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[1,1-T]-ethanol,:1,1-T]-propanol and [1,1-T]-butanol exhibit small isotope effects (kH/kT=1.3-1.8) in the liver alcohol dehydrogenase catalyzed reaction NAD® + alcohol ⇌aldehyde +NADH+H®. Presence of semicarbazide (with [1,1-T] -ethanol) or substrat inhibition (with [1,1-T] -butanol, 2.10 -2 -m.) raises the isotope effect (up to 4.1 at 25 °C) by introducing partial irreversibility to the interconversion step of the ternary complexes. This is in agreement with the Theorell-Chance mechanism as extended by DALZIEL. Thus, isotope effect determinations confirm both, the presence of ternary complexes and their kinetic insignificance for lower aliphatic substrates.

zeitschrift für naturforschung b

Untersuchungen zur Reaktion der Alkoholdehydrogenasen mit Tritium-markierten Substraten: III. Primäre aliphatische Alkohole und Aldehyde als Substrate der Alkoholdehydrogenase aus Leber