Related Experiment Video
Updated: Jul 1, 2025
High-throughput Antiviral Assays to Screen for Inhibitors of Zika Virus Replication
Published on: October 30, 2021
A Marine Natural Product, Harzianopyridone, as an Anti-ZIKV Agent by Targeting RNA-Dependent RNA Polymerase
Kexin Zhang1,2, Jingyao Liang1,2, Bingzhi Zhang2,3
1School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
Abstract:
The Zika virus (ZIKV) is a mosquito-borne virus that already poses a danger to worldwide human health. Patients infected with ZIKV generally have mild symptoms like a low-grade fever and joint pain. However, severe symptoms can also occur, such as Guillain-Barré syndrome, neuropathy, and myelitis. Pregnant women infected with ZIKV may also cause microcephaly in newborns. To date, we still lack conventional antiviral drugs to treat ZIKV infections. Marine natural products have novel structures and diverse biological activities. They have been discovered to have antibacterial, antiviral, anticancer, and other therapeutic effects. Therefore, marine products are important resources for compounds for innovative medicines. In this study, we identified a marine natural product, harzianopyridone (HAR), that could inhibit ZIKV replication with EC50 values from 0.46 to 2.63 µM while not showing obvious cytotoxicity in multiple cellular models (CC50 > 45 µM). Further, it also reduced the expression of viral proteins and protected cells from viral infection. More importantly, we found that HAR directly bound to the ZIKV RNA-dependent RNA polymerase (RdRp) and suppressed its polymerase activity. Collectively, our findings provide HAR as an option for the development of anti-ZIKV drugs.
Insights
A marine natural product, harzianopyridone (HAR), effectively inhibits Zika virus (ZIKV) replication by targeting its RNA polymerase. This discovery offers a promising new avenue for developing novel antiviral therapies against ZIKV infections.
Area of Science:
- Marine Biology
- Virology
- Drug Discovery
Background:
- Zika virus (ZIKV) poses a significant global health threat, causing mild to severe symptoms and birth defects.
- Current treatments for ZIKV are limited, highlighting the need for new antiviral drugs.
- Marine natural products are a rich source of novel compounds with diverse therapeutic potential.
Purpose of the Study:
- To identify and characterize marine natural products with activity against ZIKV.
- To evaluate the antiviral efficacy and safety of harzianopyridone (HAR) against ZIKV.
- To elucidate the mechanism of action of HAR in inhibiting ZIKV replication.
Main Methods:
- Screening of marine natural products for anti-ZIKV activity.
- In vitro assays to determine EC50 and CC50 values of HAR.
- Western blot analysis to assess viral protein expression.
- Enzyme activity assays to investigate HAR's interaction with ZIKV RNA-dependent RNA polymerase (RdRp).
Main Results:
- Harzianopyridone (HAR) demonstrated potent inhibition of ZIKV replication (EC50: 0.46–2.63 µM) with low cytotoxicity (CC50 > 45 µM).
- HAR significantly reduced viral protein expression and protected cells from ZIKV-induced damage.
- HAR was found to directly bind to ZIKV RdRp, suppressing its polymerase activity.
Conclusions:
- Harzianopyridone (HAR) is a promising marine-derived compound for the development of novel anti-ZIKV therapeutics.
- Targeting ZIKV RdRp with HAR represents a viable strategy for antiviral drug development.
- Further research into HAR and similar marine compounds could lead to effective treatments for ZIKV and other viral diseases.
Related Concept Videos
01:23RNA Interference
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
02:57piRNA - Piwi-interacting RNAs
02:15Experimental RNAi