Role of the influenza virus heterotrimeric RNA polymerase complex in the initiation of replication.

Journal article

Both transcription and replication of the influenza virus RNA genome are catalysed by a virus-specific RNA polymerase. Recently, an in vitro assay, based on the synthesis of pppApG, for the initiation of replication by recombinant RNA polymerase in the absence of added primer was described. Here, these findings are extended to show that adenosine, AMP and ADP can each substitute for ATP in reactions catalysed by either recombinant ribonucleoprotein or RNA polymerase complexes with either model virion RNA (vRNA) or cRNA promoters. The use of either adenosine or AMP, rather than ATP, provides a convenient, sensitive and easy assay of replication initiation. Moreover, no pppApG was detected when a PB1-PA dimer, rather than the trimeric polymerase, was used to catalyse synthesis, contrasting with a previous report using baculovirus-expressed influenza RNA polymerase. Overall, it is suggested that the heterotrimeric polymerase is essential for the initiation of replication.

Authors: Deng, T; Sharps, J; Brownlee, G

• Publication status: Published
• Journal: Journal of general virology
• Volume: 87
• Issue: Pt 11
• Pages: 3373-3377
• Publication date: 2006-11-01
• DOI: 10.1099/vir.0.82199-0
• EISSN: 1465-2099
• ISSN: 0022-1317
• Language: English
• Keywords: Virus Replication; Recombinant Proteins; RNA, Complementary; Orthomyxoviridae; Protein Subunits; Adenosine Diphosphate; RNA Replicase; DNA-Directed RNA Polymerases; Cell Line; Dimerization; Viral Proteins; Promoter Regions, Genetic; Humans; Ribonucleoproteins; Adenosine; RNA, Viral; Nucleic Acid Conformation; Adenosine Triphosphate