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Biochim Biophys Acta. 1975 Jan 23;377(1):42-51.

Lysine-ketoglutarate reductase in human tissues.


Lysine-ketoglutarate reductase (saccharopine dehydrogenase (NADP+, lysine-forming) EC from human liver has been partially purified and characterized. A spectrophotometric assay is described. The Michaelis constants have been determined for lysine (1.5-10-3 M), alpha-ketoglutarate (1-10-3 M) and NADPH (8-10-5 M). The pH optimum is 7.8. The enzyme is product inhibited. The specificity of the enzyme, response to inhibitors, pH and thermal stability are reported. Lysine-ketoglutarate reductase is present in high concentration in liver and heart, to a lesser degree in kidney and skin and in trace amounts in several other tissues. Saccharopine dehydrogenase (saccharopine dehydrogenase (NAD+, L-glutamate-forming) EC was demonstrable only in liver and kidney. Lysine-ketoglutarate reductase reacts effectively with delta-hydroxylysine.

[Indexed for MEDLINE]

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