Nikhil Prasad Fact checked by:Thailand Medical News Team Jul 08, 2025 7 months, 3 weeks, 4 days, 1 hour, 38 minutes ago
Medical News: Scientists Discover Key Mutation That Strengthens Omicron’s Attack
Researchers from the University of Missouri in the United States have uncovered a critical mutation in the spike protein of the SARS-CoV-2 Omicron variant that makes the virus more effective at invading human cells. This mutation, known as Q954H, is located in a part of the virus called the HR1 domain. This section of the spike protein plays a major role during the moment the virus fuses with human cells to begin infection.
Omicron Spike Mutation Q954H Makes Virus Fusion More Powerful
According to the new study covered in this
Medical News report, the HR1 domain pairs with another section called the HR2 domain to form what scientists refer to as a “fusion core.” This structure works like a spring-loaded mechanism, pulling the virus and human cell membranes together so the virus can slip inside. The newly discovered Q954H mutation enhances how tightly these two parts stick together, making the virus better at entering human cells.
X-ray Imaging Reveals How the Mutation Works
The scientists also achieved a milestone by creating the first X-ray crystal image of the Omicron fusion core. This allowed them to see how the Q954H mutation strengthens the virus. It turns out that the mutation forms two specific types of chemical bonds with nearby amino acids, which help lock the fusion core in place more tightly than in previous variants.
To prove the importance of these chemical bonds, the team created a synthetic version of the protein with one bond removed. This resulted in a weaker fusion core, confirming that the bonds created by the Q954H mutation are essential for the virus’s increased stability and infectivity.
Why This Matters
Understanding how this specific mutation makes the Omicron variant more infectious can help researchers design better treatments and future vaccines. By targeting this strengthened fusion mechanism, scientists may find new ways to block the virus from entering cells. The enhanced fusion stability is one more reason why Omicron has been so successful in spreading and resisting immune responses.
The study findings were published in the peer reviewed journal: ACS Chemical Biology
https://pubs.acs.org/doi/10.1021/acschembio.5c00208
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