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Engineering Citrobacter freundii using CRISPR/Cas9 system

Journal Article · · Journal of Microbiological Methods

The CRISPR/Cas9 (clustered regularly interspaced short palindromic repeats/CRISPR associated proteins) system is a useful tool to edit genomes quickly and efficiently. However, the use of CRISPR/Cas9 to edit bacterial genomes has been limited to select microbial chassis primarily used for bioproduction of high value products. Thus, expansion of CRISPR/Cas9 tools to other microbial organisms is needed. Here, our aim was to assess the suitability of CRISPR/Cas9 for genome editing of the Citrobacter freundii type strain ATCC 8090. We evaluated the commonly used two plasmid pCas/pTargetF system to enable gene deletions and insertions in C. freundii and determined editing efficiency. The CRISPR/Cas9 based method enabled high editing efficiency (~91%) for deletion of galactokinase (galk) and enabled deletion with various single guide RNA (sgRNA) sequences. To assess the ability of CRISPR/Cas9 tools to insert genes, we used the fluorescent reporter mNeonGreen, an endopeptidase (yebA), and a transcriptional regulator (xylS) and found successful insertion with high efficiency (81-100%) of each gene individually. These results strengthen and expand the use of CRISPR/Cas9 genome editing to C. freundii as an additional microbial chassis.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; US Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1885753
Report Number(s):
PNNL-SA-173650
Journal Information:
Journal of Microbiological Methods, Journal Name: Journal of Microbiological Methods Vol. 200; ISSN 0167-7012
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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