Cytosolic MOB1A and MOB1B are phosphorylated by phospho-STK4(MST1)/N (Graves et al. 1998; Lee et al. 2001). Threonine residues 12 and 35 have been experimentally identifed as the targets of MOB1A phosphorylation; the homologous residues of MOB1B are inferred likewise to be targets.
protein serine/threonine kinase activity of p-STK4/N:p-SAV1 [cytosol]