Correlation between polymerase activity and pathogenicity in two duck H5N1 influenza viruses suggests that the polymerase contributes to pathogenicity.

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

Virology

journal_title

Virology

authors

Leung BW,Chen H,Brownlee GG

doi

10.1016/j.virol.2010.01.036

subject

Has Abstract

pub_date

2010-05-25 00:00:00

pages

96-106

issue

1

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(10)00085-1

journal_volume

401

pub_type

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