Identification and Analysis of Unstructured, Linear B-Cell Epitopes in SARS-CoV-2 Virion Proteins for Vaccine Development

Vaccines
Andrés Corral-LugoAntonio J Martin-Galiano

Abstract

The efficacy of SARS-CoV-2 nucleic acid-based vaccines may be limited by proteolysis of the translated product due to anomalous protein folding. This may be the case for vaccines employing linear SARS-CoV-2 B-cell epitopes identified in previous studies since most of them participate in secondary structure formation. In contrast, we have employed a consensus of predictors for epitopic zones plus a structural filter for identifying 20 unstructured B-cell epitope-containing loops (uBCELs) in S, M, and N proteins. Phylogenetic comparison suggests epitope switching with respect to SARS-CoV in some of the identified uBCELs. Such events may be associated with the reported lack of serum cross-protection between the 2003 and 2019 pandemic strains. Incipient variability within a sample of 1639 SARS-CoV-2 isolates was also detected for 10 uBCELs which could cause vaccine failure. Intermediate stages of the putative epitope switch events were observed in bat coronaviruses in which additive mutational processes possibly facilitating evasion of the bat immune system appear to have taken place prior to transfer to humans. While there was some overlap between uBCELs and previously validated SARS-CoV B-cell epitopes, multiple uBCELs had not be...Continue Reading

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Citations

May 4, 2021·Frontiers in Immunology·Michael J McConnell, Antonio J Martín-Galiano
Sep 22, 2021·International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases·Ana M CorreiaJoão P Gomes

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Software Mentioned

SDPpred
PRED
SPSS
Clustal Omega
Phobius
LBEEP
PSI
iLBE
SVMtrip
Mega

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