共 45 条
Enhancement of phenyllactic acid biosynthesis by recognition site replacement of D-lactate dehydrogenase from Lactobacillus pentosus
被引:24
|作者:
Zhu, Yibo
[1
,2
]
Hu, Fagen
[1
,2
,3
]
Zhu, Yingyue
[1
,2
]
Wang, Limei
[1
,2
]
Qi, Bin
[1
,2
]
机构:
[1] Changshu Inst Technol, Sch Biotechnol & Food Engn, Changshu 215500, Jiangsu, Peoples R China
[2] Changshu Inst Technol, Key Lab Food & Biotechnol Suzhou, Changshu 215500, Jiangsu, Peoples R China
[3] Soochow Univ, Sch Biol & Basic Med Sci, Suzhou 215123, Jiangsu, Peoples R China
基金:
中国国家自然科学基金;
关键词:
D-Lactate dehydrogenase;
3-Phenyllactic acid;
Phenylpyruvic acid;
Recognition site residue replacement;
Whole-cell transformation;
PHENYLPYRUVIC ACID;
BIOTRANSFORMATION;
CONVERSION;
SUBSTRATE;
SPECTRUM;
FORMATE;
D O I:
10.1007/s10529-015-1778-4
中图分类号:
Q81 [生物工程学(生物技术)];
Q93 [微生物学];
学科分类号:
071005 ;
0836 ;
090102 ;
100705 ;
摘要:
The Tyr52 residue of d-lactate dehydrogenase (d-LDH) from Lactobacillus pentosus was replaced with small hydrophobic residues and overexpressed in E. coli BL21 (DE3) to enhance 3-phenyllactic acid (PLA) synthesis by whole-cell catalyst. Escherichia coli pET-28a-d-ldh produced 12.2 g PLA l(-1) in 3 h, with a molar conversion rate of 61 %, while E. coli pET-28a-d-ldh (Y52V) produced 15.6 g PLA l(-1), with a molar conversion rate of 77 %. This study demonstrates the feasibility of using engineered E. coli for PLA production from phenylpyruvate (PPA) and showed that site-directed mutagenesis of d-ldh markedly improved PLA yield and substrate conversion rate. This biocatalytic system is a promising platform for PLA production from PPA.
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页码:1233 / 1241
页数:9
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