Codon-Optimized NADH Oxidase Gene Expression and Gene Fusion with Glycerol Dehydrogenase for Bienzyme System with Cofactor Regeneration.

Codon-Optimized NADH Oxidase Gene Expression and Gene Fusion with Glycerol Dehydrogenase for Bienzyme System with Cofactor Regeneration.
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密码子优化的 NADH 氧化酶基因表达以及与甘油脱氢酶的基因融合,用于具有辅因子再生的双酶系统。

DOI:
10.1371/journal.pone.0128412
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Wang S
Wang S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Fang B;Jiang W;Zhou Q;Wang S

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NADH oxidases (NOXs) play an important role in maintaining balance of NAD+/NADH by catalyzing cofactors regeneration. The expression of nox gene from Lactobacillus brevis in Escherichia coli BL21 (BL21 (DE3)) was studied. Two strategies, the high AT-content in the region adjacent to the initiation codon and codon usage of the whole gene sequence consistent with the host, obtained the NOX activity of 59.9 U/mg and 73.3 U/mg (crude enzyme), with enhanced expression level of 2.0 and 2.5-folds, respectively. Purified NOX activity was 213.8 U/mg. Gene fusion of glycerol dehydrogenase (GDH) and NOX formed bifuctional multi-enzymes for bioconversion of glycerol coupled with coenzyme regeneration. Kinetic parameters of the GDH-NOX for each substrate, glycerol and NADH, were calculated as V max(Glycerol) 20 μM/min, K m(Glycerol) 19.4 mM, V max (NADH) 12.5 μM/min and K m (NADH) 51.3 μM, respectively, which indicated the potential application of GDH-NOX for quick glycerol analysis and dioxyacetone biosynthesis.
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