1.1.5.7 additional information the enzyme is unable to catalyze the reverse reaction of cyclic ketones or aldehydes to cyclic alcohols. This enzyme oxidizes a wide variety of cyclic alcohols. Some minor enzyme activity is found with aliphatic secondary alcohols and sugar alcohols, but not primary alcohols Gluconobacter frateurii ? - ? 89 1.1.5.7 additional information the localization of the enzyme on the outer surface of the organism is advantageous to facilitate the oxidative fermentation of the cyclic alcohols. Since cyclic alcohols have some biological toxicity to living cells, according to the mechanism of the oxidative fermentation, there is no need to incorporate such toxic compounds into the cytoplasm to oxidize and pump out the oxidation products across the cytoplasmic membrane by the expense of bioenergy. The enzyme not inducible Gluconobacter frateurii CHM 9 ? - ? 89 1.1.5.7 additional information the enzyme is unable to catalyze the reverse reaction of cyclic ketones or aldehydes to cyclic alcohols. This enzyme oxidizes a wide variety of cyclic alcohols. Some minor enzyme activity is found with aliphatic secondary alcohols and sugar alcohols, but not primary alcohols Gluconobacter frateurii CHM 9 ? - ? 89 1.1.5.7 ribitol + pyrroloquinoline quinone 34% of the activity compared to cyclopentanol Gluconobacter frateurii ? - ir 406578