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Screening of Nanobody Specific for Peanut Major Allergen Ara h 3 by Phage Display
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2019-09-25 , DOI: 10.1021/acs.jafc.9b02388
Feng Chen 1 , Huan Ma 1 , Yuelong Li 1 , Heqiao Wang 1 , Abdus Samad 1 , Jiahui Zhou 1 , Lixia Zhu 1 , Yuzhu Zhang 2 , Jie He 3 , Xiaojiao Fan 1 , Tengchuan Jin 1
Affiliation  

Peanut allergy is a major health problem worldwide. Detection of food allergens is a critical aspect of food safety. The VHH domain of single chain antibody from camelids, also known as nanobody (Nb), showed its advantages in the development of biosensors because of its high stability, small molecular size, and ease of production. However, no nanobody specific to peanut allergens has been developed. In this study, we constructed a library with random triplets (NNK) in its CDR regions of a camel nanobody backbone. We screened the library with peanut allergy Ara h 3 and obtained several candidate nanobodies. One of the promising nanobodies, Nb16 was further biochemical characterization by gel filtration, isothermal titration calorimetry (ITC), cocrystallization, and Western blot in terms of its interaction with Ara h 3. Nb16 specifically binds to peanut major allergen Ara h 3 with a dissociation constant of 400 nM. Furthermore, we obtained the Ara h 3-Nb16 complex crystals. Structure analysis shows the packing mode is completely different between the Ara h 3-Nb16 complex crystal and the native Ara h 3 crystal. Structural determination of Ara h 3-Nb16 will provide the necessary information to understand the allergenicity of this important peanut allergen. The nanobody Nb16 may have application in the development of biosensors for peanut allergen detection.

中文翻译:

噬菌体展示法筛选花生主要过敏原Ara h 3的特异性纳米抗体

花生过敏是全球主要的健康问题。食品过敏原的检测是食品安全的关键方面。来自骆驼科动物的单链抗体的VHH结构域,也称为纳米抗体(Nb),由于其高稳定性,小分子尺寸和易于生产而在生物传感器的开发中显示出其优势。但是,尚未开发出花生过敏原特异的纳米抗体。在这项研究中,我们构建了一个在骆驼纳米抗体骨架的CDR区域中具有随机三胞胎(NNK)的库。我们用花生过敏Ara h 3筛选了该文库,并获得了几种候选纳米抗体。Nb16是有前途的纳米抗体之一,可通过与Ara h 3相互作用的凝胶过滤,等温滴定热法(ITC),共结晶和Western blot进一步生物化学表征。Nb16以400 nM的解离常数特异性结合花生主要过敏原Ara h 3。此外,我们获得了Ara h 3-Nb16复合晶体。结构分析表明,Ara h 3-Nb16复合晶体与天然Ara h 3晶体的堆积方式完全不同。Ara h 3-Nb16的结构测定将提供必要的信息,以了解这种重要的花生过敏原的致敏性。纳米抗体Nb16可能在花生过敏原检测生物传感器的开发中具有应用价值。Ara h 3-Nb16的结构测定将提供必要的信息,以了解这种重要的花生过敏原的致敏性。纳米抗体Nb16可能在花生过敏原检测生物传感器的开发中具有应用价值。Ara h 3-Nb16的结构测定将提供必要的信息,以了解这种重要的花生过敏原的致敏性。纳米抗体Nb16可能在花生过敏原检测生物传感器的开发中具有应用价值。
更新日期:2019-09-26
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