Objective To improve the production of welan gum and obtain a carotenoid-free strain while reducing the fermentation and post-treatment costs. Results The vitreoscilla globin (vgb) gene combined with the β-galactosidase (lacZ) promoter was inserted into the phytoene synthase (crtB) gene region of the chromosome in Alcaligenes sp. ATCC31555. When the recombinant strain was grown in a 5 l fermentor,...
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