Folding, Weinbergweg 22, D-06120 Halle/Saale, Germany.
Journal of the American Chemical Society
|May 21, 2010
まとめ
研究者らは,紫外線を用いたペプチドの骨格構造の光学制御を可能にする安定したセレノキソペプチドを開発した. これにより,長期にわたる非均衡状態による同位体固有の生化学反応のモニタリングが可能になります.
科学分野:
- バイオケミストリー バイオケミストリー
- 有機化学 オーガニック・ケミストリー
- フォトケミストリー フォトケミストリー
背景:
- 外部信号によるペプチドおよびタンパク質のバイオアクティビティの制御は極めて重要です.
- 脊椎形状のフォトコントロールは,新しい規制メカニズムを提供します.
研究 の 目的:
- テトラペプチドにペプチド結合のセレニウムアナログを導入する.
- 結果となるセレノキソペプチドの光制御能力と安定性を調査する.
- 同位体固有の生化学反応のモニタリングの可能性を評価する.
主な方法:
- ペプチド結合のセレニウムアナログを含むテトラペプチドの合成 (セレノキソペプチド結合).
- セレノキソペプチドを290nm近くの紫外線で照射する.
- 静止状態における cis 含有量の分析.
- 熱再均衡率のモニタリング
主要な成果:
- 驚くほど安定したセレノキソペプチドが得られた.
- 紫外線照射でペプチド鎖のcis含有量の有意な増加を示した.
- 速度定数でゆっくりとした熱再均衡が観察され,長寿の非均衡形状を示しています.
結論:
- セレノキソペプチドは,ペプチド骨格の形状を光制御するための堅牢なプラットフォームを提供します.
- 寿命の長い過渡形状は,生化学反応における同位体特異性の研究を容易にする.
- このアプローチは,バイオ分子機能の外部信号媒介の調節のための新しい可能性を提供します.
関連する概念動画
01:26Protein Modifications in the RER
Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
01:25Protein Folding
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
02:04Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
02:15Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
02:26Preparation and Reactions of Sulfides
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.