tetano
Editor, Senior Moderator
Virology
. 2021 Apr 9;559:145-155.
doi: 10.1016/j.virol.2021.04.001. Online ahead of print.
Variations outside the conserved motifs of PB1 catalytic active site may affect replication efficiency of the RNP complex of influenza A virus
Kaitlyn Waters[SUP] 1 [/SUP], Hamilton J Wan[SUP] 2 [/SUP], Lei Han[SUP] 3 [/SUP], Jianli Xue[SUP] 3 [/SUP], Matthew Ykema[SUP] 4 [/SUP], Yizhi J Tao[SUP] 4 [/SUP], Xiu-Feng Wan[SUP] 5 [/SUP]
Affiliations
Abstract
PB1 functions as the catalytic subunit of influenza virus RNA polymerase complex and plays an essential role in viral RNA transcription and replication. To determine plasticity in the PB1 enzymatic site and map catalytically important residues, 658 mutants were constructed, each with one to seven mutations in the enzymatic site of PB1. The polymerase activities of these mutants were quantified using a minigenome assay, and polymerase activity-associated residues were identified using sparse learning. Results showed that polymerase activities are affected by the residues not only within the conserved motifs, but also across the inter-motif regions of PB1, and the latter are primarily located at the base of the palm domain, a region that is conserved in avian PB1 but with high sequence diversity in swine PB1. Our results suggest that mutations outside the PB1 conserved motifs may affect RNA replication and could be associated with influenza virus host adaptation.
Keywords: Enzymatic active site; Machine learning; Minigenome assay; Polymerase activity; Polymerase basic 1.
. 2021 Apr 9;559:145-155.
doi: 10.1016/j.virol.2021.04.001. Online ahead of print.
Variations outside the conserved motifs of PB1 catalytic active site may affect replication efficiency of the RNP complex of influenza A virus
Kaitlyn Waters[SUP] 1 [/SUP], Hamilton J Wan[SUP] 2 [/SUP], Lei Han[SUP] 3 [/SUP], Jianli Xue[SUP] 3 [/SUP], Matthew Ykema[SUP] 4 [/SUP], Yizhi J Tao[SUP] 4 [/SUP], Xiu-Feng Wan[SUP] 5 [/SUP]
Affiliations
- PMID: 33887645
- DOI: 10.1016/j.virol.2021.04.001
Abstract
PB1 functions as the catalytic subunit of influenza virus RNA polymerase complex and plays an essential role in viral RNA transcription and replication. To determine plasticity in the PB1 enzymatic site and map catalytically important residues, 658 mutants were constructed, each with one to seven mutations in the enzymatic site of PB1. The polymerase activities of these mutants were quantified using a minigenome assay, and polymerase activity-associated residues were identified using sparse learning. Results showed that polymerase activities are affected by the residues not only within the conserved motifs, but also across the inter-motif regions of PB1, and the latter are primarily located at the base of the palm domain, a region that is conserved in avian PB1 but with high sequence diversity in swine PB1. Our results suggest that mutations outside the PB1 conserved motifs may affect RNA replication and could be associated with influenza virus host adaptation.
Keywords: Enzymatic active site; Machine learning; Minigenome assay; Polymerase activity; Polymerase basic 1.