Two complex regions, including a TATA sequence, are required for transcription by RNA polymerase I in Neurospora crassa.
In order to define the RNA polymerase I transcriptional apparatus and how it might interact with regulatory signals, the DNA sequences necessary for 40S rRNA transcription in Neurospora crassa were determined. A systematic set of deletion, substitution and insertion mutations were assayed in a homologous in vitro system. The sequences required for transcription of the gene consist of two large domains (I and II) from -113 to -37, and -29 to +4, respectively. Complete deletion of either domain abolished transcription. Upstream sequences confer a small stimulation of transcription. Domain II includes a TATA sequence at -5 which is sensitive to a small (2 bp) substitution and which is conserved among the large rRNA genes of many organisms. Domain I includes a sequence, termed the 'Ribo box', which is also required for transcription of the Neurospora 5S rRNA genes (1), and which occurs in the 5' region of a Neurospora ribosomal protein gene. The 5S and 40S Ribo boxes are shown to be functionally interchangeable.
Tyler
B M
BM
Department of Plant Pathology, University of California, Davis 95616.
D001483:Base Sequence; D002872:Chromosome Deletion; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics; D008969:Molecular Sequence Data; D009154:Mutation; D009491:Neurospora / Q000235:genetics*; D009492:Neurospora crassa / Q000201:enzymology / Q000235:genetics*; D011401:Promoter Regions, Genetic; D012318:RNA Polymerase I / Q000378:metabolism*; D012335:RNA, Ribosomal / Q000235:genetics; D012341:RNA, Ribosomal, 5S / Q000235:genetics; D014158:Transcription, Genetic
D012335:RNA, Ribosomal; D012341:RNA, Ribosomal, 5S; D012318:RNA Polymerase I