# Viral glycoprotein-mediated entry and antibody-mediated immunity in HIV-1 and SARS-CoV-2 infection

## TL;DR

This paper reviews how viruses like HIV-1 and SARS-CoV-2 use glycoproteins to enter cells and how antibodies can fight these viruses.

## Contribution

The paper provides a comparative review of viral fusion glycoprotein mechanisms and antibody-mediated immunity in HIV-1 and SARS-CoV-2.

## Key findings

- Class 1 viral fusion glycoproteins are essential for viral entry and are key targets for antibodies.
- Antibodies can neutralize viruses and activate the immune system to clear infected cells.
- The review highlights similarities and differences in glycoprotein-mediated entry and antibody responses between HIV-1 and SARS-CoV-2.

## Abstract

Enveloped viruses such as Human Immunodeficiency Virus (HIV-1) and Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) have caused some of the deadliest pandemics in human history. These viruses utilize Class 1 viral fusion glycoproteins to bind their host receptor and subsequently fuse the virus and host cell membranes to mediate entry. Viral fusion glycoproteins are prominent antigens on the surface of virions and are essential for the virus life cycle. Therefore, they are a primary target for the humoral immune system and the basis for the design of vaccines. Antibodies which target viral fusion glycoproteins can neutralize viral infectivity and activate the immune system in several distinct ways. In this review, we compare mechanisms of how class 1 viral fusion glycoproteins mediate viral entry and cover diverse ways in which antibodies targeting these glycoproteins can neutralize viruses and activate the immune system to clear virus-infected cells.