title: Mutational analysis of the Chlamydia trachomatis rRNA P1 promoter defines four regions important for transcription in vitro.
abstract: We have characterized the Chlamydia trachomatis ribosomal promoter, rRNA P1, by measuring the effect of substitutions and deletions on in vitro transcription with partially purified C. trachomatis RNA polymerase. Our analyses indicate that rRNA P1 contains potential -10 and -35 elements, analogous to Escherichia coli promoters recognized by E-sigma70. We identified a novel AT-rich region immediately downstream of the -35 region. The effect of this region was specific for C. trachomatis RNA polymerase and strongly attenuated by single G or C substitutions. Upstream of the -35 region was an AT-rich sequence that enhanced transcription by C. trachomatis and E. coli RNA polymerases. We propose that this region functions as an UP element.
authors.affiliation: Department of Medicine, University of California, San Francisco 94143-0654, USA.
authors.forename: M
authors.initials: M
authors.lastname: Tan
authors.forename: T
authors.initials: T
authors.lastname: Gaal
authors.forename: R L
authors.initials: RL
authors.lastname: Gourse
authors.forename: J N
authors.initials: JN
authors.lastname: Engel
mesh_terms: D001483:Base Sequence; D002692:Chlamydia trachomatis / Q000235:genetics*; D004252:DNA Mutational Analysis; D004926:Escherichia coli / Q000235:genetics; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D012329:RNA, Bacterial / Q000235:genetics*; D012335:RNA, Ribosomal / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D012329:RNA, Bacterial; D012335:RNA, Ribosomal