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Related Experiment Videos

Two phenotypically compensating isocitrate dehydrogenases in Ralstonia eutropha.

Zheng-Xiang Wang1, Christian Brämer, Alexander Steinbüchel

  • 1Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Corrensstrabetae 3, 48149, Münster, Germany. steinbu@uni-muenster.de

FEMS Microbiology Letters
|October 22, 2003
PubMed
Summary

Two isocitrate dehydrogenase (IDH) genes, icd1 and icd2, were identified in Ralstonia eutropha HF39. IDH1 is induced by acetate, and both IDH1 and IDH2 are crucial for polyhydroxybutyrate accumulation.

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Area of Science:

  • Microbiology
  • Metabolic Engineering
  • Biochemistry

Background:

  • Isocitrate dehydrogenase (IDH) and isocitrate lyase regulate metabolic flux between the TCA cycle and glyoxylate shunt.
  • Understanding these enzymes is key to controlling microbial metabolism.

Purpose of the Study:

  • To identify and characterize the two IDH genes (icd1 and icd2) in Ralstonia eutropha HF39.
  • To investigate the roles of IDH1 and IDH2 in R. eutropha metabolism, particularly concerning acetate utilization and polyhydroxybutyrate production.

Main Methods:

  • Gene identification and characterization of icd1 and icd2 in R. eutropha HF39.
  • Functional expression of icd1 and icd2 in Escherichia coli.
  • Construction and phenotypic analysis of interposon mutants (HF39Deltaicd1 and HF39Deltaicd2).

Related Experiment Videos

  • Measurement of IDH activity and growth rates on acetate.

    • Main Results:

    • R. eutropha HF39 possesses two IDH genes, icd1 and icd2.
    • Icd1 was functionally expressed in E. coli, while icd2 showed no activity.
    • HF39Deltaicd1 retained 43% of IDH activity, not induced by acetate; HF39Deltaicd2 showed 74% of acetate-induced IDH activity.
    • Both mutants exhibited similar growth rates on acetate and accumulated poly(3-hydroxybutyric acid) as the wild-type.

    Conclusions:

    • IDH1 is induced by acetate in R. eutropha.
    • Both IDH1 and IDH2 contribute to the regulation of metabolic flux and are essential for poly(3-hydroxybutyric acid) accumulation.