Abstract
The measles virus entry system, consisting of attachment (hemagglutinin, H) and fusion proteins, operates by means of a variety of natural and targeted receptors; however, the mechanism that triggers fusion of the viral envelope with the plasma membrane is not understood. Here, we tested a model proposing that the two heads of an H dimer, which are covalently linked at their base, after binding two receptor molecules, move relative to each other to transmit the fusion-triggering signal. Indeed, stabilizing the H-dimer interface with additional intermolecular disulfide bonds prevented membrane fusion, an effect that was reversed by a reducing agent. Moreover, a membrane-anchored designated receptor efficiently triggered fusion, provided that it engaged the H dimer at locations proximal to where the natural receptors bind and distal to the H-dimer interface. We discuss how receptors may force H-protein heads to switch partners and transmit the fusion-triggering signal.
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Acknowledgements
We thank J. Maher, D., Katzmann, B. Lee, C. Russell and R. Iorio for comments on the manuscript, S. Russell (Mayo Clinic) for the Vero-His cell line, C. Muller (University of Trier) for the BH6 antibody, A. Kirk (Mayo Clinic) and R. Weaver (Mayo Clinic) for help with H-tetramer interface mutagenesis, T. Stehle (University of Tuebingen) for communicating unpublished information and M. Bennett for excellent secretarial assistance. This work was supported by US National Institutes of Health grant R01 CA90636 and by the Mayo Clinic Cancer Center. Part of L.K.'s and L.R.'s stipends was supported by the Mayo Graduate School SURF program.
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R.C. and C.K.N. conceived the projects. N.O. and W.B. planned cysteine mutagenesis. C.K.N. and V.H.J.L. planned histidine tagging. C.K.N., L.R. and L.K. generated the expression plasmids and characterized the function of all the mutated proteins. C.K.N., V.H.J.L., W.B. and R.C. contributed to the analysis of the data and prepared the manuscript.
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Patent applications on which R.C. is an inventor have been licensed to NISCO, Inc. The Mayo Clinic has an equity position in NISCO; the Mayo Clinic has not yet received royalties from products developed by the company, but may receive these in the future.
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Navaratnarajah, C., Oezguen, N., Rupp, L. et al. The heads of the measles virus attachment protein move to transmit the fusion-triggering signal. Nat Struct Mol Biol 18, 128–134 (2011). https://doi.org/10.1038/nsmb.1967
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DOI: https://doi.org/10.1038/nsmb.1967
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