E3 ubiquitin-protein ligase RNF128 (Rnf128)

E3 ubiquitin-protein ligase that catalyzes 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains formation. Functions as an inhibitor of cytokine gene transcription.

Inhibits IL2 and IL4 transcription, thereby playing a significant role in the induction of the anergic phenotype, a long-term steady state of T-lymphocyte unresponsiveness to antigenic stimulation associated with the blockade of interleukin production. Ubiquitinates ARPC5 with'Lys- 48' linkages and COR1A with'Lys-63' linkages leading to their degradation, down-regulation of those cytosleletal components leads to impaired lamellipodium formation and reduced accumulation of F-actin at the immunological synapse.