Abstract:Microorganisms enhance fitness by prioritizing catabolism of available carbon sources using a process known as carbon catabolite repression (CCR). Planktonically grown Pseudomonas aeruginosa is known to prioritize the consumption of organic acids including lactic acid over catabolism of glucose using a CCR strategy termed “reverse diauxie.” P. aeruginosa is an opportunistic pathogen with well-documented biofilm phenotypes that are distinct from its planktonic phenotypes. Reverse diauxie has been described in p… Show more
“…Pseudomonas aeruginosa strain 215 (Pa 215) is a medical isolate from a chronic wound 33 , 34 . Pa 215 was grown in chemically-defined, glucose containing, CSP G medium (materials and methods, supplementary material S1 ).…”
Section: Resultsmentioning
confidence: 99%
“…P. aeruginosa preference for non-fermentable substrates like succinate makes it a secondary resource specialist that requires terminal electron acceptors like O 2 or nitrate 75 . However, O 2 is often limiting in biofilms where cellular O 2 consumption rates are faster than diffusion rates 34 , 76 . P. aeruginosa possesses effective mechanisms to acquire scarce resources like O 2 70 , 77 – 80 .…”
Pseudomonas aeruginosa is a globally-distributed bacterium often found in medical infections. The opportunistic pathogen uses a different, carbon catabolite repression (CCR) strategy than many, model microorganisms. It does not utilize a classic diauxie phenotype, nor does it follow common systems biology assumptions including preferential consumption of glucose with an ‘overflow’ metabolism. Despite these contradictions, P. aeruginosa is competitive in many, disparate environments underscoring knowledge gaps in microbial ecology and systems biology. Physiological, omics, and in silico analyses were used to quantify the P. aeruginosa CCR strategy known as ‘reverse diauxie’. An ecological basis of reverse diauxie was identified using a genome-scale, metabolic model interrogated with in vitro omics data. Reverse diauxie preference for lower energy, nonfermentable carbon sources, such as acetate or succinate over glucose, was predicted using a multidimensional strategy which minimized resource investment into central metabolism while completely oxidizing substrates. Application of a common, in silico optimization criterion, which maximizes growth rate, did not predict the reverse diauxie phenotypes. This study quantifies P. aeruginosa metabolic strategies foundational to its wide distribution and virulence including its potentially, mutualistic interactions with microorganisms found commonly in the environment and in medical infections.
“…Pseudomonas aeruginosa strain 215 (Pa 215) is a medical isolate from a chronic wound 33 , 34 . Pa 215 was grown in chemically-defined, glucose containing, CSP G medium (materials and methods, supplementary material S1 ).…”
Section: Resultsmentioning
confidence: 99%
“…P. aeruginosa preference for non-fermentable substrates like succinate makes it a secondary resource specialist that requires terminal electron acceptors like O 2 or nitrate 75 . However, O 2 is often limiting in biofilms where cellular O 2 consumption rates are faster than diffusion rates 34 , 76 . P. aeruginosa possesses effective mechanisms to acquire scarce resources like O 2 70 , 77 – 80 .…”
Pseudomonas aeruginosa is a globally-distributed bacterium often found in medical infections. The opportunistic pathogen uses a different, carbon catabolite repression (CCR) strategy than many, model microorganisms. It does not utilize a classic diauxie phenotype, nor does it follow common systems biology assumptions including preferential consumption of glucose with an ‘overflow’ metabolism. Despite these contradictions, P. aeruginosa is competitive in many, disparate environments underscoring knowledge gaps in microbial ecology and systems biology. Physiological, omics, and in silico analyses were used to quantify the P. aeruginosa CCR strategy known as ‘reverse diauxie’. An ecological basis of reverse diauxie was identified using a genome-scale, metabolic model interrogated with in vitro omics data. Reverse diauxie preference for lower energy, nonfermentable carbon sources, such as acetate or succinate over glucose, was predicted using a multidimensional strategy which minimized resource investment into central metabolism while completely oxidizing substrates. Application of a common, in silico optimization criterion, which maximizes growth rate, did not predict the reverse diauxie phenotypes. This study quantifies P. aeruginosa metabolic strategies foundational to its wide distribution and virulence including its potentially, mutualistic interactions with microorganisms found commonly in the environment and in medical infections.
