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Further studies on hepatitis C virus NS5A-SH3 domain interactions: identification of residues critical for binding and implications for viral RNA replication and modulation of cell signalling

MacDonald, A., Mazaleyrat, S., McCormick, C., Street, A., Burgoyne, N.J., Jackson, R.M., Cazeaux, V., Shelton, H., Saksela, K. and Harris, M. (2005) Further studies on hepatitis C virus NS5A-SH3 domain interactions: identification of residues critical for binding and implications for viral RNA replication and modulation of cell signalling The Journal of General Virology, 86, (Pt 4), pp. 1035-1044. (doi:10.1099/vir.0.80734-0).

Record type: Article

Abstract

The NS5A protein of hepatitis C virus has been shown to interact with a subset of Src homology 3 (SH3) domain-containing proteins. The molecular mechanisms underlying these observations have not been fully characterized, therefore a previous analysis of NS5A–SH3 domain interactions was extended. By using a semi-quantitative ELISA assay, a hierarchy of binding between various SH3 domains for NS5A was demonstrated. Molecular modelling of a polyproline motif within NS5A (termed PP2.2) bound to the FynSH3 domain predicted that the specificity-determining RT-loop region within the SH3 domain did not interact directly with the PP2.2 motif. However, it was demonstrated that the RT loop did contribute to the specificity of binding, implicating the involvement of other intermolecular contacts between NS5A and SH3 domains. The modelling analysis also predicted a critical role for a conserved arginine located at the C terminus of the PP2.2 motif; this was confirmed experimentally. Finally, it was demonstrated that, in comparison with wild-type replicon cells, inhibition of the transcription factor AP-1, a function previously assigned to NS5A, was not observed in cells harbouring a subgenomic replicon containing a mutation within the PP2.2 motif. However, the ability of the mutated replicon to establish itself within Huh-7 cells was unaffected. The highly conserved nature of the PP2.2 motif within NS5A suggests that functions involving this motif are of importance, but are unlikely to play a role in replication of the viral RNA genome. It is more likely that they play a role in altering the cellular environment to favour viral persistence.

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Published date: 2005

Identifiers

Local EPrints ID: 27245
URI: http://eprints.soton.ac.uk/id/eprint/27245
PURE UUID: 85fe46b7-c7ff-482f-bcf3-fcc4394f6c5d

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Date deposited: 26 Apr 2006
Last modified: 17 Jul 2017 16:05

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Contributors

Author: A. MacDonald
Author: S. Mazaleyrat
Author: C. McCormick
Author: A. Street
Author: N.J. Burgoyne
Author: R.M. Jackson
Author: V. Cazeaux
Author: H. Shelton
Author: K. Saksela
Author: M. Harris

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