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Volume 143, Issue 5

Increased pyruvate orthophosphate dikinase activity results in an alternative gluconeogenic pathway in Free

Abstract

The formation of phosphoenolpyruvate (PEP) is a major step in the gluconeogenic pathway in which tricarboxylic acid (TCA) cycle intermediates are converted to hexose sugars. In (now this step is catalysed by the enzyme PEP carboxykinase (PCK) which converts oxaloacetate to PEP. Pckmutants grow very poorly with TCA cycle intermediates as the sole source of carbon. Here, the isolation and mapping of suppressor mutations which allow Pckmutants to grow on succinate and other TCA cycle intermediates is reported. Tn insertions which abolished the suppressor phenotype and mapped to the suppressor locus were located within the pod gene encoding pyruvate orthophosphate dikinase (PPDK). Strains carrying suppressor mutations had increased PPDK activity compared to the wild-type. The suppressor phenotype was dependent on the combined activities of malic enzyme and PPDK, which thus represent an alternative route for the formation of PEP in PPDK activity was not required for symbiotic N fixation.

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Keyword(s): gluconeogenesus , pyruvate orthophosphate dikinase and Rhizobium (Sinorhizobium) meliloti
© Society Society for General Microbiology 1997
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1997-05-01
2024-04-25
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Increased pyruvate orthophosphate dikinase activity results in an alternative gluconeogenic pathway in Rhizobium (Sinorhizobium) meliloti
Microbiology 143, 1639 (1997); https://doi.org/10.1099/00221287-143-5-1639
/content/journal/micro/10.1099/00221287-143-5-1639
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