计算机辅助设计以提高树米的热稳定性
Rong Teng1, Jin Zhang1, Zhui Tu1
1State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang 330047, China.
Foods (Basel, Switzerland)
|January 8, 2025
概括
计算机辅助设计创造了一个耐热的Rhizomucor miehei脂酶 (RML) 突变体. 这种增强的脂酶显示出更好的热稳定性和催化活性,使其成为食品工业脂肪加工的理想选择.
科学领域:
- 生物技术是生物技术.
- 酶学 是一种酶学.
- 蛋白质工程是指蛋白质工程.
背景情况:
- 脂酶是食品工业中至关重要的生物催化剂.
- 提高脂酶的热稳定性是工业应用的关键.
- 木米脂酶 (RML) 广泛使用,但由于热稳定性而受到限制.
研究的目的:
- 通过计算设计,设计一种更热稳定的Rhizomucor miehei lipase (RML) 变种.
- 为了研究增强热稳定的分子基础.
- 评估工程脂酶适用于食品工业应用,特别是脂肪加工的适用性.
主要方法:
- 使用FoldX和I-Mutant 3.0进行计算蛋白质设计,以预测稳定突变.
- 局部定向的突变发生产生单点突变和三重突变 (N120M/E230I/N264M).
- 突变体的热稳定性,催化活性和分子模拟 (对接和动力学) 的实验性表征.
主要成果:
- 鉴定并通过实验验证了三种关键突变 (E230I,N120M,N264M) 以提高RML稳定性.
- 三重突变N120M/E230I/N264M呈现出10°C更高的最佳温度 (55°C) 和50°C时半衰期增加了十倍 (46到462分钟).
- 坎佛树种子油的催化活性增加了140% (至600U/mg),促进了结构性脂质的产生.
结论:
- 计算机辅助设计对于创建耐热脂酶突变物是有效的.
- 工程设计的RML三重突变体显示了显著改善的热稳定性和催化效率.
- RML N120M/E230I/N264M是食品行业工业脂肪加工的一个有希望的生物催化剂.
相关概念视频
Microbes in Food Production
Microbial fermentation is central to food biotechnology, enhancing flavor, texture, preservation, and stability. Fermentative microorganisms metabolize carbohydrates into organic acids, alcohols, and other metabolites that inhibit spoilage organisms and improve digestibility while contributing distinctive sensory qualities.In baking, amylases naturally present in flour hydrolyze starch into monosaccharides such as glucose, which Saccharomyces cerevisiae ferments anaerobically. Through...
Bioreactor Controls-III
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
Production of Organic Acids
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
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...


