5M3J

Influenza B polymerase bound to four heptad repeats of serine 5 phosphorylated Pol II CTD

5M3J の概要

• エントリーDOI: 10.2210/pdb5m3j/pdb
• 分子名称: Polymerase acidic protein, RNA-directed RNA polymerase catalytic subunit, Polymerase basic protein 2, ... (6 entities in total)
• 機能のキーワード: influenza b virus rna-dependent rna polymerase, vrna promoter, pol ii serine 5 phosphorylated ctd peptide, viral protein
• 由来する生物種: Influenza B virus (B/Memphis/13/2003); 詳細
• 細胞内の位置: Virion : Q5V8X3
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 274970.18

構造登録者

Lukarska, M.,Pflug, A.,Cusack, S. (登録日: 2016-10-14, 公開日: 2016-12-21, 最終更新日: 2024-01-17)

主引用文献

Lukarska, M.,Fournier, G.,Pflug, A.,Resa-Infante, P.,Reich, S.,Naffakh, N.,Cusack, S.
Structural basis of an essential interaction between influenza polymerase and Pol II CTD.
Nature, 541:117-121, 2017

PubMed Abstract: The heterotrimeric influenza polymerase (FluPol), comprising subunits PA, PB1 and PB2, binds to the conserved 5' and 3' termini (the 'promoter') of each of the eight single-stranded viral RNA (vRNA) genome segments and performs both transcription and replication of vRNA in the infected cell nucleus. To transcribe viral mRNAs, FluPol associates with cellular RNA polymerase II (Pol II), which enables it to take 5'-capped primers from nascent Pol II transcripts. Here we present a co-crystal structure of bat influenza A polymerase bound to a Pol II C-terminal domain (CTD) peptide mimic, which shows two distinct phosphoserine-5 (SeP5)-binding sites in the polymerase PA subunit, accommodating four CTD heptad repeats overall. Mutagenesis of the SeP5-contacting basic residues (PA K289, R454, K635 and R638) weakens CTD repeat binding in vitro without affecting the intrinsic cap-primed (transcription) or unprimed (replication) RNA synthesis activity of recombinant polymerase, whereas in cell-based minigenome assays the same mutations substantially reduce overall polymerase activity. Only recombinant viruses with a single mutation in one of the SeP5-binding sites can be rescued, but these viruses are severely attenuated and genetically unstable. Several previously described mutants that modulate virulence can be rationalized by our results, including a second site mutation (PA(C453R)) that enables the highly attenuated mutant virus (PA(R638A)) to revert to near wild-type infectivity. We conclude that direct binding of FluPol to the SeP5 Pol II CTD is fine-tuned to allow efficient viral transcription and propose that the CTD-binding site on FluPol could be targeted for antiviral drug development.

PubMed: 28002402
DOI: 10.1038/nature20594

実験手法

X-RAY DIFFRACTION (3.5 Å)