RNA-binding E3 ubiquitin-protein ligase MEX3C (MEX3C)

E3 ubiquitin ligase responsible for the post- transcriptional regulation of common HLA-A allotypes. Binds to the 3' UTR of HLA-A2 mRNA, and regulates its levels by promoting mRNA decay.

RNA binding is sufficient to stop translation, but ubiquitin ligase activity is required for mRNA degradation. .