エルゴトアルカロイド生物合成におけるオールドイエロー酵素の役割
Johnathan Z Cheng1, Christine M Coyle, Daniel G Panaccione
1Massachusetts Institute of Technology, Department of Chemistry, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Journal of the American Chemical Society
|January 28, 2010
まとめ
糸状真菌は,さまざまな効果を持つエルゴトアルカロイドを生成します. 研究者らは,アスペルギルス・フミガトゥス (Aspergillus fumigatus) にある重要な酵素を特定し,中間物質を減少させ,エルゴトのアルカロイドD環の形成を可能にしました.
科学分野:
- バイオケミストリー バイオケミストリー
- ミコロジー菌類学
- 自然製品合成 自然製品合成
背景:
- エルゴトアルカロイドは,糸状真菌からの薬理学的に重要な二次代謝産物である.
- エルゴト・アルカロイドの完全な生物合成経路は,まだ完全に理解されていません.
- バイオシンセシスの理解は,潜在的な医薬品の応用に極めて重要です.
研究 の 目的:
- エルゴトアルカロイドの生物合成の重要なステップを解明する.
- 経路における特定の還元反応に責任を負う酵素を特定する.
- エルゴトのアルカロイド構造におけるD環の形成を理解するために.
主な方法:
- アスペルギルス・フミガトゥス (アスペルギルス・フミガトゥス) のエルゴト遺伝子群の分析.
- ホモログのオールドイエロー酵素の生化学的特徴.
- 酵素測定法により,基質の特異性と産物形成を決定する.
主要な成果:
- アスペルギルス・フミガトゥス (Aspergillus fumigatus) のオールド・イエロー酵素の同類体が特定されました.
- この酵素は,チャノクラビン-Iアルデヒドのα,β不飽和アルケンの減少を触媒化する.
- 還元産物であるダイヒドロカノクラビンアルデヒドは,分子内循環によるD環形成を促進する.
結論:
- 特定された酵素は,エルゴト・アルカロイド生物合成において重要な役割を果たしています.
- この発見は,エルゴトアルカロイドの構造的枠組み形成の理解を前進させる.
- このステップの解明は,真菌による天然産物合成の洞察を提供します.
関連する概念動画
01:29Drugs Affecting Neurotransmitter Synthesis
Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
01:15Antifungal Agents
Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
01:19Allosteric Proteins-ATCase
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
02:41Lethal Alleles
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
01:18Yellow Fever
Yellow fever is a viral hemorrhagic disease caused by the yellow fever virus (YFV), a member of the Flaviviridae family. It is transmitted primarily by Aedes and Haemagogus mosquitoes in tropical and subtropical regions of Africa and South America. After transmission through a mosquito bite, the virus initially replicates in skin-resident immune cells such as dendritic cells and macrophages. These cells then migrate to the lymph nodes, where viral replication increases, eventually leading to...
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.