Source: Active recombinant GST-tagged protein expressed in E. coli · MW: ~40 kDa. PCAF belongs to the GCN5/PCAF family of nuclear HATs. Cayman's PCAF preparation contains 165 amino acids from the HAT activity domain of human PCAF fused to GST at the N-terminus. Enzyme activity was determined using a fluorescent HAT assay and is comparable to that found in the literature.