佛洛洛葡萄醇的生物合成
Jihane Achkar1, Mo Xian, Huimin Zhao
1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
Journal of the American Chemical Society
|April 14, 2005
概括
Pseudomonas fluorescens Pf-5 通过使用 phlACBDE 基因集群合成黄醇. 来自该的PhlD酶有效地将马洛尼尔-CoA转化为黄,从而实现可持续的生产.
科学领域:
- 生物化学 生物化学
- 微生物生物技术 微生物生物技术
- 酶催化酶的催化作用
背景情况:
- 醇和其衍生物是有价值的化合物,具有多种应用.
- 罗葡萄衍生物的生物合成途径复杂,通常涉及多个酶.
- 了解微生物合成为可持续生产方法提供了潜力.
研究的目的:
- 鉴定和描述 Pseudomonas fluorescens Pf-5.5 中用于黄醇生物合成的酶.
- 为了研究马洛尼尔-CoA的酶转化为黄醇.
- 探索生物基合成黄和相关化合物的潜力.
主要方法:
- 在大肠杆菌中,phlACBDE集群和个体基因 (phlD) 的基因表达.
- 将PhlD酶净化为同质的方法.
- 酶试验以确定马洛尼尔-CoA转换的动力参数 (Km,kcat).
- 对相关酶的乙酶和脱乙酶活动的分析.
主要成果:
- 在大肠杆菌中,phlACBDE集群的表达导致了大量的花糖合成.
- 单个基因phlD的表达导致了细胞外的黄醇积累.
- 纯化的PhlD酶有效催化了马洛尼尔-CoA的转化为黄醇 (Km = 5.6 μM,kcat = 10 分钟-1).
- 来自phlACB基因的酶表现出乙酶和脱乙酶活动,相互转换黄醇及其乙化形式.
结论:
- PhlD被确定为从马洛尼尔-CoA中催化黄醇的形成的关键酶.
- 这一发现提供了对黄醇生物合成的机制性见解.
- 理工学院提供了开发环保方法的基础,用于从葡萄糖中合成黄和黄.
相关概念视频
Products of the Citric Acid Cycle
The cells of most organisms—including plants and animals—obtain usable energy through aerobic respiration, the oxygen-requiring version of cellular respiration. Aerobic respiration consists of four major stages: glycolysis, pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation. The third major stage, the citric acid cycle, is also known as the Krebs cycle or tricarboxylic acid (TCA) cycle.
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...
Biosynthesis of Lipids
Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...
Production of Antibiotics
Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
Production of Pharmaceuticals
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...


