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A bottom-up approach towards a bacterial consortium for the biotechnological conversion of chitin to l-lysine

  • 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 GlcNAc2, chitin deacetylase to convert GlcNAc2 into GlcN2 and acetate, and glucosaminidase to cleave GlcN2 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 GlcNAc2 or GlcN2 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.

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Metadaten
Author:Marina Vortmann, Anna K. Stumpf, Elvira SgobbaORCiD, Mareike E. Dirks-HofmeisterORCiD, Martin Krehenbrink, Volker F. WendischORCiD, Bodo PhilippORCiD, Bruno M. MoerschbacherORCiD
Title (English):A bottom-up approach towards a bacterial consortium for the biotechnological conversion of chitin to l-lysine
URN:urn:nbn:de:bsz:959-opus-39664
DOI:https://doi.org/10.1007/s00253-021-11112-5
Parent Title (English):Applied Microbiology and Biotechnology
Document Type:Article
Language:English
Year of Completion:2021
Release Date:2023/04/24
Tag:Chitin; Corynebacterium glutamicum; Cross-feeding; Escherichia coli; Microbial consortia; N-acetylglucosamine
Volume:105
Issue:4
First Page:1547
Last Page:1561
Faculties:Fakultät AuL
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 610 Medizin, Gesundheit
Review Status:Veröffentlichte Fassung/Verlagsversion
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International