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00925njm 22002777a 4500 dc González-Reyes, L author Ruiz-Argüello, M B author Garcia-Barreno, Blanca author Calder, L author López, J A author Albar, Juan Pablo author Skehel, J J author Wiley, D C author Melero, Jose Antonio author 2001-08-14 Preparations of purified full-length fusion (F) protein of human respiratory syncytial virus (HRSV) expressed in recombinant vaccinia-F infected cells, or of an anchorless mutant (F(TM(-))) lacking the C-terminal 50 amino acids secreted from vaccinia-F(TM(-))-infected cells contain a minor polypeptide that is an intermediate product of proteolytic processing of the F protein precursor F0. N-terminal sequencing of the intermediate demonstrated that it is generated by cleavage at a furin-motif, residues 106-109 of the F sequence. By contrast, the F1 N terminus derives from cleavage at residue 137 of F0 which is also C-terminal to a furin recognition site at residues 131-136. Site-directed mutagenesis indicates that processing of F0 protein involves independent cleavage at both sites. Both cleavages are required for the F protein to be active in membrane fusion as judged by syncytia formation, and they allow changes in F structure from cone- to lollipop-shaped spikes and the formation of rosettes by anchorless F. Proc Natl Acad Sci USA. 2001 Aug 14;98(17):9859-64. 10.1073/pnas.151098198 0027-8424 Proceedings of the National Academy of Sciences of the United States of America 11493675 http://hdl.handle.net/20.500.12105/9952 Cleavage of the human respiratory syncytial virus fusion protein at two distinct sites is required for activation of membrane fusion