在微生物中合成多基基的新途径
1Department of Biotechnology, Graduate School of Agriculture and Life Sciences, University of Tokyo, Japan.
Nature
|September 7, 1999
概括
灰色菌的rppA基因编码了一种类似植物石墨烯合成酶的蛋白质. 这种细菌酶合成聚基化物,产生1,3,6,8-四氧化纳,对黑色素和二次代谢物产生至关重要.
科学领域:
- 生物化学 生化学
- 微生物学 微生物学
- 分子生物学分子生物学
背景情况:
- 基合成酶 (CHSs) 是黄类生物合成中的关键植物酶.
- 细菌rppA类基因的功能,尽管与CHSs的序列相似,但仍然没有特征.
研究的目的:
- 为了研究从Streptomyces griseus中获得的rppA基因产物的功能和催化特性.
- 为了确定细菌酶是否具有类似合酶的活性.
主要方法:
- 基因克隆和rppA的蛋白质表达.
- 使用马洛尼尔-协酶-A作为起始分子的酶分析.
- 位点定向突变发生,以确定基本活性位点残留物.
- 在Streptomyces griseus中基因破坏以评估体内功能.
主要成果:
- 这种Streptomyces griseus RppA蛋白质的功能是同分体,催化聚基化合成.
- RppA利用马洛尼尔-协酶-A,进行四次扩展,并产生1,3,6,8-四氧化纳乙烯 (THN).
- 半氨酸残留物对于RppA活动至关重要;rppA的破坏导致白色素 (缺乏黑色素) 的Streptomyces griseus.
- THN是黑色素和其他含纳夫托金的二次代谢物生物合成的中间体.
结论:
- RppA 是一种细菌中与 chalcone synthase 相关的酶,它负责聚基酸合成.
- 这一发现扩大了已知的CHS类酶在植物之外的分布.
- 在Streptomyces中,RppA在黑色素和其他二次代谢物的生物合成中发挥着至关重要的作用.
相关概念视频
Synthetic Biology
Synthetic biology is an interdisciplinary science that involves using principles from disciplines such as engineering, molecular biology, cell biology, and systems biology. It involves remodeling existing organisms from nature or constructing completely new synthetic organisms for applications such as protein or enzyme production, bioremediation, value-added macromolecule production, and the addition of desirable traits to crops, to name a few.
Golden rice
Golden rice is a genetically modified...
Golden rice
Golden rice is a genetically modified...
ATP and Macromolecule Synthesis
Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
Nucleic Acid Structure
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
DNA Structure
DNA has a double-helix structure. The...
Biosynthesis 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,...
Amino 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...
Biosynthesis of Nucleic Acids
Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...


