In silico analysis suggests less effective MHC-II presentation of SARS-CoV-2 RBM peptides: Implication for neutralizing antibody responses.

In silico analysis suggests less effective MHC-II presentation of SARS-CoV-2 RBM peptides: Implication for neutralizing antibody responses.
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DOI:
10.1371/journal.pone.0246731
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
Carter H
Carter H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Castro A;Ozturk K;Zanetti M;Carter H

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SARS-CoV-2抗体在感染后两周内产生,但在感染后相对较快地减弱,这引发了人们对抗体反应是否会在再次暴露时提供保护的担忧。在这里,我们重新审视T-B合作,作为有效和持久的中和抗体反应的先决条件,以突变限制的RBM B细胞表位为中心。T-B合作需要由同一个B细胞共同处理B细胞和T细胞表位,并受到MHC-II的限制。我们评估了与SPEKE蛋白受体结合基序(RBM)中突变限制的B细胞表位的中和抗体反应相关的MHC-II限制因素。检查常见的MHC-II等位基因,我们发现这个关键的B细胞表位周围的多肽被预测结合得很差,这表明T-B合作中缺乏MHC-II的支持,影响了普通人群中高效中和抗体的产生。此外,我们发现多种微生物多肽具有RBM交叉反应的潜力,支持先前暴露作为T细胞记忆的可能来源。
SARS-CoV-2 antibodies develop within two weeks of infection, but wane relatively rapidly post-infection, raising concerns about whether antibody responses will provide protection upon re-exposure. Here we revisit T-B cooperation as a prerequisite for effective and durable neutralizing antibody responses centered on a mutationally constrained RBM B cell epitope. T-B cooperation requires co-processing of B and T cell epitopes by the same B cell and is subject to MHC-II restriction. We evaluated MHC-II constraints relevant to the neutralizing antibody response to a mutationally-constrained B cell epitope in the receptor binding motif (RBM) of the spike protein. Examining common MHC-II alleles, we found that peptides surrounding this key B cell epitope are predicted to bind poorly, suggesting a lack MHC-II support in T-B cooperation, impacting generation of high-potency neutralizing antibodies in the general population. Additionally, we found that multiple microbial peptides had potential for RBM cross-reactivity, supporting previous exposures as a possible source of T cell memory.
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