血清白蛋白结合旋域在VH框架III双特异性抗体格式内设计,并作为化学
Ralph Adams1, Callum Joyce1, Mikhail Kuravskiy1
1Early Solutions, UCB Biopharma UK, Slough, United Kingdom.
Frontiers in immunology
|May 30, 2023
概括
研究人员设计了来自牛的小型抗体碎片 (旋域) 来结合血清白蛋白,从而在体内延长它们的寿命. 这种蛋白质工程方法使双重作用疗法,如中和TNFα或IL-17A,具有增强的药理动力学.
科学领域:
- 生物技术是生物技术.
- 蛋白质工程是指蛋白质工程.
- 免疫学 免疫学 免疫学
背景情况:
- 血清白蛋白结合是延长治疗性蛋白质 (如抗体片段和) 半衰期的经过验证的策略.
- 来自牛抗体超长CDRH3的富含氨酸的旋域代表了最小的单链抗体碎片,在蛋白质工程中提供了多样化的应用.
研究的目的:
- 从牛免疫物质开发出新型的旋域,可以结合人类和动物血清白蛋白.
- 为增强药理动力学性质,设计结合这些旋域的双特异抗体片段.
- 探索化学合成的旋域的潜力,用于双作用治疗应用.
主要方法:
- 用菌体显示来隔离从牛免疫源中准人类和动物血清白蛋白的旋域.
- 旋域通过插入到框架III循环中被设计成两种特定的Fab片段.
- 进行了结构性表征,以评估旋域折叠和表位相互作用.
- 通过化学合成,制造出结合IL-17A中和白蛋白结合的双作用分子.
主要成果:
- 工程双特异性Fab片段保留了其正规抗原 (TNFα) 的中和,同时由于结合白蛋白,在体内表现出扩展的药理动力学.
- 结构分析证实了旋域的正确折叠,并揭示了共同的,但非交叉反应的表位.
- 化学合成的蛋白结合旋域表现出双重功能,中和IL-17A,并在单个分子中结合蛋白.
结论:
- 这项研究介绍了一种新的抗体工程平台,利用牛的免疫材料和可访问的发现过程.
- 开发的旋域为创建具有显著改善血清半衰期的蛋白质疗法提供了多功能工具.
- 这些发现为先进的抗体和化学工程策略铺平了道路,以提高治疗疗效.
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