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Significant Broad-Spectrum Antiviral Activity of Bi121 against Different Variants of SARS-CoV-2

Subhadra, B and Agrawal, R and Pal, VK and Chenine, A-L and Mattathil, JG and Singh, A (2023) Significant Broad-Spectrum Antiviral Activity of Bi121 against Different Variants of SARS-CoV-2. In: Viruses, 15 (6).

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Official URL: https://doi.org/10.3390/v15061299


Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has so far infected 762 million people with over 6.9 million deaths worldwide. Broad-spectrum viral inhibitors that block the initial stages of infection by reducing virus binding and proliferation, thereby reducing disease severities, are still an unmet global medical need. We studied Bi121, which is a standardized polyphenolic-rich compound isolated from Pelargonium sidoides, against recombinant vesicular stomatitis virus (rVSV)-pseudotyped SARS-CoV-2S (mutations in the spike protein) of six different variants of SARS-CoV-2. Bi121 was effective at neutralizing all six rVSV-ΔG-SARS-CoV-2S variants. The antiviral activity of Bi121 was also assessed against SARS-CoV-2 variants (USA WA1/2020, Hongkong/VM20001061/2020, B.1.167.2 (Delta), and Omicron) in Vero cells and HEK-ACE2 cell lines using RT-qPCR and plaque assays. Bi121 showed significant antiviral activity against all the four SARS-CoV-2 variants tested, suggesting a broad-spectrum activity. Bi121 fractions generated using HPLC showed antiviral activity in three fractions out of eight against SARS-CoV-2. The dominant compound identified in all three fractions using LC/MS/MS analysis was Neoilludin B. In silico structural modeling studies with Neoilludin B showed that it has a novel RNA-intercalating activity toward RNA viruses. In silico findings and the antiviral activity of this compound against several SARS-CoV-2 variants support further evaluation as a potential treatment of COVID-19

Item Type: Journal Article
Publication: Viruses
Publisher: MDPI
Additional Information: The copyright for this article belongs to the authors.
Keywords: antiviral; Bi121; COVID-19; intercalating agent; Neoilludin B; Pelargonium sidoides; SARS-CoV-2.
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 25 Jul 2023 04:59
Last Modified: 25 Jul 2023 04:59
URI: https://eprints.iisc.ac.in/id/eprint/82589

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