Porphyrin-derived carbon dots for an enhanced antiviral activity targeting the CTD of SARS-CoV-2 nucleocapsid
Background
Since effective antiviral drugs for COVID-19 are still limited in number, the exploration of compounds that haveantiviral activityagainst SARS-CoV-2 is in high demand.Porphyrinis potentially developed as a COVID-19 antiviral drug. However, its low solubility in water restricts its clinical application. Reconstruction of porphyrin intocarbon dotsis expected to possess better solubility and bioavailability as well as lower biotoxicity.
Methods and results
In this study, we investigated theantiviral activityof porphyrin and porphyrin-derived carbon dots against SARS-CoV-2. Through thein silicoanalysis and assessment using a novel drug screening platform, namely dimer-based screening system, we demonstrated the capability of the antivirus candidates in inhibiting the dimerization of the C-terminal domain of SARS-CoV-2Nucleocapsid. It was shown that porphyrin-derived carbon dots possessed lower cytotoxicity on Vero E6 cells than porphyrin. Furthermore, we also assessed their antiviral activity on the SARS-CoV-2-infected Vero E6 cells. The transformation of porphyrin into carbon dots substantially augmented its performance in disrupting SARS-CoV-2 propagation in vitro.
Conclusions
Therefore, this study comprehensively demonstrated the potential of porphyrin-derived carbon dots to be developed further as a promisingly safe and effective COVID-19 antiviral drug.