title: 3'-end formation at the phage lambda tR1 rho-dependent transcription termination site.
abstract: The rho-dependent transcription terminator tR1 of bacteriophage lambda stops RNA synthesis downstream of the major rightward promoter, PR, shortly after the cro gene. Terminated transcripts produced in a purified in vitro transcription system display a heterodisperse set of 3' termini, occurring in clusters located at +290-300, 308-312, 340-345, 385-390, and 440-450 nucleotides from the transcription start site [Morgan, W.D., Bear, D.G., & von Hippel, P.H. (1983) J. Biol. Chem. 258, 9553-9564]. However, transcripts from the same promoter in vivo have been reported to end primarily at +310-312 [Court, D., Brady, C., Rosenberg, M., Wulff, D. L., Behr, M., Mahoney, M., & Izumi, S. (1980) J. Mol. Biol. 138, 231-254]. In order to understand the nature of this discrepancy, we have carried out a comparative analysis of lambda PR transcription products produced in translationally active S30 cell extracts, in a purified in vitro system and in vivo. RNAs from the cell extracts coupled to translation show primarily three PR-derived transcripts beginning at one predominant 5' end and terminating at +263, 308, and 318. Sites +263 and +308 appear to be RNA processing sites. S1 nuclease mapping studies of RNAs produced in vivo show one 5' end and two 3' termini ending at +263 and 311; the +263 site is the predominant 3' end. When transcripts produced in a purified in vitro transcription system are incubated in the S30 cell extract under various conditions, the RNAs are degraded to two primary products with lengths of 263 and 308-311 nt.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Cell Biology, University of New Mexico School of Medicine, Albuquerque 87131.
authors.forename: E A
authors.initials: EA
authors.lastname: Roberts
authors.forename: T L
authors.initials: TL
authors.lastname: Eisenbraun
authors.forename: C L
authors.initials: CL
authors.lastname: Andrews
authors.forename: D G
authors.initials: DG
authors.lastname: Bear
mesh_terms: D010582:Bacteriophage lambda / Q000235:genetics*; D001483:Base Sequence; D004268:DNA-Binding Proteins; D004926:Escherichia coli / Q000235:genetics; D005095:Exoribonucleases; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D011117:Polyribonucleotide Nucleotidyltransferase; D012333:RNA, Messenger / Q000737:chemistry / Q000378:metabolism*; D012097:Repressor Proteins / Q000235:genetics*; D015183:Restriction Mapping; D013728:Terminator Regions, Genetic; D014158:Transcription, Genetic; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins
chemical_list: D004268:DNA-Binding Proteins; D012333:RNA, Messenger; D012097:Repressor Proteins; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; C016649:phage repressor proteins; D011117:Polyribonucleotide Nucleotidyltransferase; D005095:Exoribonucleases; C022535:exoribonuclease II