一个IGHV1-69广泛中和的流感HA干抗体的严格和复杂的序列约束
Qi Wen Teo1,2, Yiquan Wang1, Huibin Lv1,2
1Department of Biochemistry, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA.
bioRxiv : the preprint server for biology
|July 18, 2023
概括
轻链序列对于广泛中和性流感抗体CR9114的关键,它向血凝素 (HA) 干. 这一发现促进了对抗体特异性的理解,用于开发通用流感疫苗.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 结构生物学 结构生物学
背景情况:
- 针对流感血质素 (HA) 干的广泛中和抗体通常利用IGHV1-69基因段.
- 这些抗体表现出多样化的互补性决定区域 (CDR) H3序列,具有有限的光链表位素接触,掩盖了特异性决定因素.
研究的目的:
- 调查IGHV1-69抗体中HA干特异性的序列决定因素.
- 阐明抗体CR9114.4广泛中和活性背后的分子机制.
主要方法:
- 高通量实验以评估抗体功能.
- 突变性研究探讨序列功能关系.
- 结构分析以确定抗体-表皮质相互作用.
主要成果:
- 轻链序列被确定为IGHV1-69抗体CR9114.9的HA干特异性的关键.
- 许多IGHV1-69 HA干抗体CDR H3序列与CR9114不兼容,这表明了特定的序列要求.
- 轻链和CDR H3序列在确定HA干特异性的协调作用被证明.
结论:
- 轻链和CDR H3序列共同决定IGHV1-69抗体中的HA干特异性.
- 这些发现为广泛中和流感抗体反应提供了分子洞察力.
- 这项研究对开发通用流感疫苗有重大影响.
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