Journal ArticleDOI
CRISPR/Cas9-Based Counterselection Boosts Recombineering Efficiency in Pseudomonas putida
TLDR
The results presented here upgrade the engineering possibilities of the genome of this environmental bacterium (and possibly other Gram-negatives) to obtain modifications that are otherwise cumbersome to generate.Abstract:
While adoption of single-stranded (ss) DNA recombineering techniques has greatly eased genetic design of the platform strain Pseudomonas putida KT2440, available methods still produce the desired modifications/deletions at low frequencies. This makes isolation of mutants that do not display selectable or conspicuous phenotypes considerably difficult. To overcome this limitation, we have merged ssDNA recombineering with CRISPR/Cas9 technology in this bacterium for efficient killing of unmodified cells and thus non-phenotypic selection of bacteria bearing the mutations of interest. After incorporating the system into standardized pSEVA plasmids we tested its functional efficiency by targeting different types of changes that ranged from single nucleotide substitutions to one-gene deletions—to even the removal a large flagellar cluster (∼69 kb). Simultaneous introduction of two independent gene deletions was tested as well. In all cases, directing the crRNA/Cas9 complexes towards non-modified, wild-type genomic sequences boosted dramatically the appearance of the mutants at stake in the absence of any phenotypic selection. The results presented here upgrade the engineering possibilities of the genome of this environmental bacterium (and possibly other Gram-negatives) to obtain rare modifications that are otherwise cumbersome to generate.read more
Citations
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Pseudomonas putida as a functional chassis for industrial biocatalysis: From native biochemistry to trans-metabolism.
Pablo I. Nikel,Víctor de Lorenzo +1 more
TL;DR: A number of examples are presented for substantiating the worth of P. putida as one of the favorite workhorses for sustainable manufacturing of fine and bulk chemicals in the current times of the 4th Industrial Revolution.
Journal ArticleDOI
CRISPR/Cas9-based Genome Editing in Pseudomonas aeruginosa and Cytidine Deaminase-Mediated Base Editing in Pseudomonas Species
Weizhong Chen,Ya Zhang,Yifei Zhang,Yishuang Pi,Tongnian Gu,Liqiang Song,Yu Wang,Quanjiang Ji +7 more
TL;DR: Application of the two genome editing methods pCasPA/pACRISPR will dramatically accelerate a wide variety of investigations, such as bacterial physiology study, drug target exploration, and metabolic engineering.
Journal ArticleDOI
Elucidating Bacterial Gene Functions in the Plant Microbiome.
TL;DR: In this paper, a review of -omics-based approaches that are propelling forward the current understanding of plantassociated bacterial gene functions, and describe how these technologies have helped unravel key bacterial genes and pathways that mediate pathogenic, beneficial, and commensal host interactions.
Journal ArticleDOI
Genetic tools for reliable gene expression and recombineering in Pseudomonas putida
Taylor B. Cook,Jacqueline M. Rand,Wasti Nurani,Dylan K. Courtney,Sophia A. Liu,Brian F. Pfleger +5 more
TL;DR: A set of inducible promoters are characterized and it is discovered that IPTG-inducible promoter systems have poor dynamic range due to overexpression of the LacI repressor, and a λRed/Cas9 recombineering method is developed that enabled the creation of scarless mutations without the need for performing classic two-step integration and marker removal protocols.
Journal ArticleDOI
Industrial biotechnology of Pseudomonas putida: advances and prospects
TL;DR: The recent advances and prospects in genetic engineering, systems and synthetic biology, and applications of P. putida as a cell factory are summarized and Pseudomonas putida advances to a global industrial cell factory.
References
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A programmable dual-RNA-guided DNA endonuclease in adaptive bacterial immunity.
Martin Jinek,Krzysztof Chylinski,Krzysztof Chylinski,Ines Fonfara,Michael H. Hauer,Jennifer A. Doudna,Emmanuelle Charpentier +6 more
TL;DR: This study reveals a family of endonucleases that use dual-RNAs for site-specific DNA cleavage and highlights the potential to exploit the system for RNA-programmable genome editing.
Journal ArticleDOI
CRISPR provides acquired resistance against viruses in prokaryotes
Rodolphe Barrangou,Christophe Fremaux,Hélène Deveau,Melissa Richards,Patrick Boyaval,Sylvain Moineau,Dennis A. Romero,Philippe Horvath +7 more
TL;DR: It is found that, after viral challenge, bacteria integrated new spacers derived from phage genomic sequences, and CRISPR provided resistance against phages, and resistance specificity is determined by spacer-phage sequence similarity.
Journal ArticleDOI
Cas9–crRNA ribonucleoprotein complex mediates specific DNA cleavage for adaptive immunity in bacteria
TL;DR: It is demonstrated that the Cas9–crRNA complex of the Streptococcus thermophilus CRISPR3/Cas system introduces in vitro a double-strand break at a specific site in DNA containing a sequence complementary to crRNA, paving the way for engineering of universal programmable RNA-guided DNA endonucleases.
Journal ArticleDOI
RNA-guided editing of bacterial genomes using CRISPR-Cas systems
Wenyan Jiang,David Bikard,David Daniel Cox,David Daniel Cox,Feng Zhang,Feng Zhang,Luciano A. Marraffini +6 more
TL;DR: The exhaustively analyze dual-RNA:Cas9 target requirements to define the range of targetable sequences and show strategies for editing sites that do not meet these requirements, suggesting the versatility of this technique for bacterial genome engineering.
Journal ArticleDOI
CRISPR RNA maturation by trans -encoded small RNA and host factor RNase III
Elitza Deltcheva,Krzysztof Chylinski,Krzysztof Chylinski,Cynthia M. Sharma,Karine Gonzales,Yanjie Chao,Zaid Ahmed Pirzada,Maria R. Eckert,Jörg Vogel,Emmanuelle Charpentier,Emmanuelle Charpentier +10 more
TL;DR: In this article, tracrRNA, a trans-encoded small RNA with 24-nucleotide complementarity to the repeat regions of crRNA precursor transcripts, is shown to direct the maturation of crRNAs by the activities of the widely conserved endogenous RNase III and the CRISPR-associated Csn1 protein.