May enhance ubiquitin ligase activity of RING-type zinc finger-containing E3 ubiquitin-protein ligases. Proposed to act through recruitment and/or stabilization of the Ubl-conjugating enzyme (E2) at the E3:substrate complex.
Expressed only in brain and ovary among normal tissues. Isoform 1 and isoform 2 are specifically expressed in glioma cells among cancer cells. Detected in some renal cell carcinoma samples.