Mapping a Hidden Step in Viral Infection
Researchers in the lab of Valeria Lulla have uncovered how human astroviruses — a common cause of gastroenteritis and an emerging threat in neurological disease — assemble the molecular machinery they need to replicate inside human cells.
The study, published in npj Viruses, provides the most detailed picture yet of how these viruses process their proteins during infection, revealing potential new targets for future antiviral treatments.
Decoding the Virus's "Assembly Instructions"
Like many RNA viruses, astroviruses produce their replication proteins as one long chain, known as a polyprotein. To become functional, this chain must be cut into smaller pieces at precisely the right locations and times.
Using advanced protein mapping approaches, the Lulla lab identified the exact points where these molecular cuts occur in both classical human astrovirus 1 and the neurotropic astrovirus strain MLB2, which has been linked to infections of the nervous system.
The team discovered previously unknown cleavage sites and showed that disrupting these processing events prevents the virus from building the replication complexes required for infection.
Why It Matters
By revealing how astroviruses organise and activate their replication machinery, the work provides fundamental insight into an understudied group of human pathogens.
Importantly, viral protein processing represents an attractive target for antiviral drugs. The findings from the Lulla lab therefore offer a roadmap for developing future therapies aimed at blocking astrovirus infection before it can take hold.