Viruses reveal self-folding mechanism
18 Oct 2012
Researchers at Leeds University have identified a crucial stage in the lifecycle of simple viruses.
The Leeds Universtiy team are the first to observe at a single-molecule level how the genetic material that forms the core of a single-strand RNA virus particle packs itself into its outer shell of proteins.
Lead researcher Professor Peter Stockley said their results overturn accepted thinking about the process and could open a chink in the armour of a wide range of viruses.
“If we can target this process, it could lead to a completely new class of anti-virals that would be less likely to create resistant viruses than existing drugs, which tend to target individual proteins,” Professor Stockley said.
A number of important viruses like the common cold and polio have RNA (ribonucleic acid) instead of DNA as their genetic material.
The observations reveal that the viruses’ RNA initially has a much greater volume than the virus particles created after they are packed inside their protein shell.
“We realised that the RNA genome must have to be intricately folded to fit into the final container, just like when you pack to go on holiday and need to fold your clothes to fit into the space in your suitcase,” said co-author Dr Roman Tuma from the University of Leeds’ Faculty of Biological Sciences.
When the team added proteins to the viral RNA they saw an immediate collapse in its volume. “It seems that viral RNAs have evolved a self-folding mechanism that makes closing the ’viral suitcase’ very efficient. It’s as though ’the suitcase and the clothes’ work together to close the lid and protect the content,” Tuma said.
“The viral RNAs, and only the viral RNAs, can do this trick of folding up to fit as soon as they see the ’suitcase’ coming. That’s the important thing. If we can interfere in that process we’ve got a completely novel drug target in the lifecycle of viruses,” Professor Stockley said.
The team used instrumentation custom built at the University that allowed them to make the first ever single-molecule measurements of viral assembly. This allowed researchers to observe individual viral particles one at a time.
“We’re now perfectly positioned to pursue questions about how this mechanism works in other viruses and we’re already thinking about ways to start designing new antiviral drugs that would target this newly recognised feature of viral lifecycles,” Stockley said.
