Abstract

Saccharopine [ϵ- N-( l-glutaryl-2)- l-lysine] has been found to occur in normal, untreated mouse liver. The pool of saccharopine as well as that of α-aminoadipate become labeled shortly after the administration of l-lysine-U- 14C into intact mouse. In vitro experiments using the mouse liver homogenate have shown that l-lysine is converted to saccharopine in the presence of α-ketoglutarate and NADPH, and saccharopine to α-aminoadipate in the presence of NAD +. The oxidation of α-aminoadipic-δ-semialdehyde (Δ 1-piperideine-6-carboxylate), the proposed reaction product of saccharopine cleavage, to α-aminoadipate is effected by either NAD + or NADP +.

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