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. 1981 Nov;148(2):639–646. doi: 10.1128/jb.148.2.639-646.1981

Isolation of a specific lipoamide dehydrogenase for a branched-chain keto acid dehydrogenase from Pseudomonas putida.

J R Sokatch, V McCully, J Gebrosky, D J Sokatch
PMCID: PMC216250  PMID: 6895373

Abstract

We purified lipoamide dehydrogenase from cells of Pseudomonas putida PpG2 grown on glucose (LPD-glu) and lipoamide dehydrogenase from cells grown on valine (LPD-val), which contained branched-chain keto acid dehydrogenase. LPD-glu had a molecular weight of 56,000 as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and LPD-val had a molecular weight of 49,000. The pH optimum for LPD-glu for reduced nicotinamide adenine dinucleotide oxidation was 7.4, compared with pH 6.5 for LPD-val. When oxidized nicotinamide adenine dinucleotide was included in the assay mixture, the pH optima were 7.1 and 5.7, respectively. There was also a difference in pH optima between the two enzymes for oxidized nicotinamide adenine dinucleotide reduction, but the Michaelis constants and maximum velocities were similar. A purified preparation of branched-chain keto acid dehydrogenase, which was deficient in lipoamide dehydrogenase, was stimulated 10-fold by LPD-val but not by LPD-glu, which suggested that the branched-chain keto acid dehydrogenase of P. putida has a specific requirement for LPD-val. In contrast, a partially purified preparation of 2-ketoglutarate dehydrogenase that was deficient in lipoamide dehydrogenase was stimulated by LPD-glu but not by LPD-val, indicating that this complex has a specific requirement of LPD-glu.

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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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