Fig. 5
Effect of the expression level of the cadB gene on lysine/cadaverine biosynthesis in three selected cadA knock-in strains. A Genetic structure for cadA and cadB expression. Three different promoters (PDnaA, P(2Fe–2S)-binding protein, and PmxaF) were employed to diversify the expression level of cadB. Cadaverine (B) and lysine titres (C) in the engineered Methylomonas sp. DH-1 strains. Data indicate mean ± SEM (n = 3)