酶结合的代谢物的生物化学确定:在enediyne polyketide synthase CalE8上优先积累一个被编程的八基胺
Katherine Belecki1, Craig A Townsend
1Department of Chemistry, The Johns Hopkins University , Remsen 252, 3400 North Charles St., Baltimore, Maryland 21218, United States.
Journal of the American Chemical Society
|September 18, 2013
概括
研究人员开发了温和的化学方法,以释放和分析抗生素生物合成中的酶结合中间体. 这些技术在卡利希胺素生产中确定了一个关键的八基胺前体,进步了对enediyne抗生素组装的理解.
科学领域:
- 生物化学 生物化学
- 有机化学 有机化学
- 分子生物学分子生物学
背景情况:
- 埃尼迪恩抗生素,像卡利希胺素一样,是强大的抗瘤剂.
- 它们复杂的多基基核结构的生物合成仍然不太了解.
- 阐明这些途径需要研究酶结合中间体的方法.
研究的目的:
- 开发适用于温和化学物质释放和分析与载体蛋白 (CP) 结合的中间体的广泛应用的技术.
- 将这些技术应用于参与卡利希胺素生物合成的CalE8多基合成酶 (PKS).
- 识别enediyne PKS路径中的关键中间体,并了解它们的处理.
主要方法:
- 开发用于释放CP-bound中间体的温和化学方法.
- 这些方法应用于CalE8 PKS.
- 释放的多基基介质的分析.
- 准备完全卸载的CalE8用于复制的活性研究.
主要成果:
- 在一个enediyne PKS (CalE8) 上明确识别酶结合的多基化物 (CalE8).
- 证明PKS结合的八基胺中间体的优先积累.
- 通过CalE8.8进行编程处理控制的证据.
- 准备完全卸载的CalE8用于复制的研究.
结论:
- 开发的技术为基于CP的生物合成途径提供了以前无法获得的酶结合中间体.
- 已识别的八基胺可能是calichamicin的enediyne核心的关键前体.
- 这些发现促进了对抗生素生物合成和PKS机制的理解.
相关概念视频
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,...
01:24Biosynthesis in Bacteria
Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
01:13Induced-fit Model
Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical characteristics of...
01:29Amino Acid Biosynthetic Pathways
Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...