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• W3128798859 abstract "Abstract Chitin is an abundant waste product from shrimp and mushroom industries and as such, an appropriate secondary feedstock for biotechnological processes. However, chitin is a crystalline substrate embedded in complex biological matrices, and, therefore, difficult to utilize, requiring an equally complex chitinolytic machinery. Following a bottom-up approach, we here describe the step-wise development of a mutualistic, non-competitive consortium in which a lysine-auxotrophic Escherichia coli substrate converter cleaves the chitin monomer N -acetylglucosamine (GlcNAc) into glucosamine (GlcN) and acetate, but uses only acetate while leaving GlcN for growth of the lysine-secreting Corynebacterium glutamicum producer strain. We first engineered the substrate converter strain for growth on acetate but not GlcN, and the producer strain for growth on GlcN but not acetate. Growth of the two strains in co-culture in the presence of a mixture of GlcN and acetate was stabilized through lysine cross-feeding. Addition of recombinant chitinase to cleave chitin into GlcNAc 2 , chitin deacetylase to convert GlcNAc 2 into GlcN 2 and acetate, and glucosaminidase to cleave GlcN 2 into GlcN supported growth of the two strains in co-culture in the presence of colloidal chitin as sole carbon source. Substrate converter strains secreting a chitinase or a β-1,4-glucosaminidase degraded chitin to GlcNAc 2 or GlcN 2 to GlcN, respectively, but required glucose for growth. In contrast, by cleaving GlcNAc into GlcN and acetate, a chitin deacetylase-expressing substrate converter enabled growth of the producer strain in co-culture with GlcNAc as sole carbon source, providing proof-of-principle for a fully integrated co-culture for the biotechnological utilization of chitin. Graphical abstract Key Points • A bacterial consortium was developed to use chitin as feedstock for the bioeconomy. • Substrate converter and producer strain use different chitin hydrolysis products. • Substrate converter and producer strain are mutually dependent on each other." @default.
• W3128798859 created "2021-02-15" @default.
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• W3128798859 date "2021-02-01" @default.
• W3128798859 modified "2023-09-26" @default.
• W3128798859 title "A bottom-up approach towards a bacterial consortium for the biotechnological conversion of chitin to l-lysine" @default.
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• W3128798859 doi "https://doi.org/10.1007/s00253-021-11112-5" @default.
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