Partial purification and characterization of a polymannuronic acid depolymerase produced by a mucoid strain of Pseudomonas aeruginosa isolated from a patient with cystic fibrosis.

  • Dunne W
  • Buckmire F
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Abstract

An exopolysaccharide depolymerase was isolated from a mucoid strain of Pseudomonas aeruginosa of cystic fibrosis origin. Purified preparations of the depolymerase showed maximum activity against the unacetylated polymannuronic acid exopolysaccharide from the same strain and little activity against commercially prepared alginic acid. The evidence suggests that the enzyme is either periplasmic in location or associated with the outer cell membrane and is released extracellularly, in the absence of cell lysis, after a reduction of the culture magnesium (Mg2+) concentration below 3.0 mM. The depolymerase is also released after the addition of sublethal concentrations of EDTA to cultures containing 3.0 mM Mg2+. A survey of additional mucoid P. aeruginosa isolates recovered from patients with cystic fibrosis showed that nearly 60% demonstrated similar depolymerase activity while none of the nonmucoid revertants of the parent strains produced detectable depolymerase activity.

Author-supplied keywords

  • Alginates
  • Alginates: metabolism
  • Cell Membrane
  • Cell Membrane: enzymology
  • Cystic Fibrosis
  • Cystic Fibrosis: microbiology
  • Edetic Acid
  • Edetic Acid: pharmacology
  • Glucosephosphate Dehydrogenase
  • Glucosephosphate Dehydrogenase: metabolism
  • Glucuronic Acid
  • Glycoside Hydrolases
  • Glycoside Hydrolases: isolation & purification
  • Glycoside Hydrolases: metabolism
  • Hexuronic Acids
  • Humans
  • Kinetics
  • Magnesium
  • Magnesium: pharmacology
  • Molecular Weight
  • Potassium Chloride
  • Potassium Chloride: pharmacology
  • Pseudomonas Infections
  • Pseudomonas Infections: microbiology
  • Pseudomonas aeruginosa
  • Pseudomonas aeruginosa: enzymology
  • Pseudomonas aeruginosa: isolation & purification
  • Pseudomonas aeruginosa: physiology
  • Sodium Chloride
  • Sodium Chloride: pharmacology
  • Substrate Specificity

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Authors

  • W M Dunne

  • F L Buckmire

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