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. 1988 Jul;170(7):3262–3268. doi: 10.1128/jb.170.7.3262-3268.1988

Promoter of the Mycoplasma pneumoniae rRNA operon.

H C Hyman 1, R Gafny 1, G Glaser 1, S Razin 1
PMCID: PMC211279  PMID: 2838465

Abstract

RNA transcripts starting from the 5' end of the single Mycoplasma pneumoniae rRNA operon were analyzed by several methods. By primer extension analysis a start site was found 62 nucleotides upstream from the start site of the 16S rRNA. This site was preceded by a putative Pribnow box; however, a defined -35 recognition region was absent. The cloned rRNA operon was transcribed in vitro by using purified RNA polymerase of Escherichia coli. A single start site could be demonstrated within a few nucleotides of the start site found by primer extension analysis of M. pneumoniae transcripts. When fragments from the cloned operon were used as hybridization probes, S1 nuclease mapping yielded a single transcript extending approximately 193 nucleotides upstream from the 16S rRNA start site. The region surrounding this endpoint did not resemble any known promoter sequence. Dot blot hybridization of M. pneumoniae RNA to three oligonucleotides consisting of nucleotides -5 to -21, -38 to -54, and -112 to -132 (from the start of the 16S rRNA gene) indicated that most rRNA transcripts were processed at the stem site preceding the 16S rRNA gene. The majority of the longer precursor transcripts, extending beyond this point, did not extend further upstream to an oligonucleotide consisting of nucleotides -112 to -132. It was concluded that transcription of the rRNA operon of M. pneumoniae is initiated by a single promoter. The nucleotide sequence of the region is presented.

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