Acts as a component of the STAGA transcription coactivator-HAT complex (PubMed:15932940, PubMed:18206972). Mediates the interaction of STAGA complex with the CRX and is involved in CRX-dependent gene activation (PubMed:15932940, PubMed:18206972). Necessary for microtubule cytoskeleton stabilization (PubMed:22100762).