Immunological and mutational analysis of SARS-CoV-2 structural proteins from Asian countries

Abstract

Introduction: The emergence of a novel coronavirus, SARS-CoV-2, an etiolating agent of coronavirus disease (COVID-19), has become a pandemic of global concern. Considering the huge number of morbidity and mortality worldwide, the World Health Organization, on 11th March 2020, has announced an unprecedented public health crisis. This virus is a member of plus sense RNA viruses that can show a high rate of mutations. The ongoing multiple mutations in the structural proteins of coronavirus drive viral evolution, enabling them to evade the host immunity and rapidly acquire drug resistance against COVID-19. In the present study, we focused mainly on the prevalence of mutations in the four types of structural proteins like S (spike), E (envelope), M (membrane), and N (nucleocapsid) that are required for the assembly of a complete virion particle. Further, we estimated the antigenicity and allergenicity of these structural proteins to design and develop a potentially good candidate vaccine against SARS-CoV-2.
 Methods: In the present in silico study, envelope protein was found highly antigenic followed by nucleocapsid, membrane, and spike protein of SARS-CoV-2.
 Results: Consequently, in this study, we detected 987 mutations from 729 sequences of Asia in October 2020 and compared them with China's 1st Wuhan isolate sequence as a reference. Spike showed the highest mutations with 807 point mutations among the four structural proteins, followed by nucleocapsid with 151 mutations, while envelope showed 19 and membrane only 10 point mutations.
 Conclusion: Taken together, our study revealed, variation occurring in the structural protein of SARS-CoV-2 might be altering their structure and functions, and envelope protein appears to be a promising vaccine candidate to curb coronavirus infections.