Genome Engineering of Paenibacillus

Genome Engineering of Paenibacillus

1. Background Introduction

Paenibacillus is a plant-growth-promoting rhizobacterium rated as Generally Recognized as Safe (GRAS) by the US Food and Drug Administration (FDA), boasting broad application prospects in the fields of agriculture, medicine, industry and environmental bioremediation. Its prominent plant-growth-promoting activity, capacity for producing broad-spectrum antimicrobial metabolites and excellent environmental adaptability have established its core position in biological control, industrial enzyme preparation and synthetic biology. Precise and efficient gene editing technology is a pivotal tool for exploring its biological resource potential and constructing high-performance engineering strains.

Against this backdrop, GeneRulor has developed a CRISPR/Cas9-based approach for genomic modification of Paenibacillus, which can customarily achieve target gene knockout, large-fragment deletion, point mutation, gene integration (overexpression) and other services in different strains, with the delivery of positive mutant strains. We are committed to providing professional and reliable customized Paenibacillus gene editing solutions for scientific research and industrial clients worldwide.

2. Strain Characteristics and Biological Background

(1) Gram-staining property: Paenibacillus is a Gram-positive bacterium, with several species such as Paenibacillus polymyxa being the most extensively studied representative strains.

(2) Physical characteristics: It has a thick peptidoglycan cell wall and is capable of forming endospores with extremely strong stress resistance. Its genomic GC content has a wide variation range (40-55%), with diverse metabolic pathways that enable the production of a variety of antimicrobial peptides, hydrolases and polysaccharides.

(3) Industrial significance: As a model genus of plant-growth-promoting rhizobacteria (PGPR), it is an ideal model for investigating biological control, plant-growth-promoting mechanisms and the synthesis of antimicrobial metabolites. It is widely used in industry for the production of antimicrobial peptides, industrial enzymes and bioremediation materials.

(4) Genetic transformation: It has multiple transformation approaches, including penicillin-mediated transformation, electroporation and magnesium amino acid-mediated transformation. With the development of shuttle plasmids, promoters and CRISPR tools, the genetic manipulation system has been increasingly improved.

Figure 1 Growth of Paenibacillus on culture medium plates

3. Reported Editing Strategies in Literatures

Aiming at the transformation challenges of Paenibacillus, the mainstream editing strategies adopted in current literatures and scientific research practices include:

3.1 CRISPR/Cas9 System (Mainstream Protocol) :

(1) Principle: The Cas9 protein mediates site-specific cleavage of the target genomic DNA under the guidance of sgRNA, inducing double-strand break repair.

(2) Advantages: It enables precise deletion of 12-41 kb large gene clusters, with the efficiency of multiplex gene editing reaching over 80% and the efficiency of double-locus integration up to 58%. It is suitable for gene knockout, point mutation and large-fragment integration.

3.2 Homologous Recombination System:

Suicide plasmids carrying homologous arms are constructed to realize gene replacement or knockout by utilizing the endogenous recombination system of Paenibacillus.

3.3 Transformation Efficiency Optimization:

For different Paenibacillus strains, the transformation barrier caused by the thick cell wall is overcome by optimizing electroporation parameters, penicillin pretreatment or magnesium amino acid-mediated transformation.

4. Core Application Fields

(1) Biological control and agricultural applications: Enhance the capacity for antimicrobial peptide synthesis through gene editing, optimize the antagonistic activity against plant pathogenic bacteria, and construct high-efficiency biocontrol strains.

(2) Cell factory construction: Redirect the synthetic flux of major fermentation products such as the 2,3-butanediol pathway to the production of target compounds (e.g., isobutanol) through metabolic pathway optimization.

(3) Synthetic biology modification: Integrate heterologous synthetic operons to construct a new generation of microbial chassis for the high-efficiency production of industrial enzymes, surfactants and antimicrobials.

(4) Environmental bioremediation: Enhance the degradation capacity of strains for toxic substances in wastewater and soil through gene knock-in, expanding the scope of its environmental bioremediation applications.

5. Project Process and Verification

We provide one-stop services from design to delivery to ensure the accuracy of editing results:

(1) Protocol design and vector construction: Design knockout vectors for target loci.

(2) Bacterial transformation and screening: Introduce the editing system by natural transformation or electroporation technology.

(3) Multiple verification: Confirm positive mutations through PCR identification and Sanger sequencing.

Figure 2 Schematic diagram of the project process

6. Introduction to Gene Editing Projects

6.1 Core Services

(1) Gene knockout/inactivation: Precisely delete protease genes or metabolic byproduct genes to optimize chassis performance.

(2) Gene knock-in/overexpression: Integrate exogenous expression cassettes at specific loci or enhance the expression of endogenous rate-limiting enzymes.

(3) Point mutation/modification: Perform site-directed mutation on key enzymes to improve their thermal stability or catalytic activity.

(4) Multiplex gene editing: Conduct consecutive editing of multiple genes to construct strains with modified complex metabolic networks.

6.2 Technical Advantages

(1) High success rate: Rich experience in editing industrial strains and laboratory model strains.

(2) Customized design: Design the optimal editing strategy according to production objectives (e.g., enzyme activity enhancement, growth improvement).

(3) Full-process verification: Provide a complete closed-loop report from protocol design to final genotype confirmation.

7. Case Introduction

We have successfully provided services for many top universities, research institutions and biotechnology companies at home and abroad, with a partial example presented as follows:

Case: Construction of Paenibacillus mutant strains

Project content: Successful integration of exogenous gene fragments

Figure 3 Verification of transposon strains by single colony picking of Paenibacillus

(Upper panel: Verification of resistance gene insertion; Lower panel: Verification of plasmid existence)

8. References

[1] Yuan P, et al. Microbial cell factories using Paenibacillus:statusand perspectives. Crit Rev Biotechnol. 2024 Nov;44(7):1386-1402..

[2] Yuan P, et al. From Biocontrol to Synthesis: InnovativeProgress of Paenibacillus inMechanism Analysis, Gene Editingand Platform Construction. Int J Mol Sci. 2025Nov 10;26(22):10886.

[3] Grady EN, et al. Current knowledge and perspectives ofPaenibacillus: a review.Microb Cell Fact. 2016 Dec 1;15(1):203.

[4] Ravagnan G, et al. CRISPR-Cas9-Mediated Genome Editing inPaenibacilluspolymyxa. Methods Mol Biol. 2024;2760:267-280.

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