
Heatmap of proteins in 90S preribosomes. The first sample (ITS1-239/Noc4-TAP) was purified via a plasmid-derived 5′-MS2-tagged pre-rRNA fragment ending at position 239 of ITS1 and Noc4-TAP and represents an unprocessed state of mature 90S with most labile factors released. The other samples were purified via Noc4-TAP, Utp30-TAP, and Noc4-TAP in utp30Δ strain. The first two samples from our previous study were included for comparison. Relative spectral abundance factors (RSAF) were normalized against six UTPB proteins and color-coded. The labile factors dissociated in mature 90S particles are colored magenta.










