Conversion of disaccharides to 3-ketodisaccharides by nongrowing and immobilized cells ofAgrobacterium tumefaciens |
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Authors: | V Klekner V Löbl E ?ímová M Novák |
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Institution: | (1) Institute of Microbiology, Czechoslovak Academy of Sciences, 142 20 Prague 4 |
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Abstract: | High-performance liquid chromatography was used to estimate 3-ketolactose and 3-ketosucrose in cultures of agrobacteria. The
activities of enzymes that convert the disaccharide substrate were evaluated during batch cultivation ofAgrobacterium tumefaciens on sucrose, maltose, and lactose. The highest activity of glucoside 3-dehydrogenase and a slight activity of disaccharide-hydrolyzing
enzymes were found in cells grown on lactose. Nongrowing cells converted lactose to 3-ketolactose faster than immobilized
cells did. Immobilization of cells into polysaccharide gels did not stabilize the activity of glucoside 3-dehydrogenase. Glutaraldehyde
cross-linking of the cell content led to an inactivation of the respiratory chain but Fe3+ could be used as an electron acceptor. Cells treated with glutaraldehyde converted lactose faster than nongrowing ones but
the activity of glucoside 3-dehydrogenase was not stable. |
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