Yeast nuclear RNA processing

Figure 1 Schematic representation of rRNA processing pathway in Saccharomyces cerevisiae. The full-length rRNA precursor undergoes several cleavage steps to produce functional 18S, 5.8S and 25S rRNAs for 60S and 40S ribosomes. Green trapezoids indicate points in the processing pathway at which Mtr4p activity has been shown to play a role. Also indicated are steps of processing that have been found to be completed in the cytoplasm[7,11].