“…Pseudomonas aeruginosa strain 215 (Pa 215) is a medical isolate from a chronic wound [36,37]. Pa 215 was grown in chemically-defined, CSP G medium (materials and methods, supplemental material S1).…”
Section: Growth Physiology and Substrate Preference Of Rccrmentioning
confidence: 99%
“…P. aeruginosa preference for non-fermentable substrates like succinate makes it a secondary resource specialist that requires terminal electron acceptors like O2 or nitrate [76,77]. However, O2 is often limiting in biofilms where cellular O2 consumption rates are faster than diffusion rates [37,78]. Lactate has remarkable connections to P. aeruginosa substrate preference and medical niches including diabetic wounds.…”
Section: Substrate Preference Is Consistent With a Resource Utilizatimentioning
Pseudomonas aeruginosa is a globally-distributed bacterium often found in medical infections. The opportunistic pathogen uses a different, carbon catabolite repression (CCR) strategy than many, model microorganisms. It does not utilize a classic diauxie phenotype, nor does it follow common systems biology assumptions including preferential consumption of glucose with an ‘overflow’ metabolism. Despite these contradictions, P. aeruginosa is competitive in many, disparate environments underscoring knowledge gaps in microbial ecology and systems biology. Physiological, omics, and in silico analyses were used to quantify the P. aeruginosa CCR strategy known as ‘reverse diauxie’. An ecological basis of reverse diauxie was identified using a genome-scale, metabolic model interrogated with in vitro omics data. Reverse diauxie preference for lower energy, nonfermentable carbon sources, such as acetate or succinate over glucose, was predicted using a multidimensional strategy which minimized resource investment into central metabolism while completely oxidizing substrates. Application of a common, in silico optimization criterion, which maximizes growth rate, did not predict the reverse diauxie phenotypes. This study quantifies P. aeruginosa metabolic strategies foundational to its wide distribution and virulence.
“…Proteomic analyses have a wide range of applications. Examples include investigating different protein levels in resistant [ 30 ] and drug-tolerant bacterial phenotypes [ 31 ] ( Table 2 ), as well as reports on the bacterial adaptation to different growing conditions and bacterial catabolism [ 32 ], biomarker discovery [ 33 ], and pathogen-host cell interactions [ 34 , 35 ]. In several other studies, different proteome analysis approaches have been employed to study the bacterial response to commonly used antibiotics such as ciprofloxacin [ 36 , 37 , 38 , 39 , 40 ], tobramycin [ 41 , 42 ], colistin [ 43 , 44 , 45 ], polymyxin B [ 46 ], daptomycin [ 47 , 48 ], and silver nanoparticles [ 49 ] ( Table 2 ).…”
For many years, we have tried to use antibiotics to eliminate the persistence of pathogenic bacteria. However, these infectious agents can recover from antibiotic challenges through various mechanisms, including drug resistance and antibiotic tolerance, and continue to pose a global threat to human health. To design more efficient treatments against bacterial infections, detailed knowledge about the bacterial response to the commonly used antibiotics is required. Proteomics is a well-suited and powerful tool to study molecular response to antimicrobial compounds. Bacterial response profiling from system-level investigations could increase our understanding of bacterial adaptation, the mechanisms behind antibiotic resistance and tolerance development. In this review, we aim to provide an overview of bacterial response to the most common antibiotics with a focus on the identification of dynamic proteome responses, and through published studies, to elucidate the formation mechanism of resistant and tolerant bacterial phenotypes.
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