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All Journal Indonesian Journal of Biotechnology
Fedric Intan Damai
Research Centre for Genetic Engineering, National Research and Innovation Agency (BRIN), Indonesia; Department of Biotechnology, School of Life Sciences, Indonesian International Institute for Life Sciences
Biochemistry, Genetics & Molecular Biology Immunology & microbiology Materials Science & Nanotechnology

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Foldon fusion of RBD and S1 fragments of SARS‐CoV‐2 to stabilize the structure of subunit protein as a vaccine candidate Gracia Christine Lembong Purwanto; Fedric Intan Damai; Dian Fitria Agustiyanti; Popi Hadi Wisnuwardhani; Alfi Taufik Fathurahman; Yana Rubiyana; Ratna Dwi Ramadani; Muhammad Khairul Lisan Sidqi; Pekik Wiji Prasetyaningrum; Endah Puji Septisetyani; Dadang Supriatna; Ratih Asmana Ningrum; Wien Kusharyoto; Ihsan Tria Pramanda; Andri Wardiana
Indonesian Journal of Biotechnology Vol 28, No 3 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijbiotech.82159

Abstract

The COVID‐19 pandemic threatened public health around the world at the same time as highlighting the urgency of vaccine development. Subunit vaccines are safe and effective vaccine types that utilize parts of viruses to trigger the body’s immune response. Previous research has shown that fusion of the spike protein with the foldon domain (fd) achieved the trimeric form to increase the protein stability of the recombinant subunit protein spike from SARS‐CoV and MERS‐CoV, thus exceeding the immune response in the body. The study aims to observe the expression of RBD‐fd and S1‐fd recombinant proteins from the spike protein of SARS‐CoV‐2 in CHO‐K1 mammalian cells and investigate the binding activity of those proteins with hACE2 receptor, expressed in HEK293T cells using immunofluorescence staining. The plasmids were transiently transfected into the cells, followed by antibiotic selection using G418 as an initial stage to select the positive stable transformants. Protein expression was confirmed by Western blotting and showed an estimated size for monomeric RBD‐fd of 35 kDa and S1‐fd of 55 kDa. However, the trimeric form of the proteins was not observed. In addition, immunofluorescence staining showed the binding activity between the RBD‐fd and S1‐fd proteins and hACE2 expressing cell line, revealing binding and an internalization process.
Co-Authors Alfi Taufik Fathurahman Andri Wardiana Dadang Supriatna Dian Fitria Agustiyanti Endah Puji Septisetyani Gracia Christine Lembong Purwanto Ihsan Tria Pramanda Muhammad Khairul Lisan Sidqi Pekik Wiji Prasetyaningrum Popi Hadi Wisnuwardhani Ratih Asmana Ningrum Ratna Dwi Ramadani Wien Kusharyoto Yana Rubiyana