title: Membrane immunoglobulin without sheath or anchor.
abstract: The canonical form of the B cell antigen receptor is composed of membrane immunoglobulin sheathed by the alpha/beta heterodimer. Whereas membrane IgM cannot be transported to the cell surface in the absence of alpha/beta, both IgD and IgG2b can be expressed naked (i.e. without alpha/beta) on the surface of myeloma transfectants. In the case of one cell-line, such naked IgD has been shown to be inserted into the membrane by a glycosyl-phosphatidylinositol anchor. Here, however, we show that both IgD and IgG2b (but not IgM) can be expressed on the surface of myeloma transfectants without either sheath or anchor. This distinction between the isotypes is attributable to differences in the region of the transmembrane segment.
authors.affiliation: Medical Research Council Laboratory of Molecular Biology, Cambridge, U.K.
authors.forename: G T
authors.initials: GT
authors.lastname: Williams
authors.forename: P
authors.initials: P
authors.lastname: Dariavach
authors.forename: A R
authors.initials: AR
authors.lastname: Venkitaraman
authors.forename: D J
authors.initials: DJ
authors.lastname: Gilmore
authors.forename: M S
authors.initials: MS
authors.lastname: Neuberger
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D007072:Immunoglobulin D / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D007074:Immunoglobulin G / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D007143:Immunoglobulin Heavy Chains / Q000737:chemistry; D007132:Immunoglobulin Isotypes; D008565:Membrane Proteins / Q000737:chemistry*; D051379:Mice; D008969:Molecular Sequence Data; D043265:Phosphatidylinositol Diacylglycerol-Lyase; D010727:Phosphoric Diester Hydrolases / Q000494:pharmacology; D010954:Plasmacytoma / Q000235:genetics / Q000276:immunology*; D010957:Plasmids; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D007072:Immunoglobulin D; D007074:Immunoglobulin G; D007143:Immunoglobulin Heavy Chains; D007132:Immunoglobulin Isotypes; D008565:Membrane Proteins; D010727:Phosphoric Diester Hydrolases; D043265:Phosphatidylinositol Diacylglycerol-Lyase