生产一种没有IgE结合或过敏原活性的Ric c3低过敏原
M G B Bartholazzi1, T M Lodi1, E S Mello2
1Universidade Estadual do Norte Fluminense-Darcy Ribeiro - UENF, Centro de Biociências e Biotecnologia - CBB, Laboratório de Química e Função de Proteínas e Peptídeos - LQFPP, Campos dos Goytacazes, RJ, Brasil.
Brazilian journal of biology = Revista brasleira de biologia
|February 29, 2024
概括
研究人员修改了麻豆过敏原Ric c3,以减少其诱发过敏的特性. 由此产生的低过敏性突变蛋白显示出开发新的过敏免疫治疗策略的潜力.
科学领域:
- 生物化学 生物化学
- 免疫学 免疫学 免疫学
- 植物科学 植物科学
背景情况:
- 麻豆 (Ricinus communis L.) 是一种多功能油,有700多种用途,但其过敏原Ric c1和Ric c3可以引起过敏反应.
- 瑞克c3与常见的食物和空气过敏原交叉反应,对多重敏感的人来说是一个重大挑战.
研究的目的:
- 研究特定氨基酸突变对Ricc3蛋白的IgE结合和过敏性潜力的影响.
- 为了在过敏免疫疗法中潜在使用Ric c3的低过敏突变.
主要方法:
- 重组突变蛋白 (mrRic c3) 在大肠杆菌中通过在IgE结合区域用白替换关键的谷氨酸残留物来产生.
- 通过测量免疫小鼠的IgE,IgG1和总IgG水平,以及评估大细胞脱粒化在老鼠中来评估过敏性.
主要成果:
- 与野生类型蛋白质相比,mrRic c3突变体现出明显减少的杆细胞脱粒化.
- 用mrRic c3免疫的小鼠表现出较低水平的特定IgE和IgG1抗体.
- 突变蛋白显示出结构的改变,减少了促炎反应刺激,降低了IgE结合,同时保持了诱导阻断抗体的能力.
结论:
- 在Ric c3中突变特定的氨基酸残留物可以创建一个低过敏的变种.
- 这种低过敏性突变过敏原 (mrRic c3) 对新型过敏免疫疗法 (AIT) 策略的开发具有前景.
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