E3 ubiquitin-protein ligase Praja 1, E3 ubiquitin-protein ligase Praja-1, PJA1, PJA1_HUMAN, PRAJA 1, Praja ring finger 1, Praja1, Ring Finger Protein 70.
Has E2-dependent E3 ubiquitin-protein ligase activity. Ubiquitinates MAGED1 antigen leading to its subsequent degradation by proteasome (By similarity). May be involved in protein sorting.