Stepwise assembly and mechanical stability of nsP3 Helical Scaffolds in Chikungunya Virus

nsP3 helical scaffolds in Chikungunya virus assemble via intermediate steps, and the macrodomain provides stability but fractures under tens of piconewtons, regulating HVD positioning.

• Why it matters: The replication complex depends on nsP3 helical scaffolds, yet how these macrostructures form and how their mechanics control higher-order organization remains unclear.
• What they did: Using High-Speed Atomic Force Microscopy and Electron Microscopy, the study tracked nsP3 assembly and domain-specific roles, then tested mechanical stability by applying forces that caused macrodomain fracture.
• The result: Domain interplay links structural cohesion with functional adaptability, promoting higher-order organization of helical scaffolds into honeycomb-like networks in the infected-cell context.

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