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. 1977 Aug;131(2):672–681. doi: 10.1128/jb.131.2.672-681.1977

Purification and Properties of the Periplasmic Glucose-Binding Protein of Pseudomonas aeruginosa

M W Stinson 1, M A Cohen 1, J M Merrick 1
PMCID: PMC235478  PMID: 407216

Abstract

A glucose-binding glycoprotein (GBP) from the periplasm of Pseudomonas aeruginosa was purified to homogeneity as judged by polyacrylamide gel electrophoresis, molecular sieve chromatography, and double-diffusion gel precipitation. It had an average molecular weight of 44,500 and an isoelectric point of 4.7. One mole of glucose was bound per mole of GBP with a dissociation constant of 0.35 μM. The binding of radioactive glucose by GBP was not significantly inhibited by 10-fold-higher concentrations of other carbohydrates; however, a number of related compounds were found to compete at 100-fold-higher concentrations. Amino acid analyses revealed predominant amounts of alanine, glutamate, and glycine and a low content of sulfur-containing amino acids. The carbohydrate moiety of GBP, comprising nearly 16% of the total weight, contained galactosamine, glucosamine, fucose, galactose, glucose, and mannose. A GBP-deficient mutant, strain MB723, was found to be defective in both membrane transport and glucose chemotaxis. Strain MB724, a revertant to GBP-positive phenotype, simultaneously recovered normal levels of both membrane functions.

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Selected References

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