Constitutive and high gene expression in the diaminopimelate pathway accelerates ε-poly-L-lysine production in Streptomyces albulus.
J Antibiot (Tokyo)
; 76(9): 522-531, 2023 09.
Article
em En
| MEDLINE
| ID: mdl-37308604
ABSTRACT
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.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polilisina
/
Streptomyces
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
J Antibiot (Tokyo)
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
Japão