T.L. Tran
The Respiratory syncytial virus M2-1 protein forms tetramers and interacts with RNA and P in a competitive manner
Tran, T.L.; Castagné, N.; Dubosclard, V.; Noinville, S.; Koch, E.; Moudjou, M.; Henry, C.; Bernard, J.; Yeo, R.P.; Eléouët, J.F.
Authors
N. Castagné
V. Dubosclard
S. Noinville
E. Koch
M. Moudjou
C. Henry
J. Bernard
R.P. Yeo
J.F. Eléouët
Abstract
The Respiratory Syncytial Virus (RSV) M2-1 protein is an essential cofactor of the viral RNA polymerase complex and functions as a transcriptional processivity and antitermination factor. M2-1, which exists as a phosphorylated or non-phosphorylated form in infected cells, is an RNA-binding protein that also interacts with some of the other components of the viral polymerase complex. It contains a CCCH motif at the N-terminus, a putative zinc-binding domain that is essential for M2-1 function. To gain insight into its structural organization, M2-1 was produced as a recombinant protein in E. coli and purified to > 95% homogeneity using a glutathione S-transferase (GST) tag. The GST-M2-1 fusion proteins were co-purified with bacterial RNA that could be eliminated by high salt wash. Circular dichroism showed that M2-1 is largely alpha-helical. Chemical cross-linking, dynamic light scattering, sedimentation velocity and electron microscopy led to the conclusion that M2-1 forms a 5.4 S tetramer of 89 kDa and of approximately 7.6 nm in diameter at micromolar concentrations. By using a series of deletion mutants, the oligomerization domain of M2-1 was mapped to a putative alpha-helix consisting of amino acid residues 32-63. When tested in an RSV minigenome replicon system using luciferase as a reporter gene, a M2-1 deletion mutant lacking this region showed a significant reduction in RNA transcription compared to wild-type M2-1, indicating that M2-1 oligomerization is essential for its activity. We also show that the region encompassing amino acid residues 59-178 binds to P and RNA in a competitive manner that is independent of M2-1's phosphorylation status.
Citation
Tran, T., Castagné, N., Dubosclard, V., Noinville, S., Koch, E., Moudjou, M., …Eléouët, J. (2009). The Respiratory syncytial virus M2-1 protein forms tetramers and interacts with RNA and P in a competitive manner. Journal of Virology, 83(13), 6363-6374. https://doi.org/10.1128/jvi.00335-09
Journal Article Type | Article |
---|---|
Publication Date | Jul 1, 2009 |
Deposit Date | Jun 19, 2009 |
Journal | Journal of Virology |
Print ISSN | 0022-538X |
Electronic ISSN | 1098-5514 |
Publisher | American Society for Microbiology |
Peer Reviewed | Peer Reviewed |
Volume | 83 |
Issue | 13 |
Pages | 6363-6374 |
DOI | https://doi.org/10.1128/jvi.00335-09 |
Keywords | RSV, M2-1, Oligomer, Interaction, Polymerase. |
Publisher URL | http://jvi.asm.org/cgi/reprint/JVI.00335-09v1 |
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