title: An antisense RNA that governs the expression kinetics of a multifunctional virulence gene.
abstract: Genome-wide transcriptome analyses of several bacterial species have recently uncovered a hitherto unappreciated amount of antisense transcription. However, the physiological role, regulation and significance of such antisense transcripts are presently unclear. We now report the identification of a cis-encoded 1.2 kb long antisense RNA - termed AmgR - that is complementary to the mgtC portion of the mgtCBR polycistronic message from Salmonella enterica. The mgtCBR mRNA specifies the MgtC protein, which is necessary for survival within macrophages, virulence in mice and growth in low Mg(2+); the Mg(2+) transporter MgtB with no apparent role in virulence; and the membrane peptide MgtR mediating MgtC degradation. Expression of AmgR diminished both MgtC and MgtB protein levels in a process requiring RNase E but independent of RNase III, the RNA chaperone Hfq, and the regulatory peptide MgtR. Inactivation of the chromosomal amgR promoter increased MgtC and MgtB protein levels and enhanced Salmonella virulence. Surprisingly, AmgR transcription is governed by the regulatory protein PhoP, which also directs transcription of the sense mgtCBR mRNA. AmgR may function as a timing device that alters MgtC and MgtB levels after the onset of PhoP-inducing conditions.
authors.affiliation: Department of Molecular Microbiology, Howard Hughes Medical Institute, Washington University School of Medicine, Campus Box 8230, 660 S. Euclid Ave., St. Louis, MO 63110, USA.
authors.forename: Eun-Jin
authors.initials: EJ
authors.lastname: Lee
authors.forename: Eduardo A
authors.initials: EA
authors.lastname: Groisman
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics*; D000595:Amino Acid Sequence; D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D027682:Cation Transport Proteins / Q000235:genetics*; D015964:Gene Expression Regulation, Bacterial; D051379:Mice; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D020871:RNA Stability; D016372:RNA, Antisense / Q000235:genetics / Q000378:metabolism*; D012486:Salmonella typhimurium / Q000235:genetics* / Q000472:pathogenicity; D014774:Virulence / Q000235:genetics
chemical_list: D001426:Bacterial Proteins; D027682:Cation Transport Proteins; D016372:RNA, Antisense; C061064:PhoP protein, Bacteria; D000251:Adenosine Triphosphatases; C083836:MgtB protein, Salmonella typhimurium; C093586:MgtC protein, Salmonella typhimurium
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