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• W1983238052 abstract "Kinetic studies were carried out for histidine-tagged saccharopine reductase from Saccharomyces cerevisiae at pH 7.0, suggesting a sequential mechanism with ordered addition of reduced nicotinamide adenine dinucleotide phosphate (NADPH) to the free enzyme followed by l-α-aminoadipate-δ-semialdehyde (l-AASA) which adds in rapid equilibrium prior to l-glutamate in the forward reaction direction. In the reverse reaction direction, nicotinamide adenine dinucleotide phosphate (NADP) adds to the enzyme followed by addition of saccharopine. Product inhibition by NADP is competitive vs NADPH and noncompetitive vs α-AASA and l-glutamate, suggesting that the dinucleotide adds to the free enzyme prior to the aldehyde. Saccharopine is noncompetitive vs NADPH, α-AASA, and l-glutamate. In the direction of saccharopine oxidation, NADPH is competitive vs NADP and noncompetitive vs saccharopine, l-glutamate is noncompetitive vs both NADP and saccharopine, while l-AASA is noncompetitive vs saccharopine and uncompetitive vs NADP. The sequential mechanism is also corroborated by dead-end inhibition studies using analogues of AASA, l-glutamate, and saccharopine. 2-Amino-6-heptenoic acid was chosen as a dead-end analogue of l-AASA and is competitive vs AASA, uncompetitive vs NADPH, and noncompetitive vs l-glutamate. α-Ketoglutarate (α-Kg) serves as the dead-end analogue of l-glutamate and is competitive vs l-glutamate and uncompetitive vs L-AASA and NADPH. In the direction of saccharopine oxidation, N-oxalylglycine, l-pipecolic acid, l-leucine, α-ketoglutarate, glyoxylic acid, and l-ornithine were used as dead-end analogues of saccharopine and showed competitive inhibition vs saccharopine and uncompetitive inhibition vs NADP. The equilibrium constant for the reaction was measured at pH 7.0 by monitoring the change in absorbance of NADPH and is 200 M−1. The value is in good agreement with the value determined using the Haldane relationship." @default.
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• W1983238052 date "2008-04-17" @default.
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• W1983238052 title "Overall Kinetic Mechanism of Saccharopine Dehydrogenase (<scp>l</scp>-Glutamate Forming) from Saccharomyces cerevisiae" @default.
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• W1983238052 doi "https://doi.org/10.1021/bi800086g" @default.
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