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Biotechnol Lett. 2015 Apr;37(4):799-806. doi: 10.1007/s10529-014-1753-5. Epub 2014 Dec 17.

Enhanced cadaverine production from L-lysine using recombinant Escherichia coli co-overexpressing CadA and CadB.

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1
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, People's Republic of China, will1015@hotmail.com.

Abstract

The effect of fusing the PelB signal sequence to lysine/cadaverine antiporter (CadB) on the bioconversion of L-lysine to cadaverine was investigated. To construct a whole-cell biocatalyst for cadaverine production, four expression plasmids were constructed for the co-expression of lysine decarboxylase (CadA) and lysine/cadaverine antiporter (CadB) in Escherichia coli. Expressing CadB with the PelB signal sequence increased cadaverine production by 12%, and the optimal expression plasmid, pETDuet-pelB-CadB-CadA, contained two T7 promoter-controlled genes, CadA and the PelB-CadB fusion protein. Based on pETDuet-pelB-CadB-CadA, a whole-cell system for the bioconversion of L-lysine to cadaverine was constructed, and three strategies for L-lysine feeding were evaluated to eliminate the substrate inhibition problem. A cadaverine titer of 221 g l(-1) with a molar yield of 92% from lysine was obtained.

PMID:
25515797
DOI:
10.1007/s10529-014-1753-5
[Indexed for MEDLINE]
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