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© Institut Pasteur
Structure de macromolécules : dimère d'aquométhémoglobine de cheval. Dérivé toxique oxydé de l'hémoglobine, représentant 1 à 2% du total.
Publication : The Journal of biological chemistry

Biochemical characterization of the respiratory syncytial virus N-P complex in solution

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The Journal of biological chemistry - 09 Jan 2019

Esneau C, Raynal B, Roblin P, Brûlé S, Richard CA, Fix J, Eléouët JF, Galloux M

Link to Pubmed [PMID] – 30626736

J. Biol. Chem. 2019 03;294(10):3647-3660

As all the viruses belonging to the order, the nonsegmented negative-strand RNA genome of respiratory syncytial virus (RSV) is encapsidated by the viral nucleoprotein N. N protein polymerizes along the genomic and anti-genomic RNAs during replication. This requires the maintenance of the neosynthesized N protein in a monomeric and RNA-free form by the viral phosphoprotein P that plays the role of a chaperone protein, forming a soluble N-P complex. We have previously demonstrated that residues 1-30 of P specifically bind to N Here, to isolate a stable N-P complex suitable for structural studies, we used the N-terminal peptide of P (P40) to purify truncated forms of the N protein. We show that to purify a stable N-P-like complex, a deletion of the first 30 N-terminal residues of N (N) is required to impair N oligomerization, whereas the presence of a full-length C-arm of N is required to inhibit RNA binding. We generated structural models of the RSV N-P with biophysical approaches, including hydrodynamic measurements and small-angle X-ray scattering (SAXS), coupled with biochemical and functional analyses of human RSV (hRSV) N mutants. These models suggest a strong structural homology between the hRSV and the human metapneumovirus (hMPV) N-P complexes. In both complexes, the P40-binding sites on N appear to be similar, and the C-arm of N provides a high flexibility and a propensity to interact with the N RNA groove. These findings reveal two potential sites to target on N-P for the development of RSV antivirals.

https://www.ncbi.nlm.nih.gov/pubmed/30626736