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• W2954061271 abstract "The diatom microalgal Phaeodactylum tricornutum accumulates a large amount of fucoxanthin. Carotenoids hydroxylases (CHYs) play key roles in fucoxanthin biosynthesis in diatoms. However, not any type of CHYs had been identified in P. tricornutum. In this study, two genes (designated Ptrcyp97b1 and Ptrcyp97b2) were cloned, identified and functionally characterized. They shared high sequence identity (50–94 %) with lutein deficient 1-like proteins from other eukaryotes. The typical catalytic active motifs of cytochrome P450s (CYP) were detected in the amino acid sequences of PtrCYP97B1 and PtrCYP97B2. The two genes were probably due to gene duplication. Ptrcyp97b1 and Ptrcyp97b2 transcriptional expression was up-regulated with distinct patterns under high light conditions. The metabolic profiles of the major carotenoids (β-carotene, zeaxanthin, diadinoxanthin, diatoxanthin and fucoxanthin) were determined based on the high performance liquid chromatography method. The fucoxanthin and diatoxanthin contents were increased, while the β-carotene content was decreased. By truncation of the N-terminal trans-membrane anchor or chloroplast transit peptide and addition of a 6 × His-tag, PtrCYP97B1 and PtrCYP97B2 were separately heterologously produced in Escherichia coli and purified by Ni-NTA affinity chromatography. Functional analysis showed that PrtCYP97B2 was able to catalyze the hydroxylation of the β-rings of β-carotene to produce zeaxanthin in β-carotene-accumulating E. coli BL21(DE3) cells. PtrCYP97B1 might have the ability to catalyze the hydroxylation of other substrates other than β-carotene. These results contribute to the further elucidation of xanthophyll biosynthesis in diatoms." @default.
• W2954061271 created "2019-07-12" @default.
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• W2954061271 date "2019-12-01" @default.
• W2954061271 modified "2023-09-28" @default.
• W2954061271 title "Cloning, identification and functional characterization of two cytochrome P450 carotenoids hydroxylases from the diatom Phaeodactylum tricornutum" @default.
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• W2954061271 doi "https://doi.org/10.1016/j.jbiosc.2019.06.008" @default.
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