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Pedraz, Lucas; Blanco‐Cabra, Núria; Torrents, Eduard
The FASEB journal, February 2020, 2020-Feb, 2020-02-00, 20200201, Letnik: 34, Številka: 2Journal Article
Many notable human pathogens are facultative anaerobes. These pathogens exhibit redundant metabolic pathways and a whole array of regulatory systems to adapt to changing oxygen levels. However, our knowledge of facultative anaerobic pathogens is mostly based on fully aerobic or anaerobic cultures, which does not reflect real infection conditions, while the microaerobic range remains understudied. Here, we examine the behavior of pathogenic and nonpathogenic strains of two facultative anaerobes, Escherichia coli and Pseudomonas aeruginosa, during the aerobic‐anaerobic transition. To do so, we introduce a new technique named AnaeroTrans, in which we allow self‐consumption of oxygen by steady‐state cultures and monitor the system by measuring the gas‐phase oxygen concentration. We explore the different behavior of the studied species toward oxygen and examine how this behavior is associated with the targeted infection sites. As a model, we characterize the adaptation profile of the ribonucleotide reductase network, a complex oxygen‐dependent enzymatic system responsible for the generation of the deoxyribonucleotides. We also explore the actions of the most important anaerobic regulators and how these regulators influence bacterial fitness. Our results allow us to classify the different elements that compose the aerobic‐anaerobic transition into reproducible stages, thus showing the different adaptation mechanisms of the studied species.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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