Journal
VIRUS RESEARCH
Volume 294, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.virusres.2020.198290
Keywords
Glycyrrhizic acid; Amino acid ester; Zika virus; Antiviral activity; Molecular modeling
Categories
Funding
- Russian Foundation for Basic Research [18-53-52004_MNT_a]
- China Medical University, Taiwan [CMU108ASIA-11, CMU108-S-12, CMU108-MF-42]
- Ministry of Science and Technology, Taiwan [MOST107-2923-B-039-001-MY3]
- [AAAA-A20-120012090029-0]
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This study investigated the potential of glycyrrhizic acid derivatives as ZIKV inhibitors, and found that some GL conjugates showed activity against ZIKV, with different compounds having varying inhibitory effects at different stages of viral infection. These findings suggest that compounds 13 and 14 are promising candidates for expanded antiviral studies against ZIKV infection.
Zika virus (ZIKV) is a new pathogenic flavivirus transmitted by mosquitoes Aedes spp. ZIKV infection is accompanied by serious neurological complications and is especially dangerous for pregnant women, in which it can lead to congenital malformations of the fetus and microcephaly in neonates. Currently, there are no licensed vaccines or specific post-infectious therapies for ZIKV infection. This report is devoted to the study of glycyrrhizic acid (GL) derivatives as ZIKV inhibitors. The inhibitory assays on the cytopathic effect (CPE) and viral infectivity of ZIKV in three different human cell lines revealed that the conjugation of GL with amino acids and their esters (methyl, ethyl) is influenced by the antiviral activity of the compounds. GL conjugates with Glu(OMe)-OMe 11, Glu(OH)-OMe 12, Asp(OMe)-OMe 13, TyrOMe 14, LeuOEt 15, and PheOEt 16 with free COOH groups in the triterpene moiety were active against ZIKV. The most active compounds 13 and 14 have IC50 values of 0.23 mu M and 0.09 mu M against low doses (MOI = 0.05) of ZIKV strain PRVABC59, 1.20 mu M and 0.74 mu M against high doses (MOI = 10) of ZIKV strain Natal RGN single-round infectious particles, respectively. The lead compound was 14 with a high selectivity index (SI < 500). Compound 13 showed a higher inhibitory effect on the early stage (entry) of ZIKV replication than compound 14, and was less potent than compound 14 at the post-entry stage, consistent with the docking models. Compounds 13 and 14 also had a strong interaction with the active site pocket of NS5 MTase. Compounds 13 and 14 are recommended for expanded antiviral studies against ZIKV infection.
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