Coronavirus entry: how we arrived at SARS-CoV-2
Open accessAbstract
Because of the COVID-19 pandemic, the novel coronavirus SARS-CoV-2 has risen to shape scientific research during 2020, with its spike (S) protein being a predominant focus. The S protein is likely the most complicated of all viral glycoproteins and is a key factor in immunological responses and virus pathogenesis. It is also the driving force dictating virus entry mechanisms, which are highly 'plastic' for coronaviruses, allowing a plethora of options for different virus variants and strains in different cell types. Here we review coronavirus entry as a foundation for current work on SARS-CoV-2. We focus on the post-receptor binding events and cellular pathways that direct the membrane fusion events necessary for genome delivery, including S proteolytic priming and activation. We also address aspects of the entry process important for virus evolution and therapeutic development.
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The S2' cleavage site activates membrane fusion and creates an internal fusion peptide within the S2 domain.
“The S2' cleavage site plays an important role in the activation of membrane fusion and creates an internal fusion peptide within the S2 domain [19].”
From Waves and variants of SARS-CoV-2: understanding the causes and effect of the COVID-19 catastrophe (2022) · cites this paper as [19]
At the S2' site, type II serine proteases cleave the cell surface and cysteine-type cathepsin protease cleaves intracellularly, indicating multiple activation triggers for efficient SARS-CoV-2 infection.
“In the process of fusion at the S2' site, the type II serine proteases cleave the cell surface, and cysteine-type cathepsin protease is responsible for the intracellular compartment cleavage, which indicates the possibility of the multiple activation triggers set up by the SARS-CoV-2 to infect the cell with critical efficiency [19].”
From Waves and variants of SARS-CoV-2: understanding the causes and effect of the COVID-19 catastrophe (2022) · cites this paper as [19]
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- Authors
- Whittaker, G. R., Daniel, S., & Millet, J. K.
- Affiliations
- Cornell University (US)
- Université de Versailles Saint-Quentin-en-Yvelines (FR)
- Corresponding author
- Whittaker, Gary R
- Venue
- Current Opinion in Virology
- Publisher
- Elsevier BV
- Published
- 2021-04
- Volume
- 47
- Pages
- 113-120
- ISSN
- 1879-6257 (ISSN-L)
- PMC
- PMC7942143
- OpenAlex
- W3134724518
- Cited by
- 67
- References
- 72
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 12 · 2023: 8 · 2022: 20 · 2021: 19
- FWCI
- 1.73
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Current Opinion in Virology (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion, cc-by-nc-nd)
- Funders
- NIH
- Topics
- Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Virus Infections Studies
- Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
- Keywords
- SARS-CoV-2, coronavirus entry, spike protein, membrane fusion, receptor binding, viral glycoproteins, viral evolution, antiviral agents, COVID-19 pandemic
- MeSH terms
- COVID-19, SARS-CoV-2, COVID-19 Drug Treatment, Humans, Signal Transduction, Virus Internalization, Spike Glycoprotein, Coronavirus
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