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d mannuronic acid/fibrose
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Pattern of changes in the activity of enzymes of GDP-D-mannuronic acid synthesis and in the level of transcription of algA, algC and algD genes accompanying the loss and emergence of mucoidy in Pseudomonas aeruginosa.
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The low activity levels of the four GDP-D-mannuronic acid-forming enzymes, even in highly alginate-producing strains of Pseudomonas aeruginosa, have made it difficult to compare enzyme activities accompanying the loss/acquisition of mucoidy. Using optimized conditions, we compared the specific
Effect on Pseudomonas aeruginosa alginate expression of direct plating and culture of fresh cystic fibrosis sputum on to pseudomonas isolation agar containing subinhibitory concentrations of roxithromycin and rifampicin.
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The effects of subinhibitory concentrations of roxithromycin (16 mg/L) or rifampicin (16 mg/L) on alginate production by Pseudomanas aeruginosa were investigated. The weight of purified alginate from antibiotic-free cultures was significantly greater (52.5 +/- 24.0 mg, range 22.4-109.5), compared
The purification and chemical characterisation of the alginate present in extracellular material produced by mucoid strains of Pseudomonas aeruginosa.
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A rapid ion-exchange method has been used to purify the alginate from the extracellular material of mucoid strains of Pseudomonas aeruginosa isolated from the lungs of cystic fibrosis patients. The structure has been investigated by chemical analysis, infrared spectroscopy, paper chromatography, and
Characterization of guanosine diphospho-D-mannose dehydrogenase from Pseudomonas aeruginosa. Structural analysis by limited proteolysis.
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Alginate is believed to be a major virulence factor in the pathogenicity of Pseudomonas aeruginosa in the lungs of patients suffering from cystic fibrosis. Guanosine diphospho-D-mannose dehydrogenase (GDPmannose dehydrogenase, EC 1.1.1.132) is a key enzyme in the alginate biosynthetic pathway which
Purification and characterization of guanosine diphospho-D-mannose dehydrogenase. A key enzyme in the biosynthesis of alginate by Pseudomonas aeruginosa.
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Alginate-producing Pseudomonas aeruginosa are usually associated with the cystic fibrosis lung environment and contribute to the high mortality rates observed among these patients. The present paper describes the purification and enzymatic properties of guanosine diphospho-D-mannose dehydrogenase
[Alginates of Pseudomonas aeruginosa: a complex regulation of the pathway of biosynthesis].
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Pseudomonas aeruginosa is an opportunistic pathogen causing severe infections, especially in lungs of patients with cystic fibrosis. Environmental conditions induce the production by the bacteria of a viscous mucoid exopolysaccharide, called alginate, which is one of the most important factor of
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