Influenza is currently a grave concern for governments and well being organisations around the world. The worry may be the potential for extremely virulent bird flu strains, such as H5N1, to create the ability to infect humans easily. New drugs and vaccines to halt the spread of the virus are badly needed. Now one of the tactics used by influenza virus to take over the machinery of infected cells has been laid bare by structural biologists in the European Molecular Biology Laboratory (EMBL) as well as the joint Unit of Virus Host-Cell Interaction of EMBL, the University Joseph Fourier and National Centre for Scientific Study (CNRS), in Grenoble, France. Inside the current issue of Nature Structural and Molecular Biology they publish a high-resolution image of a key protein domain whose function is to let the virus to multiply by hijacking the host cell protein production machinery. The findings open the way for the design of new drugs to combat future influenza pandemics.
Upon infection the influenza virus starts multiplying in the cells of its host. 1 protein that is crucial in this process is the viral polymerase – the enzyme that copies its genetic material and helps to produce more viruses. One component of the polymerase, named PB2, plays a key role in stealing an important tag from host cell RNA molecules to direct the protein production machinery towards the synthesis of viral proteins. Researchers of the groups of Stephen Cusack and Darren Hart at EMBL Grenoble have identified the PB2 domain responsible for binding the tag, produced crystals of it and examined them using the powerful X-ray beams of the European Synchrotron Radiation Facility (ESRF).
“Viruses are masters of cunning when it comes to hijacking the normal functioning of the host cell. The influenza virus steals a password from host messenger RNAs, molecules that carry the instructions for protein production, and uses it to gain access towards the cell’s protein-making machinery for its own purposes,” says Cusack.
The password is actually a short extra piece of RNA, a modified RNA base referred to as a ‘cap’, which must be present in the beginning of all messenger RNAs (mRNAs) to direct the cell’s protein-synthesis machinery towards the starting point. The viral polymerase binds to host cell mRNA via its cap, cuts the cap off and adds it to the beginning of its own mRNA – a process known as ‘cap snatching’. The capped viral mRNA can then be recognised by the host cell machinery allowing viral proteins to be produced, in the expense of host cell proteins.
The atomic resolution image the EMBL scientists generated of a PB2 domain bound to a cap reveals for the initial time the individual amino acids responsible for recognising this special structure. The central interaction is really a sandwich with two PB2 amino acids stacking either side of the cap. Whilst this recognition mechanism is similar to other cap-binding proteins, its structural details are distinct. Collaborators in the Centro Nacional de Biotecnologia in Madrid showed that disruption of the PB2 cap-binding site prevents the influenza virus from replicating.
“These findings suggest that the PB2 cap-binding site is actually a very promising target for anti-influenza drugs,” Hart says. “Our new structural insights will help us design mimics of the cap that would inhibit viral replication and hence minimize the spread of virus and the severity of the infection.”
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Source: Anna-Lynn Wegener
European Molecular Biology Laboratory