Involved in the inactivation of MAP kinases. Dephosphorylates ERK, JNK and p38 MAP-kinases. Plays a negative role in TCR signaling by dephosphorylating MAP3K7 adapter TAB1 leading to its inactivation (PubMed:24403530). {ECO:0000269|PubMed:24403530}.
TRAF2-mediated Lys63-linked ubiquitination of DUSP14/MKP6 is essential for its phosphatase activity. Mass spectrometry and mutational analyses identified that DUSP14 was Lys63-linked ubiquitinated at lysine 103 residue.Here we report that DUSP14 was Lys63-linked ubiquitinated at Lys103 residue by the E3 ligase TRAF2 during TCR signaling. Furthermore, ubiquitination of DUSP14 was essential for its phosphatase activity.