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Scientists find new way to target norovirus family

Copyright: Norovirus – a highly infectious virus that can cause outbreaks of diarrhoea and vomiting. (C) NCCID

News from: University of Glasgow

Researchers have made a significant break-through in understanding how a family of viruses, including the norovirus, initiate infections.

The new study, published in Nature and led by the University of Glasgow, reveals the inner workings of the calicivirus family, which includes norovirus and sapoviruses – highly infectious viruses that can cause outbreaks of diarrhoea and vomiting.

It is hoped this research may provide a new target for the development of antiviral drugs to prevent diseases like norovirus.

Norovirus is highly contagious and can be very difficult to contain. Commonly outbreaks occur in hospitals, care homes, schools, hotels and on cruise ships. Caliciviruses are also important animal pathogens, causing ‘cat flu’ that can be associated with very high mortality rates in domestic cats.

Using the Nobel prize-winning technique of Cryo-Electron Microscopy (CryoEM) researchers at the Medical Research Council University of Glasgow Centre for Virus Research studied the structure of the virus that causes ‘cat flu’ - feline calicivirus. They made a significant breakthrough in understanding how this family of viruses initiate infections.

They discovered that after binding to the cell surface, these viruses undergo structural changes leading to the formation of a portal – a funnel-shaped structure on the virus particle surface – which is thought to insert into the membrane of the cell, allowing the virus to inject its genome into the host cell and begin the infection process.

This insight into the early stages of calicivirus infection provides a new target for the development of antiviral drugs to prevent this family of viruses.

Dr David Bhella, who led the research, said: “We have made a significant break-through in understanding how this family of viruses initiate infections. When viruses infect us, they bind to and then enter our cells. This is often by a process known as ‘endocytosis’, the process cells use to bring in nutrients from their environment.”

Viruses trigger endocytosis, causing the cell to bring the virus particle into the cell in a bubble or vesicle called an ‘endosome’. The virus then needs to break out of the endosome to release their genes into the cell and start the infection.

The work was funded by the Medical Research Council (MRC) and BBSRC. 

ENDS


Tags: virus human health news University of Glasgow