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一个人类单克隆抗体对多种1型nsLTP过敏原表现出杂乱的结合
Gage O Leighton1, Lars C Pedersen1, Jungki Min1
1Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Durham, NC, USA.
Journal of investigational allergology & clinical immunology
|February 9, 2026
概括
一种新的人类单克隆抗体 (mAb),IGX-3103,对多种1型非特异性脂质转移蛋白 (nsLTP) 显示出交叉反应性. 这一发现表明,少数散乱的抗体可能会在过敏中驱动广泛的nsLTP交叉反应.
科学领域:
- 过敏原免疫疗法免疫疗法
- 免疫学 免疫学 免疫学
- 结构生物学是结构生物学.
背景情况:
- 非特异性脂质转移蛋白 (nsLTP) 是常见的过敏原,引起交叉反应,使过敏诊断和避免策略复杂化.
- 由于抗体的复杂性,使用多克隆血清区分真正的交叉反应和共同敏感化是具有挑战性的.
研究的目的:
- 调查分析人类单克隆抗体 (mAbs) 是否可以区分交叉反应与共同敏感化.
- 描述一个特定的mAb对nsLTPs的结合性质和表位.
主要方法:
- 使用单细胞测序对过敏患者的人类mAbs进行克隆和查.
- 用mAb IGX-3103表达和结晶Ara h 9用于结构分析.
- 使用分子建模,位点定向突变发生和ELISA的亲和性研究.
主要成果:
- 一个人类的IgG4 mAb,IGX-3103,从一种2型极化记忆B细胞中鉴定出来.
- IGX-3103表现出与19种不同的1型nsLTP过敏原和提取物结合.
- 结构分析显示,IGX-3103诱导Ara h 9的结构变化,允许脂结合腔内的疏水性相互作用,并识别保存的表位残留物.
结论:
- 人类mAb IGX-3103对来自不同来源的1型nsLTPs (花粉,水果,种子) 具有广泛的交叉反应.
- 这种乱交的结合支持了这样一个假设,即有限数量的特定mAbs可以解释在nsLTP过敏中观察到的广泛交叉反应.
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