Klebsiella pneumoniae

Klebsiella pneumoniae Genome Editing Service

1.Research Background

Klebsiella pneumoniae is a clinically common Gram-negative opportunistic pathogen. With the emergence of carbapenem-resistant K. pneumoniae (CRKP) and hypervirulent K. pneumoniae (hvKp), research into its drug resistance and pathogenicity mechanisms has become a central challenge in the field of public health. Precise and efficient gene-editing technology is a crucial tool for in-depth exploration of its functional genomics and for developing novel antimicrobial drug targets and vaccine strategies.

In this context, GeneRulor offers microbial genome modification services using the CRISPR/Cas9 system. This enables customized gene knockout, large-fragment deletion, point mutation, and gene integration services across different serotypes of Klebsiella pneumoniae, delivering high-purity positive mutant strains. The service is committed to providing professional and reliable customized Klebsiella pneumoniae genome editing solutions for global research and industrial clients.

2.Strain Characteristics and Biological Background

(1) Gram-staining property: Klebsiella pneumoniae is a Gram-negative bacterium.

(2) Physical characteristics: Its most notable feature is a thick polysaccharide capsule, which serves as the primary barrier for evading host immunity and contributes to difficulties in transformation.

(3) Clinical significance: It commonly causes pneumonia, urinary tract infections, and sepsis. In particular, the prevalence of antimicrobial resistance (e.g., KPC-type carbapenemase) has made it a key model for studying resistance mechanisms.

(4) Metabolism and applications: It exhibits strong environmental survivability and is an important chassis for studying biofilm formation, capsule synthesis, and metabolic engineering (e.g., 1,3-propanediol production).

Figure 1. Growth of Klebsiella pneumoniae on LB Agar Plates

3.Gene-Editing Strategies Reported in the Literature

To address the low transformation efficiency caused by the K. pneumoniae capsule and interference from endogenous restriction-modification systems, mainstream strategies currently include:

3.1 CRISPR/Cas9 System (Primary Solution):

(1) Principle: Utilizes the Cas9 protein to perform site-specific cleavage of the target genomic DNA under the guidance of an sgRNA.

(2) Advantage: Induces repair via double-strand breaks (DSBs), enabling highly efficient gene knockout, large-fragment deletion, or gene knock-in.

3.2 Homologous Recombination:

Often employed in conjunction with the λ-Red recombinase system or suicide plasmids (e.g., pKOV) to achieve precise base substitution or seamless editing.

3.3 Transformation Efficiency Optimization:

For hypermucoviscous clinical isolates, transformation barriers are overcome by optimizing electroporation conditions or using helper plasmids to suppress capsule synthesis.

4.Core Application Areas

(1) Functional Genomics: Precise deletion of target genes (knockout) to study their functions in metabolism or pathogenesis.

(2) Drug Resistance Mechanism Analysis: Introduction of point mutations to mimic natural variants, analyzing the evolutionary patterns of resistance to antibiotics such as carbapenems.

(3) Pathogenicity Studies: Knockout of capsule synthesis genes (cps) or virulence factors to assess their impact on host infectivity.

(4) Attenuated Vaccine Development: Sequential editing of multiple genes to construct safe and effective attenuated vaccine strains.

(5) Synthetic Biology Engineering: Insertion of reporter genes (e.g., fluorescent proteins) for real-time monitoring of strain dynamics within hosts or the environment.

5.Project Workflow and Validation

We provide a one-stop service from design to delivery, ensuring the accuracy of editing outcomes:

(1) Design and Vector Construction: Designing knockout vectors and sgRNAs for the target sites.

(2) Bacterial Transformation and Screening: Employing techniques like electroporation to overcome transformation challenges in positive clones.

(3) DNA Targeting and Repair: The Cas9 system guides double-strand break formation in vivo, followed by homologous recombination repair using donor DNA.

(4) Multi-level Validation: Ensuring positive mutations via PCR identification and Sanger sequencing.

Figure 2. Schematic Diagram of Project Workflow

6.Genome Editing Project Introduction

6.1 Core services include:

(1) Gene Knockout/Inactivation: Precise deletion or disruption of target genes for constructing mutant strains.

(2) Gene Knock-in/Overexpression: Insertion of reporter genes or exogenous genes at specific sites to construct stable expression strains.

(3) Precise Point Mutation: Mimicking natural mutations to study drug resistance mechanisms or the function of key protein sites.

(4) Multi-gene Editing: Achieving sequential or simultaneous editing of multiple targets for constructing complex engineered strains.

6.2 Technical Advantages:

(1) High Success Rate: Optimized protocols for transforming hypermucoviscous and clinical CRKP strains.

(2) Customized Design: Providing optimal strategies based on client research objectives (e.g., studying capsule synthesis, toxin expression).

(3) End-to-End Validation: Offering a complete closed-loop service from vector construction to final sequencing verification.

7.Case Studies

We have successfully provided services for numerous top universities, research institutes, and biotech companies both domestically and internationally. Below is an example:

Case: Gene Knockout in a Clinical Klebsiella pneumoniae Strain

Project Description: Successfully knocked out a key gene in a carbapenem-resistant Klebsiella pneumoniae (CRKP) clinical isolate.

Figure 3. Monoclonal Identification of Target Gene Knockout

Figure 4. Sequencing Results Confirming Successful Target Gene Knockout

8. Reference

[1] NavonVenezia, S., et al. (2017). Klebsiella pneumoniae: A major worldwide source and shuttle for antibiotic resistance. FEMS Microbiology Reviews.

[2] Wang, Y., et al. (2018). Optimized CRISPR/Cas9 system for genome editing of Klebsiella pneumoniae. Applied and Environmental Microbiology.

[3] Jiang, W., et al. (2013). RNA-guided editing of bacterial genomes using CRISPR-Cas systems. Nature Biotechnology.

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By choosing us, you will gain an experienced and technically proficient partner in genome editing. We commit to accelerating your research or projects with professional technologies, rigorous processes and efficient communication.

Consult us now to obtain your customized editing scheme and quotation!