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Updated: Jun 7, 2026

Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds
Published on: October 29, 2015
Strategies for antiviral screening targeting early steps of virus infection
1State Key Laboratory of Respiratory Diseases, Guangzhou Institute of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, 510530, China. peng_tao@gibh.ac.cn
Abstract:
Viral infection begins with the entry of the virus into the host target cell and initiates replication. For this reason, the virus entry machinery is an excellent target for antiviral therapeutics. In general, a virus life cycle includes several major steps: cell-surface attachment, entry, replication, assembly, and egress, while some viruses involve another stage called latency. The early steps of the virus life cycle include virus attachment, receptor binding, and entry. These steps involve the initial interactions between a virus and the host cell and thus are major determinants of the tropism of the virus infection, the nature of the virus replication, and the diseases resulting from the infection. Owing to the pathological importance of these early steps in the progress of viral infectious diseases, the development of inhibitors against these steps has been the focus of the pharmaceutical industry. In this review, Herpes Simplex Virus (HSV), Hepatitis C Virus (HCV), and Human Enterovirus 71 (EV71) were used as representatives of enveloped DNA, enveloped RNA, and non-enveloped viruses, respectively. The current mechanistic understanding of their attachment and entry, and the strategies for antagonist screenings are summarized herein.
Insights
Viral entry into host cells is a critical step for infection and a key target for antiviral drugs. This review examines the mechanisms of viral attachment and entry for Herpes Simplex Virus, Hepatitis C Virus, and Enterovirus 71.
Area of Science:
- Virology
- Molecular Biology
- Drug Discovery
Background:
- Viral infection initiates with cell entry and replication, making the virus entry machinery a prime target for antiviral therapeutics.
- The early stages of the viral life cycle, including attachment and entry, dictate tropism, replication, and disease outcomes.
- Understanding these early steps is crucial for developing effective antiviral strategies.
Purpose of the Study:
- To review the mechanistic understanding of viral attachment and entry processes.
- To summarize strategies for antagonist screening targeting viral entry.
- To use Herpes Simplex Virus (HSV), Hepatitis C Virus (HCV), and Human Enterovirus 71 (EV71) as representative examples.
Main Methods:
- Review of current literature on viral entry mechanisms.
- Comparative analysis of enveloped DNA (HSV), enveloped RNA (HCV), and non-enveloped (EV71) viruses.
- Summary of antagonist screening methodologies.
Main Results:
- Detailed mechanistic insights into the attachment and entry processes of HSV, HCV, and EV71.
- Identification of key viral and host factors involved in these early steps.
- Overview of established and emerging strategies for developing entry inhibitors.
Conclusions:
- Viral entry mechanisms are diverse but represent a significant vulnerability for therapeutic intervention.
- Targeting viral attachment and entry is a promising avenue for novel antiviral drug development.
- Further research into these processes will facilitate the design of broad-spectrum antiviral agents.
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