1989
DOI: 10.1099/00221287-135-7-2005
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Malic Enzyme Activity in Bacteroids from Soybean Nodules

Abstract: ~~~~~~~~~~~~~~~~~~~~~~ ~Soluble extracts of Bradyrhizobium japonicum bacteroids from soybean root nodules showed substantial rates of NAD+ and NADP+ reduction which were malate and MnC12 dependent. Pyruvate was formed stoichiometrically and the NAD-and NADP-dependent rates were additive, indicating the presence of two malic enzymes. The NADP-dependent malic enzyme had a high affinity for malate (apparent K , = 0.1 mM) and was stimulated by ammonium. The NAD-dependent malic enzyme had a lower affinity for malat… Show more

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Cited by 24 publications
(33 citation statements)
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“…PEPC fixes the "C in the C-4 position of OAA. The obvious route to alanine via malic enzyme, which is known to be present in the bacteroids (6,9), would release the label from the C-4 position, generating unlabeled pyruvate and, assuming that alanine is formed by transamination of pyruvate, unlabeled alanine. f3-Decarboxylation of aspartate would also yield unlabeled alanine.…”
Section: Discussionmentioning
confidence: 99%
“…PEPC fixes the "C in the C-4 position of OAA. The obvious route to alanine via malic enzyme, which is known to be present in the bacteroids (6,9), would release the label from the C-4 position, generating unlabeled pyruvate and, assuming that alanine is formed by transamination of pyruvate, unlabeled alanine. f3-Decarboxylation of aspartate would also yield unlabeled alanine.…”
Section: Discussionmentioning
confidence: 99%
“…The assays were started with the addition of extract. Potential interference from malate dehydrogenase activity was controlled for by leaving out MnCl2 from the initial reaction mixture (10). The activity of NADP-malic enzyme of "leaky organelles" in the leucoplast fraction was also determined.…”
Section: Malic Enzyme Assaymentioning
confidence: 99%
“…Enolase activity was measured using an enzymatic-coupled assay and a dual wavelength spectrophotometer (Sigma ZFP22). The assay mixture contained 50 mM Tes (pH 7.5), 0.4 M sorbitol, 10 ,uL) and the absorbance at 340 nm was followed. The proportion of "leaky" leucoplasts was taken as the ratio of the initial enolase activity to that following the disruption of the leucoplasts by adding 10 10 min, pelleted, and resuspended in 0.1 N NaOH.…”
Section: Determination Of Leucoplast Intactnessmentioning
confidence: 99%
See 1 more Smart Citation
“…In this respect, the partial purification of NADP-ME in B. japaonicum J50l from soybean nodules has been reported by this laboratory.5) Some properties of MEs in B. japonicum USDAIIO from soybean nodules have also been reported by Copeland el al. 6) In the present study, NADP-ME was first purified to homogeneity from B. japonicum AlO17, which had high efficiency for nitrogen fixation, and a detailed survey of the molecular characteristics became possible. The enzyme characteristics were surveyed to elucidate the role of this enzyme in nitrogen-fixing nodules, and the N-terminal amino acid sequence was analyzed for gene cloning.…”
mentioning
confidence: 99%