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Mutants of the membrane-binding region of Semliki Forest virus E2 protein. I. Cell surface transport and fusogenic activity

Three mutations of the membrane-binding region of the Semliki Forest virus (SFV) p62 polypeptide (the precursor for virion E3 and E2) have been made by oligonucleotide-directed mutagenesis of a cDNA clone encoding the SFV structural proteins. One of the mutations (A2) substitutes a Glu for an Ala in...

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Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1986
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2114105/
https://www.ncbi.nlm.nih.gov/pubmed/3753980
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collection PubMed
description Three mutations of the membrane-binding region of the Semliki Forest virus (SFV) p62 polypeptide (the precursor for virion E3 and E2) have been made by oligonucleotide-directed mutagenesis of a cDNA clone encoding the SFV structural proteins. One of the mutations (A2) substitutes a Glu for an Ala in the middle of the hydrophobic stretch which spans the bilayer. A1 and A3 alter the two basic charged amino acids in the cytoplasmic domain next to the hydrophobic region. The wild-type charge cluster of Arg-Ser-Lys (+2) has been changed to Gly- Ser-Met (0;A3) or to Gly-Ser-Glu (-1;A1). The mutant p62 proteins have been analyzed both in the presence and the absence of E1, the other half of the heterodimer spike complex of SFV. The mutant proteins expressed in COS-7 cells are glycosylated and are of the expected sizes. When co-expressed with E1, all three mutants are cleaved to yield the E2 protein and transported to the surface of COS-7 cells. When expressed in the absence of E1, the mutant p62 proteins remain uncleaved but still reach the cell surface. Once at the cell surface, all three mutants, when co-expressed with E1, can promote low pH- triggered cell-cell fusion. These results show that the three mutant p62/E2 proteins are still membrane associated in a functionally unaltered way.
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spelling pubmed-21141052008-05-01 Mutants of the membrane-binding region of Semliki Forest virus E2 protein. I. Cell surface transport and fusogenic activity J Cell Biol Articles Three mutations of the membrane-binding region of the Semliki Forest virus (SFV) p62 polypeptide (the precursor for virion E3 and E2) have been made by oligonucleotide-directed mutagenesis of a cDNA clone encoding the SFV structural proteins. One of the mutations (A2) substitutes a Glu for an Ala in the middle of the hydrophobic stretch which spans the bilayer. A1 and A3 alter the two basic charged amino acids in the cytoplasmic domain next to the hydrophobic region. The wild-type charge cluster of Arg-Ser-Lys (+2) has been changed to Gly- Ser-Met (0;A3) or to Gly-Ser-Glu (-1;A1). The mutant p62 proteins have been analyzed both in the presence and the absence of E1, the other half of the heterodimer spike complex of SFV. The mutant proteins expressed in COS-7 cells are glycosylated and are of the expected sizes. When co-expressed with E1, all three mutants are cleaved to yield the E2 protein and transported to the surface of COS-7 cells. When expressed in the absence of E1, the mutant p62 proteins remain uncleaved but still reach the cell surface. Once at the cell surface, all three mutants, when co-expressed with E1, can promote low pH- triggered cell-cell fusion. These results show that the three mutant p62/E2 proteins are still membrane associated in a functionally unaltered way. The Rockefeller University Press 1986-03-01 /pmc/articles/PMC2114105/ /pubmed/3753980 Text en This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Articles
Mutants of the membrane-binding region of Semliki Forest virus E2 protein. I. Cell surface transport and fusogenic activity
title Mutants of the membrane-binding region of Semliki Forest virus E2 protein. I. Cell surface transport and fusogenic activity
title_full Mutants of the membrane-binding region of Semliki Forest virus E2 protein. I. Cell surface transport and fusogenic activity
title_fullStr Mutants of the membrane-binding region of Semliki Forest virus E2 protein. I. Cell surface transport and fusogenic activity
title_full_unstemmed Mutants of the membrane-binding region of Semliki Forest virus E2 protein. I. Cell surface transport and fusogenic activity
title_short Mutants of the membrane-binding region of Semliki Forest virus E2 protein. I. Cell surface transport and fusogenic activity
title_sort mutants of the membrane-binding region of semliki forest virus e2 protein. i. cell surface transport and fusogenic activity
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2114105/
https://www.ncbi.nlm.nih.gov/pubmed/3753980