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- W1968693129 abstract "Membrane-bound immunoglobulins have, in addition to the transmembrane and cytoplasmic portions, an extracellular membrane-proximal domain (EMPD), absent in the secretory forms. EMPDs of immunoglobulin isotypes alpha, gamma, and epsilon contain cysteines whose role has so far not been elucidated. Using a genetic strategy, we investigated the ability of these cysteines to form disulfide bridges. Shortened versions of human membrane immunoglobulins, depleted of cysteines known to form intermolecular disulfide bonds, were constructed and expressed on the surface of a B-cell line. The resulting membrane proteins contain a single chain fragment of variable regions (scFv) linked to the dimerizing domain from the immunoglobulin heavy chains (CH3 for alpha and gamma or CH4 for epsilon isotypes), followed by the corresponding EMPD and the transmembrane and cytoplasmic domains. The two functional membrane versions of the epsilon chain, containing the short and long EMPD, were analyzed. Our results show that the single cysteine within alpha1L and gamma1 EMPD and the short version of epsilon EMPD form an interchain disulfide bond. Conversely, the cysteine resident in the epsilon transmembrane domain remains unreacted. epsilon-long EMPD contains four cysteines; two are involved in interchain bonds while the remaining two are likely forming an intrachain bridge. Expression of a full-length membrane epsilon heavy chain mutant, in which Cys(121) and Cys(209) within domain CH2 (involved in interchain bridges) were mutated to alanines, confirmed that, within the complete IgE, EMPD cysteines form interchain disulfide bonds. In conclusion, we unveil evidence for additional covalent stabilization of membrane-bound immunoglobulins." @default.
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- W1968693129 date "2001-08-10" @default.
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- W1968693129 title "Membrane Immunoglobulins Are Stabilized by Interchain Disulfide Bonds Occurring within the Extracellular Membrane-Proximal Domain" @default.
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- W1968693129 doi "https://doi.org/10.1021/bi010506+" @default.
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