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. 1984 Aug;75(4):1158–1162. doi: 10.1104/pp.75.4.1158

Enzymes of the Poly-β-Hydroxybutyrate and Citric Acid Cycles of Rhizobium japonicum Bacteroids 1

Dale B Karr 1, James K Waters 1, Fumiko Suzuki 1, David W Emerich 1
PMCID: PMC1067068  PMID: 16663750

Abstract

The activities of several enzymes of the citric acid and poly-β-hydroxybutyrate cycles were measured in Rhizobium japonicum 3I1B-143 bacteroids which had been isolated from soybean nodules by sucrose gradient centrifugation. During the period of developing nitrogenase activity, the specific activity of fumarase, hydroxybutyrate dehydrogenase, β-ketothiolase, and pyruvate dehydrogenase complex increased whereas acetoacetate-succinyl-CoA transferase and isocitrate dehydrogenase decreased. Malate dehydrogenase activity remained constant. The amount of available acetyl-CoA, based on pyruvate dehydrogenase activity, should be sufficient to support both metabolic cycles concurrently. The temporal relationship between nitrogenase activity and poly-β-hydroxybutyrate accumulation has been reexamined.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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