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Pubmed ID :8946682
Publication Date : //

NK cell receptor gene of the KIR family with two IG domains but highest homology to KIR receptors with three IG domains.


The killer cell inhibitory receptors (KIRs) are surface glycoproteins expressed by natural killer (NK) cells and some T cells. They recognize polymorphic human HLA class I molecules. Two families of KIRs have been identified and named p58 and p70. The p58 family of genes encode type I membrane proteins with two extracellular immunoglobulin (Ig) domains, while the p70 genes have three Ig domains. We here report the cloning and characterization of a novel KIR cDNA obtained from tumor cell lines with NK reactivity (YT and NK-92). This gene is also expressed in the normal cell line NK 3.3 and in NK cells obtained from some but not all normal donors. The clone, KIR103AS, has an open reading frame consistent with a KIR with two extracellular Ig domains, a transmembrane region and a 114 amino acid long cytoplasmic domain containing a single src homology 2 (SH2) binding motif. The membrane distal Ig domain of KIR103AS has highest homology with the first Ig domain of p70 KIRs and differs significantly from the first Ig domain of p58 KIRs. The second, membrane proximal Ig domain of KIR103AS has similar and high homology with the membrane proximal Ig domains of both p70 and p58 KIRs. The extracellular domains of KIR103AS therefore share characteristic features with both p70 and p58 genes: the domain structure is identical to p58 KIRs but the sequence homology matches closely with p70 KIRs. The putative transmembrane and cytoplasmic domains are distinctly different from all previously reported KIR cDNAs.

Authors : Selvakumar A , Steffens U , Dupont B ,

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