E3 ubiquitin-protein ligase RBBP6 (RBBP6)

E3 ubiquitin-protein ligase which promotes ubiquitination of YBX1, resulting in its degradation by the proteasome (PubMed:18851979). May play a role as a scaffold protein to promote the assembly of this p53/TP53-MDM2 complex, resulting in increase of MDM2-mediated ubiquitination and degradation of p53/TP53; may be the negative regulator of p53/TP53, resulting in both apoptosis and cell growth (By similarity).

Regulates DNA-replication and the stability of chromosomal common fragile sites (CFSs) in a ZBTB38- and MCM10- dependent way. Controls ZBTB38 protein stability and abundance via ubiquitination and proteasomal degradation, and ZBTB38 subsequently negatively regulates the expression of MCM10 that has an important role in DNA-replication (PubMed:24726359).