Cited by 41Microbial Metabolic Engineering and BioproductionBacterial Genetics and BiotechnologyCRISPR and Genetic Engineering

Construction of a restriction-less, marker-less mutant useful for functional genomic and metabolic engineering of the biofuel producer Clostridium acetobutylicum

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Croux, Christian, Nguyen, Ngoc-Phuong-Thao, Lee, Jieun, Raynaud, Céline, Saint-Prix, Florence, Gonzalez-Pajuelo, Maria, Meynial-Salles, Isabelle, Soucaille, Philippe·2016·Biotechnology for Biofuels

Abstract

BACKGROUND: Clostridium acetobutylicum is a gram-positive, spore-forming, anaerobic bacterium capable of converting various sugars and polysaccharides into solvents (acetone, butanol, and ethanol). The sequencing of its genome has prompted new approaches to genetic analysis, functional genomics, and metabolic engineering to develop industrial strains for the production of biofuels and bulk chemicals. RESULTS: The method used in this paper to knock-out or knock-in genes in C. acetobutylicum combines the use of an antibiotic-resistance gene for the deletion or replacement of the target gene, the subsequent elimination of the antibiotic-resistance gene with the flippase recombinase system from Saccharomyces cerevisiae, and a C. acetobutylicum strain that lacks upp, which encodes uracil phosphoribosyl-transferase, for subsequent use as a counter-selectable marker. A replicative vector containing (1) a pIMP13 origin of replication from Bacillus subtilis that is functional in Clostridia, (2) a replacement cassette consisting of an antibiotic resistance gene (MLS (R) ) flanked by two FRT sequences, and (3) two sequences homologous to selected regions around target DNA sequence was first constructed. This vector was successfully used to consecutively delete the Cac824I restriction endonuclease encoding gene (CA_C1502) and the upp gene (CA_C2879) in the C. acetobutylicum ATCC824 chromosome. The resulting C. acetobutylicum Δcac1502Δupp strain is marker-less, readily transformable without any previous plasmid methylation and can serve as the host for the "marker-less" genetic exchange system. The third gene, CA_C3535, shown in this study to encode for a type II restriction enzyme (Cac824II) that recognizes the CTGAAG sequence, was deleted using an upp/5-FU counter-selection strategy to improve the efficiency of the method. The restriction-less marker-less strain and the method was successfully used to delete two genes (ctfAB) on the pSOL1 megaplasmid and one gene (ldhA) on the chromosome to get strains no longer producing acetone or l-lactate. CONCLUSIONS: The restriction-less, marker-less strain described in this study, as well as the maker-less genetic exchange coupled with positive selection, will be useful for functional genomic studies and for the development of industrial strains for the production of biofuels and bulk chemicals.

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  • Several counter-selectable markers to allow efficient screening for the rare second recombination event have been developed for clostridia, including upp, mazF, codA, and pyrE or pyrF.

    “To facilitate this method, several counter-selectable markers to allow efficient screening for the rare second recombination event have been developed for clostridia including upp (encoding a uracil-phosphoribosyl-transferase) (Soucaille et al., 2008; Croux et al., 2016), mazF (E. coli toxin) (Al-Hinai et al., 2012a), codA (cytosine deaminase) (Cartman et al., 2012), and pyrE or pyrF (orotate”

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Authors
Croux, C., Nguyen, N.-P.-T., Lee, J., Raynaud, C., Saint-Prix, F., Gonzalez-Pajuelo, M., Meynial-Salles, I., & Soucaille, P.
Affiliations
  • Institut National des Sciences Appliquées de Toulouse (FR)
  • Korea University (KR)
  • METabolic Explorer (France) (FR)
Corresponding author
Soucaille, Philippe
Venue
Biotechnology for Biofuels
Published
2016-02-02
Volume
9
Issue
1
Pages
23-23
ISSN
1754-6834 (ISSN-L)
OpenAlex
W2261829810
Cited by
41
References
33
Citations by year
2025: 1 · 2024: 2 · 2023: 2 · 2022: 3 · 2021: 6 · 2020: 1 · 2019: 3 · 2018: 10 · 2017: 8 · 2016: 5
FWCI
4.51
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Biotechnology for Biofuels (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
Funders
Seventh Framework Programme (PEOPLE-ITN-2008-237942)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
Keywords
Clostridium acetobutylicum, gene deletion, gene replacement, uracil phosphoribosyltransferase, antibiotic resistance genes, type II restriction enzymes, counter-selection, acetone production, L-lactate production, functional genomics, metabolic engineering

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