Schultz M C, Choe S Y, Reeder R H
Fred Hutchinson Cancer Research Center, Seattle, WA 98104.
Proc Natl Acad Sci U S A. 1991 Feb 1;88(3):1004-8. doi: 10.1073/pnas.88.3.1004.
A protocol is described for making a soluble whole-cell extract from yeast (Saccharomyces cerevisiae) that supports active and specific transcription initiation by RNA polymerases I, II, and III. Specific initiation by polymerase I decreases in high-density cultures, paralleling the decrease in abundance of the endogenous 35S rRNA precursor. This extract should be useful for studying the molecular mechanisms that regulate rRNA transcription in yeast.