Linked Life Data

9400601

Source:http://linkedlifedata.com/resource/pubmed/id/9400601

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pubmed-article:9400601pubmed:abstractTextSimian virus 5 fusion (F) protein mutant F-G3A, which contains a glycine-to-alanine substitution at position 3 in the conserved hydrophobic fusion peptide at the N-terminus of the F1 subunit, has been shown previously to cause increased syncytium formation compared to wild-type (wt) F protein, when expressed using an SV40 recombinant virus vector system (C. M. Horvath and R. A. Lamb (1992) J. Virol. 66, 2443-2455). The wt F and the F-G3A proteins were expressed in eukaryotic cells using the vaccinia virus-bacteriophage T7 RNA polymerase (vac-T7) expression system, and they showed similar cell surface expression levels as determined by flow cytometry. The final extent of fusion when the vac-T7 expression system was used was not found to be greatly different when examined with a reporter gene activation assay. However, the initial rate of fusion was found to be five- to sixfold higher for the F-G3A mutant protein than the wt F protein, when examined using a quantitative assay for lipid mixing based on relief of self-quenching of fluorescence of the lipid probe octadecyl rhodamine (R18). A microscopic fluorescent dye transfer assay also showed a much earlier spread of dye from R18-labeled red blood cells to the cells expressing the mutant F-G3A protein than the wt F protein. Thus, these data indicate that a single gly-to-ala mutation in the fusion peptide domain, although not affecting the final extent of fusion, significantly increased the rate of fusion. Possible mechanisms for the increased rate of fusion are discussed.lld:pubmed
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pubmed-article:9400601pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:9400601pubmed:articleTitleA glycine to alanine substitution in the paramyxovirus SV5 fusion peptide increases the initial rate of fusion.lld:pubmed
pubmed-article:9400601pubmed:affiliationHoward Hughes Medical Institute, Northwestern University, Evanston, Illinois 60208-3500, USA.lld:pubmed
pubmed-article:9400601pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9400601pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:9400601pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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