Inhibitory receptor that acts as a critical regulator of hematopoietic lineage differentiation, megakaryocyte function and platelet production ( ). Inhibits platelet aggregation and activation by agonists such as ADP and collagen-related peptide . This regulation of megakaryocate function as well as platelet production ann activation is done through the inhibition (via the 2 ITIM motifs) of the receptors CLEC1B and GP6:FcRgamma signaling . Appears to operate in a calcium-independent manner .
Isoform B, displayed in this entry, is the only isoform to contain both a transmembrane region and 2 immunoreceptor tyrosine-based inhibitor motifs (ITIMs) and, thus, the only one which probably has a role of inhibitory receptor. Isoform A may be the activating counterpart of isoform B.
Subcellular locations: Endoplasmic reticulum, Golgi apparatus
Subcellular locations: Endoplasmic reticulum, Golgi apparatus
Subcellular locations: Cell membrane
Subcellular locations: Cell membrane
Expressed in platelets. Expressed in a restricted set of hematopoietic cell lines including the erythroleukemia cell line K-562 and the T-cell leukemia cell lines MOLT-4 and Jurkat. Not detected in the monocyte-like cell line U-937, the B-cell-like cell line Raji, the fibroblast cell lines TK and HeLa, or the natural killer cell lines NKL, NK 62 and YT.