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J. Exp. Med.,
Volume 189, Number 5, March 1, 1999 787-796
By





From the * Istituto Nazionale per la Ricerca sul Cancro and Centro Biotecnologie Avanzate, 16132 Genova, Italy; Surface receptors involved in natural killer (NK) cell triggering during the process of tumor cell
lysis have recently been identified. Of these receptors, NKp44 is selectively expressed by IL-2-
activated NK cells and may contribute to the increased efficiency of activated NK cells to mediate tumor cell lysis. Here we describe the molecular cloning of NKp44. Analysis of the cloned cDNA indicated that NKp44 is a novel transmembrane glycoprotein belonging to the
Immunoglobulin superfamily characterized by a single extracellular V-type domain. The
charged amino acid lysine in the transmembrane region may be involved in the association of
NKp44 with the signal transducing molecule killer activating receptor-associated polypeptide
(KARAP)/DAP12. These molecules were found to be crucial for the surface expression of
NKp44. In agreement with data of NKp44 surface expression, the NKp44 transcripts were
strictly confined to activated NK cells and to a minor subset of TCR-
Dipartimento di Medicina Sperimentale, Università degli Studi di Genova, 16132 Genova, Italy; and § Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia,
25100 Brescia, Italy
/
+ T lymphocytes.
Unlike genes coding for other receptors involved in NK cell triggering or inhibition, the
NKp44 gene is on human chromosome 6.
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