Journal
FRONTIERS IN MICROBIOLOGY
Volume 13, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2022.868367
Keywords
influenza B; reporter construct; ribonucleoprotein; polymerase activity assay; antiviral screening
Categories
Funding
- DBT Ramalingaswami re-entry fellowship [BT/RLF/Re-entry/02/2015]
- Department of Biotechnology, Government of India
- DST-SERB, Early Career Research [ECR/2017/001896]
- Science and Engineering Research Board, Department of Science and Technology, Government of India
- Scheme for Transformational and Advanced Research in Science , Ministry of Education, Government of India [STARS/APR2019/BS/369/FS, 369]
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The study presents a novel cloning strategy and extensive standardization of the reporter RNP/polymerase activity assay for influenza B virus research. The assay system not only demonstrated the impact of NS1 and PKCD on viral RNA synthesis, but also showed promising results in evaluating antiviral drugs targeting viral RNA synthesis.
The mini-genome reporter assay is a key tool for conducting RNA virus research. However, procedural complications and the lack of adequate literature pose a major challenge in developing these assay systems. Here, we present a novel, yet generic and simple, cloning strategy for the construction of an influenza B virus reporter RNA template and describe an extensive standardization of the reporter RNP/polymerase activity assay for monitoring viral RNA synthesis in an infection-free setting. Using this assay system, we showed for the first time the effect of viral protein NS1 and host protein kinase C delta (PKCD) on influenza B virus RNA synthesis. In addition, the assay system showed promising results in evaluating the efficacy of antiviral drugs targeting viral RNA synthesis and virus propagation. Together, this work offers a detailed protocol for the standardization of the influenza virus minigenome assay and an excellent tool for screening of host factors and antivirals in a fast, user-friendly, and high-throughput manner.
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