Predicted to enable ubiquitin protein ligase binding activity and ubiquitin-protein transferase activity. Predicted to contribute to damaged DNA binding activity. Involved in ribosome biogenesis. Acts upstream of or within positive regulation of G1/S transition of mitotic cell cycle and positive regulation of protein catabolic process. Predicted to be located in cytosol and nucleoplasm. Predicted to be part of Cul4B-RING E3 ubiquitin ligase complex. Is expressed in brain and liver. Used to study intellectual disability. Human ortholog(s) of this gene implicated in syndromic X-linked intellectual disability Cabezas type. Orthologous to human CUL4B (cullin 4B). [provided by Alliance of Genome Resources, Apr 2022]