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• W2080403208 abstract "Cytokinin oxidase/dehydrogenase (CKO/CKX) is a flavoenzyme, which irreversibly inactivates cytokinins by severing the isoprenoid side chain from the adenine/adenosine moiety. There are several genes coding for the enzyme in maize (Zea mays). A Z. mays CKO1 cDNA was cloned in the yeast Yarrowia lipolytica to achieve heterologous protein expression. The recombinant ZmCKO1 was recovered from cultures of transformed yeasts and purified using several chromatographic steps. The enzyme was obtained as a homogeneous protein in a remarkably high-yield and its molecular and kinetic properties were characterized. The enzyme showed a molecular mass of 69 kDa, pI was 6.3. Neutral sugar content of the molecule was 22%. Absorption and fluorescence spectra were in accordance with the presence of FAD as a cofactor. Peptide mass fingerprinting using MALDI-MS correctly assigned the enzyme in MSDB protein database. The enzyme showed a relatively high degree of thermostability (T50=55 degrees C for 30 min incubation). The following pH optimum and K(m) values were determined for natural substrates (measured in the oxidase mode): pH 8.0 for isopentenyl adenine (K(m)=0.5 microM), pH 7.6 for isopentenyl adenosine (K(m)=1.9 microM), pH 7.9 for zeatin (K(m)=1.5 microM) and pH 7.3 for zeatin riboside (K(m)=2.0 microM). ZmCKO1, functioning in the oxidase mode, catalyzes the production of one molecule of H2O2 per one molecule of cytokinin substrate. This finding represents clear evidence for the existence of dual enzyme functionality (oxygen serves as a cosubstrate in the absence of better electron acceptors)." @default.
• W2080403208 created "2016-06-24" @default.
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• W2080403208 date "2005-11-01" @default.
• W2080403208 modified "2023-10-18" @default.
• W2080403208 title "High-level expression and characterization of Zea mays cytokinin oxidase/dehydrogenase in Yarrowia lipolytica" @default.
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• W2080403208 doi "https://doi.org/10.1016/j.biochi.2005.04.006" @default.
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