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- W2063975863 abstract "Different aldolase activities were demonstrated in cell-free extracts of Aspergillus ustus grown on d-glucose or d-gluconate as the only source of carbon. Pyruvic, oxalacetic, or glycolic acids were used as substrates for enzymatic condensation with different aldehydes. 2-Keto-3-deoxy arabonic acid (KDA) or 2-keto-3-deoxy gluconic acid (KDG) was the product of such condensation. No activity could be detected when glycolic acid, formaldehyde, or acetaldehyde was used as substrate. Maximum pH and temperature were found to be 7.5 and 50°C for KDA aldolase, and 7.0 and 50°C for KDG adolase. Decreased activity was obtained when d-glucose replaced d-gluconate in the fermentation medium. Thermal stability behavior of KDG aldolase indicates that temperature has a stimulating effect on enzyme activity at 50°C. HgCl2, para-mercurychlorobenzoate, ZnSO4, and CuSO4 were potent inhibitors of this enzyme. The Km values were determined for pyruvate and glyceraldehyde and were found to be 4.1 × 10−3 and 7.1 × 10−3m, respectively." @default.
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- W2063975863 date "1989-06-01" @default.
- W2063975863 modified "2023-09-27" @default.
- W2063975863 title "Formation of 2-keto-3-deoxy aldonic acids by cell-free extracts of Aspergillus ustus" @default.
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- W2063975863 doi "https://doi.org/10.1016/0141-0229(89)90021-5" @default.
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