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GP5 and M, the major membrane proteins of porcine reproductive and respiratory syndrome virus (PRRSV), are the driving force for virus budding and a target for antibodies. We studied co-translational processing of GP5 from an European PRRSV-1 strain. Using mass spectrometry, we show that in virus particles of a Lelystad variant, the signal peptide of GP5 was absent due to cleavage between glycine-34...
The disulphide-linked GP2/3/4 spike of equine arteritis virus (EAV) is essential for virus entry. We showed recently that in transfected cells carbohydrates attached adjacent to the signal peptide of GP3 inhibit cleavage. Here we confirm this unique phenomenon in recombinant viruses with disabled glycosylation sites. Surprisingly, the infectivity of EAV containing GP3 with cleaved signal peptide was...
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