タンパク質原性アミノ酸の紫外線光分解
Brendan Moore1, Kyle Mahoney1, Mei Fei Zeng1
1Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.
Journal of the American Chemical Society
|May 11, 2023
まとめ
紫外線はキラルアミノ酸を分解し,キラル性を破壊し,ヒドロカルボキシル (HOCO) ラジカルを形成する. これらのラジカルが分解され アミノ酸の断片がイミンを形成し 宇宙でアミノ酸を検出するのに役立ちます
科学分野:
- 写真化学
- 天体化学
- スペクトロスコーピー
背景:
- アミノ酸は生命の基本的な構成要素です
- その光化学的振る舞いを理解することは 天体生物学にとって極めて重要です
- 以前の研究はアラニンに焦点を当てていたが,より広範な調査が必要である.
研究 の 目的:
- 中性グリシン,ルシン,プロリン,セリンの紫外線光化学を調査する.
- 光解離の産物とメカニズムを決定する.
- 星間空間でアミノ酸を検出する可能性を評価する.
主な方法:
- パラ水素マトリックス分離スペクトロスコーピー
- 紫外線を213nmで照射する
- フーリエ変換による赤外線スペクトル解析
主要な成果:
- 213 nmの紫外線照射は,アルファ-カルボニルC-C結合の分裂によって,キラルアミノ酸のキラル性を破壊する.
- ハイドロカルボキシル (HOCO) ラジカルが生成され,素早く光解離する.
- アミンラジカルはイミン (メタニミン,3メチルブタン-1-イミン,エタニミン) またはサイクルイミン (1-ピロリン) を形成する.
- フォーマルデヒドはセリン光分解の産物でもある.
結論:
- HOCOの根源生成は,アミノ酸光分解における一般的な現象である.
- アミノ酸の光分解は,アミノラジカルよりもイミンの形成を好みます.
- HOCOとイミンは 星間空間における アミノ酸の潜在的バイオマーカーです
関連する概念動画
Protein Denaturation
4.4K
The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
4.4K
Protein Folding
8.2K
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...
8.2K
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
2.8K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for...
2.8K
The Proteasome
8.8K
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...
8.8K
Amino Acid Catabolism
70
Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
70
UV–Vis Spectroscopy: Molecular Electronic Transitions
1.6K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.6K


