XK-related protein 5 (XKR5) is a novel negative regulator of KIT/D816V-mediated transformation

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In order to investigate the molecular mechanisms by which the oncogenic mutant KIT/D816V causes transformation of cells, we investigated proteins that selectively bind KIT/D816V, but not wild-type KIT, as potential mediators of transformation. By mass spectrometry several proteins were identified, among them a previously uncharacterized protein denoted XKR5 (XK-related protein 5), which is related to the X Kell blood group proteins. We could demonstrate that interaction between XKR5 and KIT/D816V leads to phosphorylation of XKR5 at Tyr 369, Tyr487, and Tyr 543. Tyrosine phosphorylated XKR5 acts as a negative regulator of KIT signaling, which leads to downregulation of phosphorylation of ERK, AKT, and p38. This led to reduced proliferation and colony forming capacity in semi-solid medium. Taken together, our data demonstrate that XKR5 is a novel type of negative regulator of KIT-mediated transformation.


Enheter & grupper
Externa organisationer
  • Ningxia Medical University
  • University of Southern Denmark
  • Skåne University Hospital

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Cancer och onkologi
Utgåva nummer6
StatusPublished - 2018 jun 1
Peer review utfördJa