Enables ubiquitin protein ligase binding activity and ubiquitin-protein transferase regulator activity. Involved in several processes, including negative regulation of DNA-binding transcription factor activity; positive regulation of proteasomal ubiquitin-dependent protein catabolic process; and regulation of myeloid leukocyte differentiation. Predicted to be located in cytoplasm. Predicted to be active in nucleus. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; heart valve; and integumental system. Orthologous to human TRIB1 (tribbles pseudokinase 1). [provided by Alliance of Genome Resources, Apr 2022]