CD Biosynsis offers comprehensive E. coli Expression Vector Design and Cloning Services, providing customized plasmid constructs optimized for high-yield, soluble protein expression. The choice of expression vector—including promoter strength, induction system, and fusion tags—is crucial for successful recombinant protein production. Our service covers rational design from gene synthesis and codon optimization to selection of the ideal vector backbone and precision cloning. We deliver verified, ready-to-use expression plasmids tailored to your target protein’s requirements, whether it demands high constitutive expression or tight inducible control. We specialize in handling complex targets and multi-gene expression systems.
Get a QuoteA poorly designed expression vector can lead to inclusion body formation, protein degradation, or low yield. We mitigate these risks through systematic optimization. This begins with Codon Optimization of the target gene for E. coli's translational machinery and rational selection of a strong, yet controllable promoter (e.g., T7, T5, or trc). We also customize the fusion tag (His-Tag, GST, MBP, SUMO) and protease cleavage site based on the target protein's solubility and purification strategy. Our cloning techniques guarantee sequence accuracy and stability, ensuring the final construct is ready for immediate expression testing and scale-up.
Codon Optimization
Computational analysis and optimization of the target DNA sequence to match the E. coli tRNA pool and eliminate secondary structures for high translation efficiency.
Fusion Tag Strategy
Rational selection of solubility enhancing (MBP, SUMO) or purification tags (His-Tag, GST) and the appropriate protease cleavage site.
RBS Optimization
Fine-tuning the Ribosomal Binding Site (RBS) sequence to control the translation initiation rate, balancing expression level and solubility.
Inducible Promoter Selection
Cloning into strong inducible systems (e.g., T7/IPTG, arabinose) for controlled, high-level expression, minimizing host toxicity.
Vector Copy Number Control
Selection of high-copy, low-copy, or tightly regulated vectors based on the toxicity and expression needs of the target protein.
Multi-Gene Co-Expression
Design of compatible co-expression vectors with orthogonal replication origins and selection markers for multi-subunit protein production.
Seamless Cloning Methods
Utilizing advanced methods like Gibson Assembly or Golden Gate Assembly for scar-less, high-fidelity insertion of the gene into the chosen vector.
Difficult Gene Cloning
Specialized protocols for successfully cloning genes with high GC content, strong secondary structures, or repetitive sequences.
Final Plasmid Verification
Full sequencing of the cloned insert and critical vector regions to guarantee 100% sequence accuracy before host transformation.
A meticulous process ensuring a perfect, ready-to-use expression construct.
Gene Optimization & Synthesis
Vector Selection & Preparation
Precision Cloning & Transformation
Sequence Verification & Delivery
Design: Codon optimization, tag/linker addition, and synthesis of the target gene sequence.
Prep: Preparation of the DNA fragment, ready for ligation or assembly.
Selection: Choice of promoter, replication origin, and antibiotic resistance marker based on project needs.
Linearization: Preparation of the target vector backbone via restriction digest or PCR amplification.
Assembly: High-fidelity cloning (e.g., Gibson, restriction ligation) of the gene into the vector backbone.
Transformation: Introduction of the completed plasmid into the selected E. coli cloning strain.
100% Sequence Accuracy
Final constructs are fully sequenced and verified to ensure zero errors in the coding region and flanking sequences.
Optimized for Soluble Yield
Rational design includes codon optimization and strategic tag selection (e.g., MBP) to maximize soluble protein expression.
Tight Inducible Control
We provide vectors with ultra-low basal expression to prevent toxicity and ensure high expression only upon induction.
Complex Co-Expression
Expertise in designing and cloning multiple compatible plasmids for the co-expression of multi-subunit protein complexes.
"We struggled to clone a difficult, high-GC gene for over a month. CD Biosynsis successfully designed and cloned it into a T7 vector with a His-tag in just two weeks, guaranteeing the sequence was perfect."
Dr. Emily Roth, PI, Protein Biochemistry Lab
"Their expertise in codon optimization for E. coli was evident. The resulting expression plasmid gave us a 5-fold increase in soluble yield compared to our previous construct."
Mr. Kevin Zhou, R&D Manager, Assay Development
"The multi-plasmid co-expression system they designed for our trimeric protein was flawless. All three subunits were expressed simultaneously and efficiently assembled into the active complex."
Ms. Lisa Nguyen, Research Scientist, Structural Biology
"The tight inducible control on the vector they provided was crucial. Our target protein is highly toxic, and the low basal expression prevented cell death, allowing us to achieve high induction yields."
Dr. Raj Patel, Principal Investigator, Molecular Toxicology
"The detailed QC report and full sequence verification gave us high confidence. The plasmid was ready to use immediately for our large-scale protein production runs."
Dr. Clara Rodriguez, Chief Scientist
Why is Codon Optimization necessary for E. coli expression?
Codon optimization ensures that the foreign gene uses codons that are frequently translated by the E. coli tRNA machinery. This prevents translational stalling and increases both the speed and efficiency of protein synthesis, leading to higher yields and better solubility.
What fusion tags do you offer and how do you choose?
We offer common tags like His-Tag and GST for purification, and solubility-enhancing tags like MBP (Maltose-Binding Protein) and SUMO. The choice depends on the protein’s native solubility, size, and the required final purity. We recommend tags that maximize soluble yield.
Can you clone multiple genes into a single vector?
Yes. We can design and clone multi-cistronic vectors (operons) where multiple genes are expressed under the control of a single promoter, or design compatible multi-plasmid systems for balanced co-expression.
How do you guarantee the sequence of the final plasmid?
After cloning, we perform Sanger sequencing across the entire gene insert, all junction sites (promoter/tag/gene/terminator), and critical vector elements to ensure 100% sequence accuracy before delivery.
How much does Metabolic Engineering services cost?
The cost of Metabolic Engineering services depends on the project scope, complexity of the target compound, the host organism chosen, and the required yield optimization. We provide customized quotes after a detailed discussion of your specific research objectives.
Do your engineered strains meet regulatory standards?
We adhere to high quality control standards in all strain construction and optimization processes. While we do not handle final regulatory approval, our detailed documentation and compliance with best laboratory practices ensure your engineered strains are prepared for necessary regulatory filings (e.g., GRAS, FDA).
What to look for when selecting the best gene editing service?
We provide various gene editing services such as CRISPR-sgRNA library generation, stable transformation cell line generation, gene knockout cell line generation, and gene point mutation cell line generation. Users are free to select the type of service that suits their research.
Does gene editing allow customisability?
Yes, we offer very customised gene editing solutions such as AAV vector capsid directed evolution, mRNA vector gene delivery, library creation, promoter evolution and screening, etc.
What is the process for keeping data private and confidential?
We adhere to the data privacy policy completely, and all customer data and experimental data are kept confidential.
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.
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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.