Abstract
Aminophosphonic acids analogous to glutamic acid, aspartic acid, alanine, and valine were actively accumulated by Lactobacillus plantarum. Uptake was dependent on the availability of glucose and, in all cases, the estimated intracellular concentrations substantially exceeded extracellular levels. During uptake, there was little metabolism of tritiated 2-amino-3-phosphonopropionic acid (APP), the aspartic acid analogue, and a negligible incorporation of isotope from this substance into the nucleic acid, lipid, protein, or cell wall fractions of the cell. Competition studies with APP indicated that its transport in L. plantarum and in Streptococcus faecalis was antagonized only by structurally related compounds such as glutamic, aspartic, and cysteic acids. Kinetic studies showed that APP was taken up by a single catalytic system in S. faecalis. A mutant strain of this organism which lacks one of two kinetically distinguishable dicarboxylic amino acid transport systems failed to accumulate measurable amounts of APP. These experiments indicate that the aminophosphonic acids are accumulated by the amino acid transport systems in these bacteria with minimal metabolic changes.
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Selected References
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