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- W1488894520 abstract "alpha-Pinene oxide is an intermediate in the degradation of alpha-pinene by Nocardia sp. strain P18.3 and some Pseudomonas strains. The epoxide is cleaved by a lyase which catalyzes a concerted reaction in which both rings of the bicyclic structure are cleaved with the formation of cis-2-methyl-5-isopropylhexa-2,5-dienal. The enzyme has been purified to homogeneity from Nocardia sp. strain P18.3. It was induced by growth with alpha-pinene and constituted 6 to 7% of the soluble protein of cell extracts. The apparent molecular weight of the native enzyme was 50,000 by ultracentrifugal analysis. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis gave two dissimilar subunits with apparent molecular weights of 17,000 and 22,000. The enzyme was devoid of prosthetic groups, had no cofactor requirement, and had a broad pH activity range, a Km for alpha-pinene oxide of 9 microM, and a turnover number of 15,000. Inhibitors included sulfhydryl reactive compounds, terpene epoxides, and pinane derivatives with substituent groups at carbon 3. A mechanism for the concerted reaction has been proposed in which decyclization is initiated by donation of a proton from the catalytic center to the oxygen of the epoxide with consequent destabilization. In vitro the enzyme was inactivated during catalysis, and a reactive cationic intermediate may be responsible for this phenomenon. The enzyme should be classified as a lyase EC 4.99.-.-." @default.
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- W1488894520 date "1987-11-01" @default.
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- W1488894520 title "Purification and properties of alpha-pinene oxide lyase from Nocardia sp. strain P18.3" @default.
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- W1488894520 doi "https://doi.org/10.1128/jb.169.11.4980-4983.1987" @default.
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