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. 1988 May;54(5):1131–1137. doi: 10.1128/aem.54.5.1131-1137.1988

Production, Distribution, and Kinetic Properties of Inulinase in Continuous Cultures of Kluyveromyces marxianus CBS 6556

Robert J Rouwenhorst 1,*, Leo E Visser 1, Adriaan A Van Der Baan 1, W Alexander Scheffers 1, Johannes P Van Dijken 1
PMCID: PMC202616  PMID: 16347626

Abstract

From a screening of several Kluyveromyces strains, the yeast Kluyveromyces marxianus CBS 6556 was selected for a study of the parameters relevant to the commercial production of inulinase (EC 3.2.1.7). This yeast exhibited superior properties with respect to growth at elevated temperatures (40 to 45°C), substrate specificity, and inulinase production. In sucrose-limited chemostat cultures growing on mineral medium, the amount of enzyme decreased from 52 U mg of cell dry weight−1 at D = 0.1 h−1 to 2 U mg of cell dry weight−1 at D = 0.8 h−1. Experiments with nitrogen-limited cultures further confirmed that synthesis of the enzyme is negatively controlled by the residual sugar concentration in the culture. High enzyme activities were observed during growth on nonsugar substrates, indicating that synthesis of the enzyme is a result of a derepression/repression mechanism. A substantial part of the inulinase produced by K. marxianus was associated with the cell wall. The enzyme could be released from the cell wall via a simple chemical treatment of cells. Results are presented on the effect of cultivation conditions on the distribution of the enzyme. Inulinase was active with sucrose, raffinose, stachyose, and inulin as substrates and exhibited an S/I ratio (relative activities with sucrose and inulin) of 15 under standard assay conditions. The enzyme activity decreased with increasing chain length of the substrate.

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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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