Abstract
The mouse Lyt-3 agene, which encodes the Lyt-3.1 T-cell surface alloantigen of the C.AKR strain, has been cloned, and the nucleotide sequence of its exons and more than 2 kb of 5′ flanking sequence have been determined. The gene extends over approximately 16 kb of DNA and consists of six exons encoding leader, leader plus V-like domain, membrane-proximal, transmembrane, and cytoplasmic domains. The only difference between the coding region of the Lyt-3 agene and the cDNA sequences reported for Lyt-3 b(Nakauchi et al. 1987, Panaccio et al. 1987) is at position 77 of the mature protein where Lyt-3 aencodes serine and Lyt-3 bencodes arginine. This substitution must therefore be the basis for the serological distinction between the Lyt-3.1 and Lyt-3.2 alloantigens. Potential TATA and CAAT sequences, two Sp1 protein binding sites, two extended repeats of the dinucleotide, CA, a number of short inverted repeats, and an inverted segment of the mouse B1 repetitive sequence are found 5′ to the Lyt-3 agene. Two consensus poly-A addition signals and a complete copy of the mouse B1 sequence are found 3′ to the gene. Both B1-related regions are flanked by short direct repeats suggesting that they arose by an insertional mechanism. Cotransfection of the Lyt-3 agene together with a cloned Lyt-2 agene resulted in expression of both Lyt-2 and Lyt-3.1 on the surface of Ltk− and BW5147 cells. Transfection of the Lyt-3 agene without Lyt-2 aled to expression of Lyt-3-related cellular RNA but did not result in surface expression of Lyt-3.1, suggesting that the Lyt-3 glycoprotein is not expressed on the cell surface in the absence of Lyt-2.
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Youn, H.J., Harriss, J.V. & Gottlieb, P.D. Structure and expression of the Lyt-3 agene of C.AKR mice. Immunogenetics 28, 353–361 (1988). https://doi.org/10.1007/BF00364234
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DOI: https://doi.org/10.1007/BF00364234