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Cotranscription of two genes necessary for ribosomal protein L11 methylation (prmA) and pantothenate transport (panF) in Escherichia coli K-12.

Institut de Biologie Physico-Chimique, (URA 1139), Centre National de la Recherche Scientifique, Paris, France.

ABSTRACT

Genetic complementation and enzyme assays have shown that the DNA region between panF, which encodes pantothenate permease, and orf1, the first gene of the fis operon, encodes prmA, the genetic determinant for the ribosomal protein L11 methyltransferase. Sequencing of this region identified one long open reading frame that encodes a protein of 31,830 Da and corresponds to the prmA gene. We found, both in vivo and in vitro, that prmA is expressed from promoters located upstream of panF and thus that the panF and prmA genes constitute a bifunctional operon. We located the major 3' end of prmA transcripts 90 nucleotides downstream of the stop codon of prmA in the DNA region upstream of the fis operon, a region implicated in the control of the expression of the fis operon. Although no promoter activity was detected immediately upstream of prmA, S1 mapping detected 5' ends of mRNA in this region, implying that some mRNA processing occurs within the bicistronic panF-prmA mRNA.

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