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. 1989 Dec;171(12):6808–6814. doi: 10.1128/jb.171.12.6808-6814.1989

Characterization of sugar uptake in wild-type Streptomyces clavuligerus, which is impaired in glucose uptake, and in a glucose-utilizing mutant.

M Garcia-Dominguez 1, J F Martin 1, P Liras 1
PMCID: PMC210580  PMID: 2687256

Abstract

Wild-type Streptomyces clavuligerus NRRL 3585 is unable to utilize glucose. A glucose-utilizing (gut-1) mutant of S. clavuligerus NRRL 3585 has been obtained by N-methyl-N'-nitro-N-nitrosoguanidine mutagenesis. The gut-1 mutant is able to grow on glucose or galactose, while the wild type is unable to catabolize these hexoses. Similar binding affinities of glucose by cells of the wild type and the gut-1 mutant were found, but the wild type was unable to complete glucose transport. A soluble intracellular ATP-dependent (but not phosphoenolpyruvate-dependent) glucokinase activity was found both in the wild type and the gut-1 mutant. The gut-1 mutant has acquired a functional transport system that allows transport of glucose, 2-deoxyglucose, and galactose, as shown by hexose competition experiments. The gut-1 transport system concentrates glucose inside the cell at least 10- to 20-fold and is strongly inhibited by respiratory inhibitors, which prevent the establishment of a proton motive force, and by proton-conducting ionophores, suggesting that it is energized by a proton motive force. The new transport system is not completely sugar specific (transporting galactose and glucose through the same system), as opposed to the hexose-specific system reported in wild-type Streptomyces griseus.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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