Enables transcription coactivator activity. Acts upstream of or within several processes, including extracellular matrix organization; histone H3-K56 acetylation; and positive regulation of chondrocyte proliferation. Located in chromatin; cytoplasm; and nucleus. Part of transcription regulator complex. Is expressed in brain; diaphragm; gut; heart ventricle; and spinal cord ventricular layer. Orthologous to human PBXIP1 (PBX homeobox interacting protein 1). [provided by Alliance of Genome Resources, Apr 2022]