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. 1978 Nov;136(2):757–764. doi: 10.1128/jb.136.2.757-764.1978

Consequences of aspartase deficiency in Yersinia pestis.

L A Dreyfus, R R Brubaker
PMCID: PMC218602  PMID: 711677

Abstract

Growing cells of Yersinia pseudotuberculosis, but not those of closely related Yersinia pestis, rapidly destroyed exogenous L-aspartic and L-glutamic acids, thus prompting a comparative study of dicarboxylic amino acid catabolism. Rates of amino acid metabolism by resting cells of both species were determined at pH 5.5, 7.0, and 8.5. Regardless of pH, Y. pseudotuberculosis destroyed L-glutamic acid, L-glutamine, L-aspartic acid, and L-asparagine at rates greater than those observed for Y. pestis. Although rates of proline degardation were similar, its metabolism by Y. pestis at pH 8.5 resulted in excretion of glutamic and aspartic acids. Similarly, Y. pestis excreted aspartic acid when incubated with L-glutamic acid (pH 8.5) or L-asparagine (pH 5.5, 7.0, and 8.5). Aspartase activity was not detected in extracts of 10 strains of Y. pestis but was present in all 11 isolates of Y. pseudotuberculosis. The latter contained significantly more glutaminase, asparaginase, and L-glutamate-oxalacetate transminase activity than did extracts of Y. pestis; specific activities of L-glutamate dehydrogenase and alpha-ketoglutarate dehydrogenase were similar. The observed differences in dicarboxylic amino acid metabolism are traceable to asparatase deficiency in Y. pestis and may account for the slow doubling time of this organism relative to Y. pseudotuberculosis.

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Selected References

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