Utilization ofd-amino acids byFusobacterium nucleatum andFusobacterium varium |
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Authors: | M Ramezani S E MacIntosh Dr R L White |
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Institution: | (1) Department of Chemistry, Dalhousie University, B3H 4J3 Halifax, Nova Scotia, Canada |
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Abstract: | Summary The utilization ofd- andl -amino acids with acidic, basic or polar side chains was demonstrated by HPLC. Two species of the anaerobeFusobacterium utilized D-lysine and the L isomers of glutamate, glutamine, histidine, lysine and serine. OnlyF. varium usedl-arginine,d-glutamate andd-serine as substrates, whereasF. nucleatum specifically utilizedd-histidine andd-glutamine.d-Glutamate accumulated in F. nucleatum cultures supplemented withd-glutamine, and ornithine was detected when eitherdl- orl-arginine was included inF. varium cultures. Based on literature precedents,d-glutamate andd-histidine are isomerized to their L isomers prior to degradation, but separate catabolic pathways are possible for each enantiomer of lysine and serine. |
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Keywords: | Amino acids Anaerobic bacteria Catabolism HPLC Stereochemistry |
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