Transcriptional coactivator that specifically associates with POU2F3 (PubMed:35576971). This complex drives the development of tuft cells, a rare a rare chemosensory cells that coordinate immune and neural functions within mucosal epithelial tissues (PubMed:35576971). . This is the function of POU2AF3 (POU class 2 homeobox associating factor 3, Ensembl gene identifier ENSG00000214290).