Function
Mitogen-activated protein kinase kinase kinase kinase 1 (MAP4K1) or hematopoietic progenitor kinase (HPK1) modulates cell cycle through MAPK and DNA damage/repair pathways. HPK1 is a member of the serine/threonine kinases and is a prominent regulator in adaptive immunity by downregulating T-cell receptor signaling and B-cell receptor signaling via phosphorylation and ubiquitination[1].
Relevance
HPK1 is over expressed in acute myeloid leukemia cell lines and hence is a potential target for development of therapies to it[2]. Mice that received HPK1 became resistant to lung tumor growth[3].
Structural highlights
The 3D structure of the non-phosphorylated HPK1 kinase domain dimer shows the interactions of the which contain the . The activation loop contains the (colored in lightsalmon) which regulates the catalysis of the kinase and is involved in the binding of ATP. The cancer drug [4].
HPK1 3D structures
3D structures of HPK1