Abstract
Rinderpest virus belongs to the family of Paramyxoviridae, consisting of non-segmented negative sense RNA viruses. Viral transcription and replication are carried out by the RNA dependent RNA polymerase L protein which functions together with P protein as LāP complex. The exact events triggering the polymerase complex from transcription to replication function is poorly understood. In the present work, an in vitro transcription system has been described with partially purified LāP complex expressed in insect cells and viral genomic RNA. The relative abundance of each species of mRNA synthesized in vitro decreased from the 3ā² end of the genome to the 5ā² end similar to their abundance in virus infected cells. Recombinant LāP complex was unable to synthesize leader RNA suggesting the initiation of transcription from gene start site and not at the 3ā² end of the genome.
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