Resuscitating mutations in a furin cleavage-deficient mutant of the flavivirus tick-borne encephalitis virus.

Abstract excerpt

Cleavage of the viral surface protein prM by the proprotein convertase furin is a key step in the maturation process of flavivirus particles. A mutant of tick-borne encephalitis virus (TBEV) carrying a deletion mutation within the furin recognition motif of protein prM (changing R-T-R-R to R-T-R) was previously shown to be noninfectious in BHK-21 cells. We now demonstrate how natural selection can overcome this...

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