Abstract:
:The influenza RNA polymerase is known to be important in pathogenicity and adaptation of avian influenza viruses to mammalian hosts. However, the molecular mechanisms responsible are only partly understood. Here we investigated the role of the polymerase in two different, closely related, H5N1 influenza viruses - a high pathogenic, A/duck/Fujian/01/2002 (FJ) strain and a low pathogenic, A/duck/Guangxi/53/2002 (GX) strain. The polymerase activity of the FJ strain was significantly greater than the GX strain. Experiments with hybrid polymerase constructs - both in vitro and in ribonucleoprotein cell-based assays, suggested that the PA and to a lesser extent the PB2 subunits of the polymerase, were responsible for increased polymerase activity of the high pathogenic strain. However, promoter binding was inversely correlated with polymerase activity implying that excessive promoter binding inhibited polymerase activity by preventing promoter clearance. Overall, we suggest that the influenza polymerase is one of the determinants of pathogenicity of duck H5N1 viruses.
journal_name
Virologyjournal_title
Virologyauthors
Leung BW,Chen H,Brownlee GGdoi
10.1016/j.virol.2010.01.036subject
Has Abstractpub_date
2010-05-25 00:00:00pages
96-106issue
1eissn
0042-6822issn
1096-0341pii
S0042-6822(10)00085-1journal_volume
401pub_type
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