Nontypeable Haemophilus influenzae Carbonic Anhydrase Is Important for Environmental and Intracellular Survival
SourceJournal of Bacteriology, 195, 12, (2013), pp. 2737-2746
Article / Letter to editor
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Paediatrics - OUD tm 2017
Laboratory of Genetic, Endocrine and Metabolic Diseases
Journal of Bacteriology
SubjectMolecular Biology; N4i 1: Pathogenesis and modulation of inflammation NCMLS 1: Infection and autoimmunity; NCMLS 4: Energy and redox metabolism
Nontypeable Haemophilus influenzae (NTHi) is one of the leading causes of noninvasive mucosal infections, such as otitis media, sinusitis, and conjunctivitis. During its life cycle, NTHi is exposed to different CO2 levels, which vary from approximately 0.04% in ambient air during transmission to a new host to over 5% in the respiratory tract and tissues of the human host during colonization and disease. We used the next-generation sequencing Tn-seq technology to identify genes essential for NTHi adaptation to changes in environmental CO2 levels. It appeared that H. influenzae carbonic anhydrase (HICA), which catalyzes the reversible hydration of CO2 to bicarbonate, is a molecular factor that is conditionally essential for NTHi survival in ambient air. Growth of NTHi Deltacan strains was restored under 5% CO2-enriched conditions, by supplementation of the growth medium with sodium bicarbonate, or by genetic complementation with the can gene. Finally, we showed that HICA not only is essential for environmental survival but also appeared to be important for intracellular survival in host cells. Hence, HICA is important for NTHi niche adaptation.
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