학술논문
Glycolipid Reanchoring of T-Lymphocyte Surface Antigen CD8 Using the 3′ End Sequence of Decay-Accelerating Factor's mRNA
Document Type
research-article
Author
Source
Proceedings of the National Academy of Sciences of the United States of America, 1988 May . 85(10), 3555-3559.
Subject
Language
English
ISSN
00278424
Abstract
Decay-accelerating factor (DAF) is one of a family of cell-associated proteins that undergo posttranslational modifications in which glycolipid anchoring structures are substituted for membrane-spanning sequences. The signals that direct the covalent substitution reaction in these proteins are unknown. Human DAF was expressed in Chinese hamster ovary (CHO) cells and murine BW lymphocytes. In both cases, the xenogeneic DAF in transfectants incorporated a glycolipid anchor. A chimeric CD8-DAF cDNA, encompassing the extracellular region of the T-lymphocyte surface antigen CD8 and the 3′ end of DAF mRNA (encoding the C-terminal region of mature DAF as well as the hydrophobic extension peptide), was expressed in human leukemia lines after transfection with an Epstein-Barr virus-based episomal vector. The chimeric protein in transfectants demonstrated glycolipid anchoring, whereas unaltered CD8 in control experiments did not. The signals directing glycolipid anchoring in eukaryotic cells are thus evolutionarily conserved and contained in the 3′ end of the DAF sequence.