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. 1982 Mar;149(3):864–871. doi: 10.1128/jb.149.3.864-871.1982

delta1-piperideine-2-carboxylate reductase of Pseudomonas putida.

C W Payton, Y F Chang
PMCID: PMC216472  PMID: 6801013

Abstract

Pseudomonas putida metabolizes D-lysine to delta 1-piperideine-2-carboxylate and L-pipecolate. The second step of this catabolic pathway is catalyzed by delta 1-piperideine-2-carboxylate reductase. This enzyme was isolated and purified from cells grown on DL-lysine as substrate. The enzyme was very unstable, resulting in low recovery of activity and low purity after a six-step purification procedure. The enzyme had a pH optimum of 8.0 to 8.3. The Km values for delta 1-piperideine-2-carboxylate and NADPH were 0.23 and 0.13 mM, respectively. NADPH at concentrations above 0.15 mM was inhibitory to the enzyme. Delta 1-pyrroline-5-carboxylate, pyroglutamate, and NADH were poor substrates or coenzyme for delta 1-piperideine-2-carboxylate reductase. The enzyme reaction from delta 1-piperideine-2-carboxylate to L-pipecolate was irreversible. EDTA, sodium pyrophosphate, and dithiothreitol at concentrations of 1 mM protected the enzyme during storage. The enzyme was inhibited almost totally by Zn2+, Mn2+, Hg2+ Co2+, and p-chloromercuribenzoate at concentrations of 0.1 mM. The enzyme had a molecular weight of about 200,000. Both D-lysine and L-lysine were good inducers for the enzyme. Neither delta1-piperideine-2-carboxylate nor L-pipecolate was an effective inducer for the enzyme. P. putida cells grew on D-lysine only after a 5- to 8-h lag, which could be abolished by adding a supplement of 0.01% alpha-ketoglutarate or other readily metabolizable compounds. Such a supplement also converted the noncoordinate induction of this enzyme and pipecolate oxidase, both of the D-lysine pathway, to coordinacy. However, this effect was not observed if the enzyme pair was from different pathways of lysine metabolism in this organism (i.e., the D- and L-lysine pathways).

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Selected References

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