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. 1990 Jun;172(6):2871–2876. doi: 10.1128/jb.172.6.2871-2876.1990

Continuous-culture study of the regulation of glucose and fructose transport in Kluyveromyces marxianus CBS 6556.

E Postma 1, P J Van den Broek 1
PMCID: PMC209083  PMID: 2160928

Abstract

Regulation of transport of D-glucose and D-fructose was studied in Kluyveromyces marxianus grown in continuous culture. Both substrates could be transported by at least two different transport systems, low-affinity transport and high-affinity proton-sugar symport. The low-affinity transporter, specific for both glucose and fructose, was constitutively present and was apparently not regulated by carbon catabolite repression. Regulation of the activity of the glucose- and fructose-specific proton symport systems appeared to proceed mainly through catabolite repression. Activation of symport did not need the presence of specific inductor molecules in the medium. Nevertheless, the capacities of the proton-sugar symporters varied in cells grown on a wide variety of carbon sources. The possibility that the control of proton symport activity is related to the presence of specific intracellular metabolites is discussed.

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Selected References

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