Serine/threonine-protein kinase OSR1 (OXSR1)

Phosphorylates RELL1, RELL2 and RELT (PubMed:16389068, PubMed:28688764).

Phosphorylates PAK1 (PubMed:14707132).

Phosphorylates PLSCR1 in the presence of RELT (PubMed:22052202). .