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- W1976048892 abstract "CYP175A1 is a thermostable P450 Monooxygenase from Thermus thermophilus HB27, demonstrating in vivo activity towards beta-carotene. Activity of CYP175A1 was reconstituted in vitro using artificial electron transport proteins. First results were obtained in the mixture with a crude Escherichia coli cell extract at 37 degrees C. In this system, beta-carotene was hydroxylated to beta-cryptoxanthin. The result indicated the presence of electron transport enzymes among the E. coli proteins, which are suitable for CYP175A1. However, upon in vitro reconstitution of CYP175A1 activity with purified recombinant flavodoxin and flavodoxin reductase from E. coli, only very low beta-cryptoxanthin production was observed. Remarkably, with another artificial electron transport system, putidaredoxin and putidaredoxin reductase from Pseudomonas putida, purified CYP175A1 enzyme hydroxylated beta-carotene at 3- and also 3'-positions, resulting in beta-cryptoxanthin and zeaxanthin. Under the optimal reaction conditions, the turnover rate of the enzyme reached 0.23 nmol beta-cryptoxanthin produced per nmol P450 per min." @default.
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- W1976048892 date "2006-01-01" @default.
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- W1976048892 title "Reconstitution of β-carotene hydroxylase activity of thermostable CYP175A1 monooxygenase" @default.
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- W1976048892 doi "https://doi.org/10.1016/j.bbrc.2005.11.023" @default.
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