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Moraxella catarrhalis causes otitis media in children and exacerbations of chronic obstructive pulmonary disease in adults. Together, these two conditions contribute to enormous morbidity and mortality worldwide. The oligopeptide permease (opp ) ABC transport system is a nutritional virulence factor important for the utilization of peptides. The substrate binding protein OppA, which binds peptides for uptake, is a potential vaccine antigen, but little was known about the regulation of gene expression. The fiveopp genesoppB ,oppC ,oppD ,oppF , andoppA are in the same open reading frame. Sequence analysis predicted two promoters, one located upstream ofoppB and one within the intergenic region betweenoppF andoppA . We have characterized the gene cluster as an operon with two functional promoters and show that cold shock at 26°C for ≤0.5 h and the presence of a peptide substrate increase gene transcript levels. Additionally, the putative promoter upstream ofoppA contributes to the transcription ofoppA but is not influenced by the same environmental cues as the promoter upstream ofoppB . We conclude that temperature and nutrient availability contribute to the regulation of the Opp system, which is an important nutritional virulence factor inM. catarrhalis .

Expression of the Oligopeptide Permease Operon of Moraxella catarrhalis Is Regulated by Temperature and Nutrient Availability