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The Gram‐positive bacterium Bacillus subtilis encounters nutrient limitations and osmotic stress in its natural soil ecosystem. To ensure survival and sustain growth, highly integrated adaptive responses are required. Here, we investigated the system‐wide response of B. subtilis to different, simultaneously imposed stresses. To address the anticipated complexity of the cellular response networks,...
The gamma‐glutamyl‐phosphate reductase (ProA) interlinks both the anabolic and osmostress adaptive proline biosynthetic routes of Bacillus subtilis. Because no paralogous protein to ProA exists in this microorganism, proA mutants should exhibit a tight proline auxotrophic growth phenotype. Contrary to expectations, proA mutants formed microcolonies on agar plates lacking proline and faster growing...