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Mapping of functional domains on the influenza A virus RNA polymerase PB2 molecule using monoclonal antibodies
1Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
Abstract:
Monoclonal antibodies against the PB2 of A/Puerto Rico/8/34 (A/PR/ 8/34) (H1N1) were prepared in order to define the functional domains of the RNA polymerase of influenza virus. The fifteen monoclonal antibodies that were generated were divided into 4 groups on the basis of ELISA binding to PB2 or its peptide fragments. Six Group I antibodies that bound to the PB2 N-terminal region (amino acids 1-104) did not inhibit transcription by the viral ribonucleoprotein complex. A single Group II antibody recognizing the region of amino acids 206-259 inhibited ApG-primed transcription. Groups III and IV antibodies bound to the C-terminal region of amino acids 660-759. Of these, Group III antibodies inhibited transcription. The present results identify multiple monoclonal antibody binding domains in PB2, two of which, when bound by antibodies, negatively affect viral RNA transcription.
Insights
Researchers generated monoclonal antibodies targeting the PB2 protein of influenza A virus to map its RNA polymerase functional domains. Two antibody binding sites were found to inhibit viral RNA transcription, aiding in understanding polymerase function.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Influenza virus RNA polymerase is crucial for viral replication.
- Understanding the functional domains of the PB2 subunit is key to inhibiting viral transcription.
Purpose of the Study:
- To define functional domains of the influenza virus RNA polymerase PB2 subunit.
- To identify regions of PB2 that negatively regulate viral RNA transcription.
Main Methods:
- Generation of monoclonal antibodies against the PB2 protein of A/Puerto Rico/8/34 (H1N1).
- ELISA binding assays to map antibody binding sites on PB2 and its peptide fragments.
- Assessment of antibody effects on ApG-primed transcription by the viral ribonucleoprotein complex.
Main Results:
- Fifteen monoclonal antibodies were generated and categorized into four groups based on binding.
- Antibodies targeting the N-terminal region (amino acids 1-104) did not inhibit transcription.
- An antibody targeting amino acids 206-259 inhibited ApG-primed transcription.
- Antibodies targeting the C-terminal region (amino acids 660-759) also inhibited transcription.
Conclusions:
- Multiple monoclonal antibody binding domains were identified within the PB2 subunit.
- Two distinct PB2 regions, when bound by specific antibodies, were shown to negatively impact viral RNA transcription.