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Fois B, Bianco G, Sonar VP, Distinto S, Maccioni E, Meleddu R, Melis C, Marras L, Pompei R, Floris C, Caboni P, Cottiglia F. Phenylpropenoids from Bupleurum fruticosum as Anti-Human Rhinovirus Species A Selective Capsid Binders. JOURNAL OF NATURAL PRODUCTS 2017; 80:2799-2806. [PMID: 29039946 DOI: 10.1021/acs.jnatprod.7b00648] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The dichloromethane extract of the leaves of Bupleurum fruticosum was found to inhibit the replication of human rhinovirus (HRV) serotypes 14 and 39. Bioassay-guided fractionation led to the isolation of seven phenylpropenol derivatives (3-9), two polyacetylenes (1 and 2), and one monoterpene (10). Compounds 1 and 10 were identified as previously undescribed secondary metabolites after extensive 1D and 2D NMR experiments as well as high-resolution mass spectrometry. Compounds 2, 4, and 5 showed a selective inhibition of viral replication against HRV39 serotype, with 2 and 4 being the most active, with EC50 values of 1.8 ± 0.02 and 2.4 ± 0.04 μM. Mechanism of action studies indicated that 4 behaves not only as a capsid binder, interfering with the early phases of virus replication, but also as a late-phase replication inhibitor. Docking experiments were performed to confirm the ability of the antiviral phenylpropenoids to selectively fit into the hydrophobic pocket of VP1-HRV39.
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Affiliation(s)
- Benedetta Fois
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
| | - Giulia Bianco
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
| | - Vijay P Sonar
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
| | - Simona Distinto
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
| | - Elias Maccioni
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
| | - Rita Meleddu
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
| | - Claudia Melis
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
| | - Luisa Marras
- Department of Biomedical Sciences, University of Cagliari , 09124 Cagliari, Italy
| | - Raffaello Pompei
- Department of Biomedical Sciences, University of Cagliari , 09124 Cagliari, Italy
| | - Costantino Floris
- Dipartimento di Scienze Chimiche, University of Cagliari, Cittadella di Monserrato , 09042 Monserrato, Cagliari, Italy
| | - Pierluigi Caboni
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
| | - Filippo Cottiglia
- Department of Life and Environmental Sciences, University of Cagliari , Via Ospedale 72, 09124 Cagliari, Italy
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