Evidence that virion-associated VP1 of ...



Title Evidence that virion-associated VP1 of avibirnaviruses contains viral RNA sequences
Author(s) Frederick S. B. Kibenge, V. Dhama
Journal Archives of Virology
Date 1997
Volume 142
Issue 6
Start page 1227
End page 1236
Abstract The VP1 encoded by genomic segment B of birnaviruses is generally known to exist as a genome-linked protein (VPg) and as a 'free' polypeptide of 90 kDa in virus particles. The guanylylation activity associated with infectious bursal disease virus (IBDV) was demonstrated by incubating purified virus in presence of [alpha 32P] GTP; optimum activity in the 90 kDa form of VP1 was seen in low salt concentration in the presence of 4 mM magnesium ions over a wide range of incubation temperatures. The IBDV VP1 was shown to lack guanyl transferase activity. Northwestern (RNA-protein) blot analysis of purified virus using a radiolabelled cDNA probe consisting of 3' and 5' ends of genomic segment B indicated that both forms of virion-associated VP1 contained viral RNA sequences of which those linked to VPg corresponded to the two genome segments and those linked to the 90 kDa VP1 were probably a short oligonucleotide of the terminal viral RNA sequences.

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