CD Biosynsis offers precise Base Editing Services for Pseudomonas putida, enabling highly efficient single-base substitutions without creating double-strand breaks (DSBs). Base editing represents the pinnacle of precision genetic engineering, allowing researchers to introduce specific point mutations (e.g., C to T or A to G) to modify protein function, alter promoter strength, or eliminate premature stop codons. By combining catalytically impaired Cas9 (dCas9 or Cas9 nickase) with a deaminase enzyme, our platform facilitates the development of rationally designed P. putida strains with subtly optimized metabolic pathways, improved enzyme kinetics, and enhanced industrial fitness, significantly accelerating directed evolution and pathway tuning efforts.
Get a QuoteBase editing is superior to traditional CRISPR/Cas9-mediated gene editing when single-base changes are required. Unlike standard Cas9, which relies on error-prone homology-directed repair (HDR) after a double-strand break, base editors directly convert one base to another. This non-cleavage mechanism eliminates the risk of random insertions/deletions (indels) and off-target mutagenesis associated with DSBs, resulting in ultra-high editing efficiency and purity in P. putida. This precision is essential for fine-tuning the organism's metabolism, such as optimizing ribosomal binding sites (RBS) or altering the coding sequence of rate-limiting enzymes.
Core Components
Composed of Cas9 nickase (nCas9) or dCas9 fused to a Cytosine Deaminase enzyme.
Editing Reaction
Converts Cytosine (C) into Uracil (U). During DNA repair, U is treated as Thymine (T), resulting in a net C·G to T·A substitution.
Core Components
Composed of Cas9 nickase (nCas9) fused to an engineered Adenine Deaminase enzyme (derived from tRNA deaminase).
Editing Reaction
Converts Adenine (A) into Inosine (I). During replication or repair, I is read as Guanine (G), resulting in a net A·T to G·C substitution.
Editing Window
Editing only occurs within a specific 4-6 base window (e.g., positions 4-8) in the target DNA, minimizing unwanted nearby changes.
Indel Prevention
The non-cleavage mechanism (using nCas9 or dCas9) virtually eliminates the generation of random insertion/deletion byproducts.
Our validated protocol ensures high-precision single-base changes with rigorous validation at every step, minimizing off-target effects and indel formation.
1. Computational Design
2. Vector Construction & Delivery
3. Editing and Selection
4. High-Resolution Validation
Target identification: Selecting the precise single-base (C or A) to be mutated.
sgRNA design: Developing guide RNAs to position the target base within the editor's optimal editing window (4-8 bases from PAM).
Off-target assessment: Bioinformatic filtering to ensure minimal potential off-target binding sites in the P. putida genome.
Vector construction: Cloning the chosen sgRNA into the base editor expression plasmid (CBE or ABE).
Transformation: Introducing the complete base editor system (plasmid) into the target P. putida strain, typically via conjugation or electroporation.
Induction: Expressing the base editor under controlled conditions to initiate the deamination reaction.
Genotype Verification: Performing Sanger sequencing of the edited genomic region to confirm the precise single-base substitution (e.g., C→T).
Indel Detection: Deep sequencing analysis to confirm the absence of random insertion/deletion byproducts.
Deliver the verified, pure edited strain and a final report detailing editing efficiency and validation data.
Ultra-High Efficiency
Base editing is typically much more efficient than traditional HDR-mediated editing in P. putida, especially for single-base changes.
Minimal Byproducts
Zero double-strand breaks lead to negligible indel formation, ensuring clean, high-purity edited strains.
Versatile Mutation Scope
Access to four key single-base conversions (C→T, G→A, A→G, T→C) covers most necessary point mutations for protein and promoter engineering.
What is the difference between CBE and ABE?
CBE (Cytosine Base Editor) converts C·G base pairs to T·A base pairs. ABE (Adenine Base Editor) converts A·T base pairs to G·C base pairs. Together, they allow for four of the twelve possible single-base substitutions.
How do you select the best target base?
We use computational tools to design sgRNAs that position the target base (C or A) precisely within the base editor's editing window, typically 4 to 8 bases away from the PAM site, ensuring maximum conversion efficiency.
Can base editing be used to create gene knockouts?
Yes. Base editing can be used to generate a functional knockout by precisely converting a sense codon into a premature stop codon (nonsense mutation), resulting in a truncated, inactive protein.
Is the final strain marker-free and stable?
Yes. After the desired point mutation is achieved, the temporary base editor and sgRNA plasmids are removed via curing. The resulting strain contains only the permanent genomic point mutation and no foreign DNA.
CRISPR-Cas9 technology represents a transformative advancement in gene editing techniques. The main function of the system is to precisely cut DNA sequences by combining guide RNA (gRNA) with the Cas9 protein. This technology became a mainstream genome editing tool quickly after its 2012 introduction because of its efficient, simple and low-cost nature.
The CRISPR gene editing system with its Cas9 version stands as a vital instrument for current biological research. CRISPR technology enables gene knockout (KO) through permanent gene expression blockage achieved by sequence disruption. Various scientific domains including disease modeling and drug screening employ this technology to study gene functions. CRISPR KO technology demonstrates high efficiency and precision but requires confirmation and verification post-implementation because unsatisfactory editing may produce off-target effects or incomplete gene knockouts which impact experimental result reliability. For precise and efficient Gene Editing Services - CD Biosynsis, Biosynsis offers comprehensive solutions tailored to your research needs.
The CRISPR-Cas9 knockout cell line was developed using CRISPR/Cas9 gene editing to allow scientists to remove genes accurately for research on gene function and disease models and pharmaceutical discovery. Genetic research considers this technology essential due to its high efficiency together with simple operation and broad usability.
If your question is not addressed through these resources, you can fill out the online form below and we will answer your question as soon as possible.
CD Biosynsis is a leading customer-focused biotechnology company dedicated to providing high-quality products, comprehensive service packages, and tailored solutions to support and facilitate the applications of synthetic biology in a wide range of areas.