Pentose metabolism byBacteroides ruminicola subsp.brevis strain B14 |
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Authors: | Dr Daniel R Caldwell Kyle Newman |
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Institution: | (1) Department of Microbiology and Biochemistry, University of Wyoming, University Station, PO Box 3354, 82071 Laramie, Wyoming, USA |
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Abstract: | The fermentation ofd-arabinose byBacteroides ruminicola strain B14 occurs in a manner similar to or identical with that shown previously forl-arabinose metabolism by the organism, a combination of hexose resynthesis and the Embden-Meyerhof sequence. The use ofd-arabinose by strain B14 was repressed by prior growth in medium containingd-glucose and induced by prior growth in the presence ofl-arabinose ord-xylose. The use ofd-ribose andd-xylose by strain B14 is different from that ford-arabinose. During growth in the presence of 1-14C-d-arabinose, labeled acetate, propionate, and succinate were formed, whereas during 1-14C-d-ribose growth only labeled acetate and propionate were obtained. Under the conditions used,d-xylose growth failed to allow formation of acetate, propionate, or succinate. Strain B14 incorporates label from 1- or 2-labeled glycine into acetate, propionate, and succinate by a mechanism involving the cleavage of glycine and equilibration of glycine carbons 1 and 2 with different metabolic pools. |
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