Oxford scientists unravel how viruses build themselves without a blueprint

New technique captures viral assembly molecule by molecule, revealing trial and error and stable intermediate structures that guide construction

By LineZotpaper

Published22 October 2026

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Researchers at the University of Oxford have directly observed virus-like particles assembling one molecule at a time, uncovering the simple physical rules that allow complex biological structures to form reliably. The findings, published in Nature, could lead to new antiviral drugs, improved vaccines, and a deeper understanding of how life builds itself from basic components.

A team at the University of Oxford has captured the first real-time, molecule-by-molecule view of virus-like particles building themselves, solving a puzzle that has eluded scientists for decades. The findings, published in Nature, reveal that viral self-assembly follows a surprisingly simple set of physical rules, relying on trial and error and stable intermediate structures to guide construction.

'We can now watch what happens molecule by molecule and see the physical rules that make it possible,' said co-lead author Dr. Roi Asor. The researchers used mass photometry, a technique developed at Oxford, to track individual protein building blocks as they joined the growing particle.

The team found that early interactions are weak and easily reversible, allowing proteins to try different arrangements. When enough components connect in the right closed configuration, the structure becomes stable and assembly accelerates. One key milestone is the formation of a pentagonal ring of five proteins, which serves as the first highly stable intermediate.

'The weak interactions give the system room to make mistakes,' Dr. Asor explained. 'Most encounters don't have to be successful: the components can separate and try again.'

Co-first author Dan Loewenthal described the method simply: 'We just take a video!'

The insights could lead to new antiviral drugs that disrupt capsid assembly and to improved virus-like particles for vaccines, according to co-author Dr. Jack Tan. The approach may also illuminate how other biological structures, from cellular components to protein complexes, assemble themselves.

Analysis

Why This Matters

The discovery clarifies a fundamental biological process that has been difficult to observe, potentially accelerating the design of antiviral drugs that disrupt viral assembly.
By revealing the 'checkpoints' in virus construction, the research may enable more stable virus-like particles for use in vaccines and drug delivery.
The Oxford team's approach, combining mass photometry with continuous observation, offers a powerful new tool for studying self-assembly in other biological systems.

Background

Viruses protect their genetic material inside a protein shell called a capsid. For decades, scientists understood the start and end states of capsid assembly but could not watch the process unfold. The University of Oxford team overcame this by studying an engineered virus-like particle made of 60 protein units. They used mass photometry, a technique that measures the mass of individual molecules by the light they scatter, to follow assembly in real time.

Key Perspectives

Researchers: The Oxford team emphasizes that viral self-assembly is not a precise blueprint-driven process but a reliable system balancing trial and error with stable intermediate checkpoints. Co-lead author Professor Philipp Kukura noted that such direct observation changes the understanding from reconstructions and models to a detailed, dynamic picture. Pharmaceutical developers: The molecular checkpoints identified could serve as targets for drugs that block capsid formation, offering a new strategy for antiviral therapy. The same principles could help engineer more effective virus-like particles for vaccines. Critics and skeptics: The study used an engineered virus-like particle, not a pathogenic virus. Further research will be needed to confirm that the same assembly rules apply to real, infectious viruses and that disrupting them can yield viable treatments without harming healthy cells.

What to Watch

Application of the mass photometry technique to other viruses and self-assembling biological complexes.
Early-stage research into molecules that interfere with the identified stable intermediates, potentially leading to new antiviral drug candidates.
Collaborations or licensing deals between Oxford and pharmaceutical companies to develop the approach for vaccine engineering.

Sources

Oxford scientists discover how viruses build themselves without a blueprint · Latest Science News -- ScienceDaily

Checked

9 claims in this story checked against 1 source: 5 supported.

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SupportedOxford scientists have unravelled how viruses build themselves without a blueprint.Latest Science News -- ScienceDaily: “Researchers at the University of Oxford have observed virus-like particles assembling themselves one molecule at a time, uncovering the surprisingly simple rules that allow complex biological structures to form with remarkable reliability.”
Not in the sourcesThe technique provides the first real-time, molecule-by-molecule view of virus-like particle assembly.Latest Science News -- ScienceDaily
Partly supportedThe findings solve a puzzle that has eluded scientists for decades.Latest Science News -- ScienceDaily: “The findings, published in Nature , offer a detailed look at a process that scientists have struggled to observe directly for decades.”
SupportedDr. Roi Asor said, “We can now watch what happens molecule by molecule and see the physical rules that make it possible.”Latest Science News -- ScienceDaily: “We can now watch what happens molecule by molecule and see the physical rules that make it possible.”
SupportedDr. Asor said weak interactions let components make mistakes and separate before trying again.Latest Science News -- ScienceDaily: “The weak interactions give the system room to make mistakes. Most encounters don't have to be successful: the components can separate and try again.”
SupportedDan Loewenthal said, “We just take a video!”Latest Science News -- ScienceDaily: “This method lets us study the assembly process directly, we just take a video!”
Partly supportedMass photometry was used to track individual protein building blocks as they joined the growing particle.Latest Science News -- ScienceDaily: “By combining this technology with a new approach for keeping individual molecules confined and continuously observable, the team could repeatedly measure the mass of a growing particle as additional proteins attached.”
SupportedA pentagonal ring of five proteins is the first highly stable intermediate in assembly.Latest Science News -- ScienceDaily: “One especially important milestone occurs when five larger protein building blocks connect to form a closed pentagonal ring. This is the first highly stable structure in the assembly process.”
Partly supportedDr. Jack Tan said the insights could lead to antiviral drugs that disrupt capsid assembly and improved virus-like particles for vaccines.Latest Science News -- ScienceDaily: “The ability to understand these processes at the molecular level could have important applications in vaccine development and antivirals that disrupt viral assembly.”