XK-related protein 5 (XKR5)

XK-related protein 5 (XKR5) is a membrane-associated protein related to the XK family, commonly referenced in the context of blood group antigen complexes. It is highly expressed in hematopoietic cells and, based on recent research, acts as a unique negative regulator of signaling mediated by the oncogenic mutant KIT/D816V. XKR5 becomes tyrosine-phosphorylated upon interaction with KIT/D816V, which then leads to inhibition of downstream signaling including ERK, AKT, and p38 phosphorylation, resulting in suppression of cell proliferation and colony formation. This mechanism suggests an important moderating role for XKR5 in malignancies involving aberrant KIT signaling, especially certain leukemias. However, XKR5's precise biological functions beyond this regulatory interaction and its potential physiological transporter activity have not been fully elucidated. No drugs directly target XKR5, and there are no established biomarkers or safety concerns specific to this molecule as of current knowledge[1][2][5].

Other names

XKR5XK related 5XRG5UNQ2754/PRO6493HARL2754XK Kell blood group precursor-related family, member 5X-linked Kx blood group related 5XKKell blood group complex subunit-related family, member 5XKR5aXRG5AXRG5BM

No drugs directly target XKR5, but its negative regulatory effect is mediated by tyrosine phosphorylation when bound to mutant KIT/D816V, leading to reduced downstream oncogenic signaling (ERK, AKT, p38)