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一个点突变的Ag85B抗原改善了重组细菌的表达,并保护小鼠免受气溶M.结核病挑战

Wen-Ling Hsu¹, Yang Jiao¹, Matthew Hvasta²

¹Department of Biomedical Engineering, University at Buffalo, State University of New York, Buffalo, USA.

|February 3, 2026

概括

一个单一的突变改善了结核病抗原Ag85B的表达,用于疫苗开发. 这种增强的抗原在脂质体疫苗中使用时,可以保护小鼠免受Mycobacterium结核病感染.

科学领域:

生物技术是生物技术.
免疫学免疫学免疫学
微生物学微生物学

背景情况:

结核病 (TB) 仍然是一个重大的全球卫生挑战,需要新的疫苗策略.
针对特定的Mycobacterium结核病抗原的亚单元疫苗,如Ag85B,是有希望的方法.
在大肠杆菌中复合Ag85B的低表达产量阻碍了疫苗的开发.

研究的目的:

提高M.结核病Ag85B抗原的表达产量和稳定性,以开发结核病疫苗.
为了研究特定突变 (D52W) 对Ag85B表达和特征的影响.
为了评估含有修改的Ag85B抗原的脂质体疫苗配方的免疫性和有效性.

主要方法:

利用ThermoMPNN蛋白质结构算法来预测Ag85B中的稳定突变.
在Ag85B中设计了D52W点突变,以改善大肠杆菌的复合表达.
开发了一种结合修改的Ag85B抗原的脂质体疫苗,并评估了其结合性质.
在M.结核病感染的小鼠模型中评估了幽默和细胞免疫反应和保护疗效.

主要成果:

D52W突变显著提高了E. coli中的Ag85B表达产量和储存稳定性.
经过修改的Ag85B (Ag85B-52W) 证明了与脂质体的特定结合,并保持了表面反应性.
用脂质体疫苗Ag85B-52W免疫接种在小鼠中引起了抗原特异性抗体和T细胞反应.
接种疫苗的小鼠在M.结核病挑战后,肺部细菌负担降低.

结论:

一个单点突变,以计算预测为指导,可以大大提高关键结核病抗原的产生.
修改的Ag85B抗原,当在脂质体疫苗中配制时,可以保护小鼠免受M.结核病感染.
这一战略为推进基于Ag85B的复合结核病疫苗候选人提供了可行的途径.

关键词:

在Ag85B上使用.脂质体是一种脂质体.纳米颗粒纳米颗粒这就是为什么TBTBTBTB 结核病疫苗结核病疫苗

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