1887

Abstract

To elucidate the regulatory mechanism for propionate production in , the molecular properties and gene expression of phosphoenolpyruvate carboxykinase (Pck) and pyruvate kinase (Pyk) were investigated. The Pck was deduced to consist of 538 aa with a molecular mass of 596 kDa, and appeared to exist as a monomer. The Pyk was revealed to consist of four identical subunits consisting of 469 aa with a molecular mass of 513 kDa. Both Mg and Mn were required for the maximal activity of Pck, and Pck utilized ADP, not GDP or IDP, as a substrate. Either Mg or Mn was required for Pyk activity, and the enzyme was activated by phosphoenolpyruvate (PEP) and fructose 1,6-bisphosphate (FBP). Pyk activity was severely inhibited by P, but restored by the addition of FBP. The value of Pck for PEP (055 mM) was nearly equal to the value of Pyk for PEP, suggesting that the partition of the flow from PEP in the fermentation pathways is determined by the activity ratio of Pck to Pyk. Both and genes were monocistronic, although two transcriptional start sites were found in . The level of mRNA was not different whether glucose or lactate was the energy substrate. However, the mRNA level was 12-fold higher when grown on lactate than on glucose. The level of mRNA was inversely related to the sufficiency of energy, suggesting that Pck synthesis is regulated at the transcriptional level when energy supply is altered. It was conceivable that the transcription of in is triggered by PEP and suppressed by ATP.

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2001-03-01
2020-07-14
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