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0343220078
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Matsumoto, K.1
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25
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0343655665
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note
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Homogenates of the cultured cells of M. polymorpha in 100 mM phosphate buffer (pH 7.0) were centrifuged at 100 000 g to give a cell-free extract, which was treated with ammonium sulfate (60-80% satd) to give a crude enzyme preparation. Butyl-Toyopearl column chromatography of the crude enzyme preparation gave a good separation of the two different esterases. Further purification by chromatography on a diethylaminoethyl-Toyo-pearl column and then a Sephadex G-75 column gave homogeneous esterases as judged by SDS-PAGE: esterase I, molecular mass ca. 54 000, dimeric form composed of two identical 27 000 subunits; esterase II, molecular mass ca. 45 000, dimeric form composed of two identical 22 500 subunits.
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26
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0343655664
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note
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8
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28
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0343220073
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note
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In a typical experiment 2-methylcyclohexanone enol acetate 1 (5 mg) and Triton X-100 (5 mg) were dissolved in 2 ml of the sodium phosphate buffer containing enzyme (pH 7.0). The mixture was shaken at 300 rpm and 35°C. After 0.5 h the reaction mixture was extracted with n-pentane and the product was identified by direct comparison with the authentic sample by GLC and GC-MS analyses. The other substrates (2-7) were subjected to the enzymatic hydrolysis by the same procedure. It was confirmed that neither non-enzymatic hydrolysis nor racemization of the product occurred under the incubation conditions.
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29
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0343655663
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note
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288 +278 (c 0.15, MeOH). The CD data of the products (11, 15-17) could not be obtained due to the low transformation rate and the lack of the products.
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31
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Meyers, A. I.; Williams, D. R.; Erickson, G. W.; White, S.; Druelinger, M. J. Am. Chem. Soc. 1981, 193, 3081.
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Meyers, A.I.1
Williams, D.R.2
Erickson, G.W.3
White, S.4
Druelinger, M.5
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32
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0002271091
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Djerassi, C.; Hart, P. A.; Beard, C. J. Am. Chem. Soc. 1964, 86, 85.
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J. Am. Chem. Soc.
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Djerassi, C.1
Hart, P.A.2
Beard, C.3
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33
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0002178462
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Djerassi, C.; Hart, P. A.; Warawa, E. J. J. Am. Chem. Soc. 1964, 86, 78.
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J. Am. Chem. Soc.
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Djerassi, C.1
Hart, P.A.2
Warawa, E.J.3
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34
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0343655660
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note
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-1). Retention times for the products in the GLC were as follows: 8 and 15, 11.8 and 12.8 min; 9 and 16, 12.7 and 12.9 min; 10 and 17, 23.8 and 24.0 min; 11 and 18, 18.1 and 18.4 min; 12 and 19, 27.7 and 27.9 min; 13 and 20, 72.1 and 72.8 min; 14 and 21, 60.1 and 61.2 min.
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