在大肠杆菌中静止相抗菌的产生
Wei-Sheng Yu1, Ming-Hung Chen1, Chia-Li Ting1
1Department of Chemical Engineering, National Chung Hsing University, Taichung, 402, Taiwan.
Probiotics and antimicrobial proteins
|March 18, 2025
概括
一种新的静止相促进剂,PAtxA,可以在工程Escherichia coli中高效地产生抗微生物 Ω76. 这种方法允许控制 Ω76 表达,这对于开发针对抗卡巴尼姆耐药肠杆菌 (CRE) 的全细胞药物递送系统至关重要.
科学领域:
- 生物技术和合成生物学
- 抗菌研究 抗菌研究
- 分子生物学分子生物学
背景情况:
- 抗微生物 (AMP) 在天生的免疫力中至关重要,具有治疗潜力.
- 耐卡巴胺的肠道细菌 (CRE) 构成了严重的全球健康威胁,需要新的治疗策略.
- 表达AMP的工程大肠杆菌 (大肠杆菌) 提供了一个潜在的全细胞药物递送系统.
研究的目的:
- 用一个严格控制的,静止阶段特异性促进剂 (PAtxA) 来在大肠杆菌中功能表达抗微生物 Ω76.
- 为了有效表达,将细菌生长与 Ω76 生产脱,并探索其作为全细胞药物递送系统的应用.
- 为了比较PAtxA-governed表达式与传统的日志相表达式 (PT7).
主要方法:
- 在PAtxA和PT7促进体的控制下,对 Ω76表达的工程大肠杆菌菌株.
- 培养和监测细菌生长 (OD600) 和细胞形态.
- SDS-PAGE用于蛋白质表达确认和基于溶剂的Ω76.6的提取.
- 抗微生物活性测定针对格拉姆阴性和格拉姆阳性细菌.
主要成果:
- 与PT7驱动的日志相表达相比,PAtxA促进了高水平,静态相特定的 Ω76 生产,导致生物质度更高.
- PT7治理的表达导致了较低的生物质和细胞休眠期,细胞的大小减少.
- 甲醇和乙醇是 Ω76 提取的有效溶剂;提取的表明了对大肠杆菌和B. subtilis的抗菌活性.
- 与pT7-Ω76 (21 ± 3 mg/L) 相比,pTOL03F-Ω76 (PAtxA) 获得了更高的Ω76度 (25 ± 3 mg/L).与pT7-Ω76 (21 ± 3 mg/L) 相比,pTOL03F-Ω76 (PAtxA) 获得了更高的Ω76度 (25 ± 3 mg/L).
结论:
- 该PAtxA促进体使大肠杆菌中高效,可控的生产 Ω76 ,将其与细菌生长脱.
- Ω76的静态相表达与日志相表达相比具有明显的表现特征优势,支持其在全细胞药物递送系统中的使用.
- 这项研究突出了工程化大肠杆菌与静态相促进体的潜力,用于向的抗微生物药物输送和二次代谢物生产.
相关概念视频
Peptidoglycan Synthesis
4.7K
Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
4.7K
Stringent Response in E. coli
528
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
528
Production of Antibiotics
265
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...
265
Production of Pharmaceuticals
94
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...
94


