In Silico Design of a Trans‐Amplifying RNA‐Based Vaccine against SARS‐CoV‐2 Structural Proteins

Nucleic acid‐based vaccines allow scalable, rapid, and cell‐free vaccine production in response to an emerging disease such as the current COVID‐19 pandemic. Here, we objected to the design of a multiepitope mRNA vaccine against the structural proteins of SARS‐CoV‐2. Through an immunoinformatic appr...

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Bibliographic Details
Published in:Advances in virology 2024-09, Vol.2024 (1)
Main Authors: Nafian, Fatemeh, Soleymani, Ghazal, Pourmanouchehri, Zahra, Kiyanjam, Mahnaz, Nafian, Simin, Mohammadi, Sayed Mohammad, Jeyroudi, Hanie, Berenji Jalaei, Sharareh, Sabzpoushan, Fatemeh
Format: Article
Language:English
Subjects:
Antibodies
Antigen presentation
Antigens
COVID-19
COVID-19 vaccines
Dendritic cells
Epitopes
Immunity (Disease)
Immunogenicity
Immunological memory
Lymphocytes T
Macrophages
Memory cells
mRNA
N-Terminus
Nucleocapsids
Nucleotide sequence
Proteins
Replicase
Severe acute respiratory syndrome coronavirus 2
Structural proteins
TLR2 protein
Toll-like receptors
Vaccines
Viruses
γ-Interferon
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Summary:Nucleic acid‐based vaccines allow scalable, rapid, and cell‐free vaccine production in response to an emerging disease such as the current COVID‐19 pandemic. Here, we objected to the design of a multiepitope mRNA vaccine against the structural proteins of SARS‐CoV‐2. Through an immunoinformatic approach, promising epitopes were predicted for the spike (S), envelope (E), membrane (M), and nucleocapsid (N) proteins. Fragments rich in overlapping epitopes were selected based on binding affinities with HLA classes I and II for the specific presentation to B and T lymphocytes. Two constructs were designed by fusing the fragments in different arrangements via GG linkers. Construct 1 showed better structural properties and interactions with toll‐like receptor 2 (TLR‐2), TLR‐3, and TLR‐4 during molecular docking and dynamic simulation. A 50S ribosomal L7/L12 adjuvant was added to its N‐terminus to improve stability and immunogenicity. The final RNA sequence was used to design a trans‐amplifying RNA (taRNA) vaccine in a split‐vector system. It consists of two molecules: a nonreplicating RNA encoding a trans‐acting replicase to amplify the second one, a trans‐replicon (TR) RNA encoding the vaccine protein. Overall, the immune response simulation detected that activated B and T lymphocytes and increased memory cell formation. Macrophages and dendritic cells proliferated continuously, and IFN‐ γ and cytokines like IL‐2 were released highly.
ISSN:1687-8639
1687-8647
DOI:10.1155/2024/3418062