Catalytic component of the SRCAP complex which mediates the ATP-dependent exchange of histone H2AZ/H2B dimers for nucleosomal H2A/H2B, leading to transcriptional regulation of selected genes by chromatin remodeling. Acts as a coactivator for CREB-mediated transcription, steroid receptor-mediated transcription, and Notch-mediated transcription. Defects in SRCAP are the cause of Floating-Harbor syndrome (FLHS). A rare genetic disorder characterized by proportionate short stature, delayed bone age, delayed speech development, and typical facial features. The face is triangular with deep-set eyes, long eyelashes, bulbous nose, wide columella, short philtrum, and thin lips. Belongs to the SNF2/RAD54 helicase family. SWR1 subfamily. 3 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.