Molecular basis for the binding polyspecificity of an anti‐cholera toxin peptide 3 monoclonal antibody

Molecular basis for the binding polyspecificity of an anti‐cholera toxin peptide 3 monoclonal antibody
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抗霍乱毒素肽3单克隆抗体结合多特异性的分子基础

DOI:
10.1002/jmr.757
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发表时间:
2006
影响因子:
2.7
通讯作者:
Kramer A.
Kramer A.
中科院分区:
生物学4区
文献类型:
--
作者:
Otte L;Knaute T;Schneider-Mergener J;Kramer A.

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据认为,自身免疫性疾病的发生与抗体 (Ab) 和 T 细胞的结合混杂有关,这是一种经常报道但知之甚少的现象。在这里,我们试图解决两个问题:第一,结合混杂是单克隆抗体(mAb)的一般特征吗?第二,多特异性的分子基础是什么?为此,我们研究了抗霍乱毒素肽 3 (CTP3) mAb TE33 的多特异性结合特性。噬菌体展示文库的筛选鉴定出两种与表位无关的肽,它们特异性结合 TE33,其亲和力与野生型表位相似或比野生型表位高 100 倍。取代分析揭示了抗体识别的不同关键残基模式,表明每种肽具有独特的结合模式。对其中一个共有基序的数据库查询和随后的结合研究发现了 45 种与 TE33 结合的肽(源自异源蛋白质)。为了更好地理解所观察到的多特异性的结构基础,我们对与 TE33 复合的新环状表位进行了建模。我们的模型表明该肽和 TE33 之间的相互作用与在野生型表位复合物的 X 射线结构中观察到的相互作用有很大不同。然而,肽的整体结合构象是相似的。总之,我们的结果支持了单克隆抗体一般多特异性潜力的理论。版权所有 © 2005 约翰·威利父子有限公司
The onset of autoimmune diseases is proposed to involve binding promiscuity of antibodies (Abs) and T‐cells, an often reported yet poorly understood phenomenon. Here, we attempt to approach two questions: first, is binding promiscuity a general feature of monoclonal antibodies (mAbs) and second, what is the molecular basis for polyspecificity? To this end, the anti‐cholera toxin peptide 3 (CTP3) mAb TE33 was investigated for polyspecific binding properties. Screening of phage display libraries identified two epitope‐unrelated peptides that specifically bound TE33 with affinities similar to or 100‐fold higher than the wild‐type epitope. Substitutional analyses revealed distinct key residue patterns recognized by the antibody suggesting a unique binding mode for each peptide. A database query with one of the consensus motifs and a subsequent binding study uncovered 45 peptides (derived from heterologous proteins) that bound TE33. To better understand the structural basis of the observed polyspecificity we modeled the new cyclic epitope in complex with TE33. The interactions between this peptide and TE33 suggested by our model are substantially different from the interactions observed in the X‐ray structure of the wild‐type epitope complex. However, the overall binding conformation of the peptides is similar. Together, our results support the theory of a general polyspecific potential of mAbs. Copyright © 2005 John Wiley & Sons, Ltd.
对源自霍乱毒素 B 亚基的合成肽与三种针对该毒素的单克隆抗体之间的复合物进行 NMR 研究。
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