Abstract
The pathway of l-sorbose metabolism in Agrobacterium tumefaciens strain B6 was determined to be: l-sorbose → d-glucitol (sorbitol) → d-fructose → d-fructose-6-phosphate → d-glucose-6-phosphate. The reduction of l-sorbose and the oxidation of d-glucitol were mediated by NADPH- and NAD+-linked oxidoreductases, respectively. The intermediates, d-glucitol and d-fructose, were isolated from in vitro reaction mixtures by column chromatography on Dowex 1-borate, and identified enzymatically. d-Fructose was identified chemically by its 1H-NMR spectrum and the IR spectrum and the melting point of the fructosazone. d-Glucitol was characterized chemically by the melting point and the IR spectrum of its hexaacetate.
A. tumefaciens ICPB TT111, a representative of another genetic race of Agrobacterium, lacked l-sorbose reductase and therefore failed to grow on l-sorbose; it grew normally on d-glucitol.
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Van Keer, C., Kersters, K. & De Ley, J. l-Sorbose metabolism in Agrobacterium tumefaciens . Antonie van Leeuwenhoek 42, 13–24 (1976). https://doi.org/10.1007/BF00399445
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DOI: https://doi.org/10.1007/BF00399445