热稳定性
赖氨酸
大肠杆菌
互补
链霉菌
生物
基因
拉伤
生物化学
链霉菌科
基因表达
酶
分子生物学
氨基酸
放线菌
细菌
遗传学
突变体
解剖
作者
Fumihito Hasebe,Kazuya Adachi,Kazuya Yamanaka,Tadao Oikawa,Chitose Maruyama,Yoshimitsu Hamano
标识
DOI:10.1038/s41429-023-00636-9
摘要
Streptomyces albulus NBRC14147 produces a homopoly(amino acid), ε-poly-L-lysine (ε-PL). Due to its antibiotic activity, thermostability, biodegradability, and non-toxicity to humans, ε-PL is used as a food preservative. In this study, homology searches of diaminopimelate (DAP) pathway genes (dapB and dapE), in an S. albulus genome database, were shown to encode predicted enzymes using dapB or dapE in Escherichia coli strain complementation assays. We observed that dapB and dapE transcriptional levels were weak during ε-PL production stages. Therefore, we strengthened this expression using an ermE constitutive promoter. Engineered strains generated faster growth and ε-PL production rates when compared with the control strain. Moreover, maximum ε-PL yields in S. albulus, where dapB was constitutively expressed, were approximately 14% higher when compared with the control strain. These findings showed that enhanced lysine biosynthetic gene expression generated faster and higher ε-PL production levels.
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