Acinetobacter baumannii Fatty Acid Desaturases Facilitate Survival in Distinct Environments

Felise G. Adams, Alaska Pokhrel, Erin B. Brazel, Lucie Semenec, Liping Li, Claudia Trappetti, James C. Paton, Amy K. Cain, Ian T. Paulsen, Bart A. Eijkelkamp

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Maintaining optimal fluidity is essential to ensure adequate membrane structure and function under different environmental conditions. We apply integrated molecular approaches to characterize two desaturases (DesA and DesB) and define their specific roles in unsaturated fatty acid (UFA) production in Acinetobacter baumannii. Using a murine model, we reveal DesA to play a minor role in colonization of the respiratory tract, whereas DesB is important during invasive disease. Furthermore, using transcriptomic and bioinformatic analyses, a global regulator involved in fatty acid homeostasis and members of its regulon are characterized. Collectively, we show that DesA and DesB are primary contributors to UFA production in A. baumannii with infection studies illustrating that these distinct desaturases aid in the bacterium's ability to survive in multiple host niches. Hence, this study provides novel insights into the fundamentals of A. baumannii lipid biology, which contributes to the versatility of this critical bacterial pathogen.

    Original languageEnglish
    Number of pages8
    JournalACS Infectious Diseases
    Early online date8 Jun 2021
    DOIs
    Publication statusE-pub ahead of print - 8 Jun 2021

    Keywords

    • bacterial lipid homeostasis
    • global regulator
    • host-pathogen interactions
    • infection
    • unsaturated fatty acid production

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