| Abstrakt: |
Salmonella typhimuriumpossesses at least three inducible transport systems for the tricarboxylic acids (citric, isocitric, cis-aconitic, and tricarballylic). The first system was induced by citrate, isocitrate, or cis-aconitate, and transported citric acid and isocitric acid. The second system was also induced by the same acids as in the first system and transported cis-aconitic acid. This system required Mg2+ions and was stable at pH 8.4 but unstable at pH 7.0. The metal ion was replaced with Sr2+or Ca2+ions but not with Ba2+ions. The third system was induced by tricarballylate and transported citric acid, cis-aconitic acid, and tricarballylic acid. |
