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Protein structure: Immune system foiled by a hairpin
Date:1/22/2013

protein. The analysis revealed that it inserts a hairpin loop into the core secondary structure of MDA5, unfolding the protein and allowing V to bind to a segment that is normally buried in the interior of the molecule. This in turn prevents MDA5 from forming filaments and signaling the presence of viral RNA.

This finding was completely unexpected, and explains why MDA5, but not RIG-I, is inhibited by the V protein: This internal sequence is different in RIG-I and this is the reason why RIG-I is not targeted by the viral product. "Our work provides a detailed insight into the mechanisms viral proteins use to inhibit host protein function. It may also open opportunities for new therapeutic interventions," Hopfner concludes.


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Contact: Luise Dirscherl
dirscherl@lmu.de
49-892-180-2706
Ludwig-Maximilians-Universitt Mnchen
Source:Eurekalert

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