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CUTTING EDGE |


*
Laboratory of Experimental Immunology, Division of Basic Sciences, and
Intramural Research Support Program, SAIC Frederick, National Cancer Institute-Frederick Cancer Reseach and Development Center, Frederick, MD 21702;
Division of Hematologic Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Washington, DC; and
§
Laboratory of Mammalian Genes and Development, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892
Ly-49D is an activating receptor on NK
cells that does not become tyrosine phosphorylated upon
activation. This report demonstrates that immunoprecipitation of
Ly-49D, following pervanadate treatment or specific Ab cross-linking,
coprecipitates a 16-kDa tyrosine-phosphorylated protein
(pp16). Immunoblotting experiments and data from TCR-
/Fc
RI
double knockout mice confirm that pp16 is not TCR-
, TCR-
, or
Fc
RI
. Association of pp16 with Ly-49D involves a transmembrane
arginine since mutation to leucine (Ly-49DR54L)
abolishes association with pp16 in transfected P815 cells. In addition,
Ly-49DR54L transfectants fail to mediate Ca2+
mobilization following Ab cross-linking. Therefore, signaling through
Ly-49D on NK cells depends on association with a distinct tyrosine
phosphoprotein (pp16) in a manner analogous to that of TCR and FcR.
Expression of this novel signaling peptide in both the NK and myeloid
lineages indicates that pp16 is likely involved in the signal
transduction cascade of additional receptor families.
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