an ubiquitous protein kinase of the STE20 family. May play a role in the response to environmental stress. Regulated by amino acids and acts upstream of mTORC1 and JNK. Required for maximal S6K and 4E-BP1 phosphorylation. Interacts with PPP2R5E, a regulatory subunit of PP2A. Following amino acid withdrawal, pS170 is dephosphorylated via PP2A. The dephosphorylation of pS170 by PP2A in response to amino acid restriction inhibits mTORC1 signaling. The inhibition of PPP2R5E expression prevents the dephosphorylation of KHS2 pS170, impairing mTORC1 inhibition during amino acid withdrawal. Three alternatively spliced isoforms have been described. Note: This description may include information from UniProtKB.
Protein type: EC 22.214.171.124; KHS subfamily; Kinase, protein; Protein kinase, STE; Protein kinase, Ser/Thr (non-receptor); STE group; STE20 family