Component of the UAF (upstream activation factor) complex which interacts with the upstream element of the RNA polymerase I promoter and forms a stable preinitiation complex. Together with SPT15/TBP UAF seems to stimulate basal transcription to a fully activated level. Component of the UAF (upstream activation factor) complex which consists of UAF30, RRN5, RRN9, RRN10, and histones H3 and H4.