The whole-cell immobilization of D-hydantoinase-engineered Escherichia coli for D-CpHPG biosynthesis
The whole-cell immobilization of D-hydantoinase-engineered Escherichia coli for D-CpHPG biosynthesis
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D-乙内酰脲酶工程化大肠杆菌的全细胞固定化用于 D-CpHPG 生物合成
DOI:
10.1016/j.ejbt.2016.01.004
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发表时间:
2016-05
影响因子:
2.7
通讯作者:
Zhaoyong Yang
中科院分区:
文献类型:
--
作者:
Xiao-zhou Feng;Kang-you Wang;Wei-qing He;Zhaoyong Yang
JIN, Yuan-yuan et al. The whole-cell immobilization of D-hydantoinase-engineered Escherichia coli for D-CpHPG biosynthesis. Electron. J. Biotechnol.[online]. 2016, vol. 19, n. 3, pp. 43-48. ISSN 0717-3458. http://dx. doi. org/10.1016/j. ejbt. 2016.01. 004.Background: D-Hydroxyphenylglycine is considered to be an important chiral molecular building-block of antibiotic reagents such as pesticides, and β-lactam antibiotics. The process of its production is catalyzed by D-hydantoinase and D-carbamoylase in a two-step enzyme reaction. How to enhance the catalytic potential of the two enzymes is valuable for industrial application. In this investigation, an Escherichia coli strain genetically engineered with D-hydantoinase was immobilized by calcium alginate with certain adjuncts to evaluate the optimal condition for the biosynthesis of D-carbamoyl-p-hydroxyphenylglycine (D-CpHPG), the compound further be converted to D-hydroxyphenylglycine (D-HPG) by carbamoylase. Results: The optimal medium to produce D-CpHPG by whole-cell immobilization was a modified Luria-Bertani (LB) added with 3.0%(W/V) alginate, 1.5%(W/V) diatomite, 0.05%(W/V) CaCl 2 and 1.00 mM MnCl 2. The optimized diameter of immobilized beads for the whole-cell biosynthesis here was 2.60 mm. The maximized production rates of D-CpHPG were up to 76%, and the immobilized beads could be reused for 12 batches. Conclusions: This investigation not only provides an effective procedure for biological production of D-CpHPG, but gives an insight into the whole-cell immobilization technology.
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3.8
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通讯作者:
Zhi‐Jun Zhang;Jiang Pan;Chun-Xiu Li;Huilei Yu;G. Zheng;X. Ju;Jian‐He Xu
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影响因子:
3
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