title: Gene structure of the murine NK cell receptor 2B4: presence of two alternatively spliced isoforms with distinct cytoplasmic domains.
abstract: The NK cell receptor 2B4 is expressed on the surface of all murine NK cells and a subset of T cells. Ligation of 2B4 with monoclonal antibodies increases target cell lysis and IFN-gamma production. 2B4 is the high-affinity counter-receptor for CD48 in mice and humans. 2B4-L is a member of the CD2 subgroup of the immunoglobulin supergene family, which includes CD48, LFA-3, CD84, Ly9 and SLAM. Here we describe 2B4-S, a second 2B4 isoform, and the genomic structure of the 2B4 gene. 2B4-S is identical to the 5' end of 2B4-L, differing only at the 3' end, corresponding to a portion of the cytoplasmic domain and the 3' untranslated sequence. Both 2B4-L and 2B4-S are expressed on IL-2-activated NK cells. The genomic clone of 2B4 reveals that the two cDNA clones are products of alternative splicing. Since they differ only in a portion of the cytoplasmic domain, it is likely that they transduce different signals.
authors.affiliation: Immunology Graduate Program University of Texas Southwestern Medical Center, Dallas, USA. stepp@utsw.swmed.edu
authors.forename: S E
authors.initials: SE
authors.lastname: Stepp
authors.forename: J D
authors.initials: JD
authors.lastname: Schatzle
authors.forename: M
authors.initials: M
authors.lastname: Bennett
authors.forename: V
authors.initials: V
authors.lastname: Kumar
authors.forename: P A
authors.initials: PA
authors.lastname: Mathew
mesh_terms: D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D015703:Antigens, CD; D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D003593:Cytoplasm / Q000737:chemistry; D017931:DNA Primers / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics; D005091:Exons; D006801:Humans; D007438:Introns; D007694:Killer Cells, Natural / Q000276:immunology*; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000235:genetics* / Q000276:immunology*; D051379:Mice; D008969:Molecular Sequence Data; D020033:Protein Isoforms / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D011971:Receptors, Immunologic / Q000737:chemistry / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D000071176:Signaling Lymphocytic Activation Molecule Family
chemical_list: D015703:Antigens, CD; C084093:CD244 protein, human; C490007:Cd244a protein, mouse; D017931:DNA Primers; D018076:DNA, Complementary; D008562:Membrane Glycoproteins; D020033:Protein Isoforms; D011971:Receptors, Immunologic; D000071176:Signaling Lymphocytic Activation Molecule Family