Studies on the transcription complex of Escherichia coli RNA polymerase.
To study the chain elongation phase of enzymatic RNA synthesis ternary transcription complexes with T7 DNA or poly[dA) - (dT)] as template were isolated by gel exclusion chromatography. The DNA in these complexes contains single-stranded regions which are recognized by a single-strand-specific nuclease from Neurospora crassa. The non-codogenic DNA strand in the poly[(dA) - (dT)] ternary complex is preferentially hydrolysed by the nuclease. The polymerase protects predominantly the codogenic strand in this complex from digestion by DNAse I. In the T7 DNA ternary complex a DNA fragment with a chain length of approximately 26 nucleotides and an RNA fragment of about 22 nucleotides are protected by polymerase from digestion by DNAse and RNAse.
D003090:Coliphages; D004277:DNA, Single-Stranded / Q000378:metabolism; D004279:DNA, Viral / Q000378:metabolism; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism; D007700:Kinetics; D008954:Models, Biological; D009690:Nucleic Acid Conformation; D011067:Poly dA-dT / Q000378:metabolism; D014158:Transcription, Genetic
D004277:DNA, Single-Stranded; D004279:DNA, Viral; D011067:Poly dA-dT; D012321:DNA-Directed RNA Polymerases