WANITCHANG A, Patarasirin P, Jengarn J, Jongkaewwa. Atypical characteristics of nucleoprotein of pandemic influenza virus H1N1 and their roles in reassortment restriction.. Arch Virol. 2011
Sequence analysis of the nucleoprotein (NP) of swine-origin influenza virus H1N1 (S-OIV) reveals a number of atypical characteristics including an early start codon and a highly conserved, non-aromatic residue at position 313. Using an in vitro viral polymerase reconstitution assay, we found that the polymerase complex containing the NP of S-OIV (NP(S-OIV)) yielded substantially lower activity than those assayed with NP derived from other influenza virus strains. Moreover, alteration of the early start codon or introduction of an aromatic residue at position 313 (V313Y) did not increase but instead exacerbated the poor polymerase activity. Interestingly, when NP(S-OIV) was allowed to compete with that of a mouse-adapted influenza virus (A/PR/8/34) to form progeny virions, only progeny bearing NP(S-OIV) were produced, despite the low polymerase activity associated with NP(S-OIV). Our results indicated that NP(S-OIV) requires both the early start codon and the V313 residue for its optimal function. These characteristics are required for a strong compatibility between the S-OIV polymerase subunits and its indigenous NP over that of other strains, which might explain why productive reassortment between S-OIV and seasonal influenza viruses has yet to occur in nature.
See Also:
Latest articles in those days:
- Nucleic acid detection and genomic sequence analysis of one H5N1 avian influenza virus from wide birds around Qinghai Lake 16 hours ago
- An aggregated dataset of serial morbidity and titer measurements from influenza A virus-infected ferrets 20 hours ago
- Structures of H5N1 influenza polymerase with ANP32B reveal mechanisms of genome replication and host adaptation 4 days ago
- Risk assessment of a highly pathogenic H5N1 influenza virus from mink 4 days ago
- Detection of clade 2.3.4.4b highly pathogenic H5N1 influenza virus in New York City 4 days ago
[Go Top] [Close Window]