Figure 1. Experimental system. Schematic representation (top) of the synthesis
on the ribosome of the Ade1 protein from the transcript containing a premature
stop codon (star). In a [PSI+] strain, Sup35 (circle) is prionized (square)
and doesn't bind Sup45 (triangle) to form release factor. This leads to a
frequent read-through of the stop codon and to the synthesis of full-length
Ade1, that can be detected as growth on adenineless media and white color on
YPD medium (bottom).