Scientists at the University of Oxford have published findings in Nature describing how virus-like particles construct themselves through a process of molecular self-assembly. The research provides direct observation of viral protein shell formation, a process that has challenged researchers for decades due to the difficulty of capturing fleeting intermediate structures.
The team studied an engineered virus-like particle containing 60 protein units using mass photometry, a technique that measures individual molecules by detecting scattered light. By combining this technology with a method for continuously observing confined molecules, researchers tracked the addition of protein building blocks in real time as particles grew. This approach revealed the step-by-step assembly process with unprecedented detail.
The findings show that viral assembly follows a maze-like pattern where proteins form weak initial connections that can separate if incorrectly arranged, allowing molecules to retry different combinations. As the proteins connect in the correct closed configuration, the resulting structures become increasingly stable. A critical milestone occurs when five protein building blocks form a closed pentagonal ring, creating the first highly stable intermediate. Subsequent assembly stages require fewer additional components and proceed more rapidly.
This trial-and-error mechanism, combined with the stabilization of successful configurations, explains how thousands of possible molecular arrangements consistently produce the correct final structure without external direction or blueprints. Understanding these molecular interactions could enable development of antiviral drugs that disrupt viral protein shell construction and support improved vaccine engineering. The research methodology also offers broader applications for studying self-assembly processes throughout biology, from cellular structures to large protein complexes.
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