Abstract
Measles virus (MV) encodes the fusion protein (F) that mediates cell fusion and intercellular spread of the virus, and is homologous to the carboxy terminus of the neuropeptide substance P (SP). In addition, the oligopeptide Z-D-Phe-L-Phe-Gly, also homologous to F and SP, inhibits MV fusion with target cells. These observations raise the question of whether MV uses the SP receptor (SPR) during a specific phase of its infectious cycle. In this report, we examine the structural and functional consequences of this interaction and show, using cross-linking studies, that MV and SP specifically bind to a 52-58-kD protein, previously reported to comprise the SPR on human IM-9 lymphoblasts. Moreover, bound MV and SP are shown to reciprocally displace each other from these cells. In addition, we demonstrate that anti-SP antisera inhibits the cell-to-cell spread of MV, and that SP blocks MV fusion with target cells. These results indicate the presence of MV-SPR interactions during viral fusion, and suggest possible novel mechanisms for viral entry into cells.
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