CD Biosynsis offers comprehensive Protein Modification and Labeling Services to chemically or enzymatically functionalize your proteins for various downstream applications, including imaging, diagnostics, therapeutics, and drug delivery. Our expertise ranges from non-specific chemical conjugation to highly precise Site-Specific Protein Labeling using advanced methods like Sortase and Click chemistry. We specialize in introducing fluorescent tags, biotin, and PEG moieties, and conducting complex Protein Glycoengineering . By ensuring precise control over the modification location and stoichiometry, we deliver modified proteins that maintain native function while gaining the required technical capability for your specific research or product needs.
Get a QuoteSuccessful protein experiments often hinge on the quality of the modification and labeling. Non-specific or poorly controlled labeling can lead to functional impairment, aggregation, or batch-to-batch variability. Our services utilize advanced chemistry and enzymatic techniques to ensure the modification occurs at the desired location (site-specific) and in a controlled manner (defined stoichiometry). This precision is vital for applications like ADC (Antibody-Drug Conjugate) development, where the drug-to-antibody ratio (DAR) must be highly consistent, or in single-molecule imaging where precise placement of the fluorophore is required.
Advanced chemical and enzymatic methods (e.g., Sortase, AHA/K incorporation, Click Chemistry) to label at a single defined location.
Conjugation of various fluorophores (FITC, Alexa Fluor, R-Phycoerythrin) for flow cytometry, microscopy, and binding assays.
Efficient and controlled labeling with Biotin (Streptavidin tag) for detection, immobilization, and purification applications (e.g., ELISA, SPR).
Covalent attachment of Polyethylene Glycol (PEG) to increase therapeutic half-life, reduce immunogenicity, and improve stability.
Modification or customization of N- and O-linked glycosylation patterns in mammalian or microbial hosts for optimal function and safety profiles.
Our process ensures optimal functional modification with minimal loss of protein activity.
Protein Preparation & QC
Conjugation Strategy Selection
Reaction Execution & Purification
Final Validation & Characterization
Client supplies purified protein or utilizes our Protein Expression service.
Initial QC: Verification of purity, concentration, and integrity (SDS-PAGE, SEC) to ensure optimal starting material.
Buffer exchange or concentration adjustment to suit the chosen chemical reaction.
Selection between non-specific (amine, thiol) and Site-Specific chemistry (azide-alkyne, Sortase).
Optimization of reagent molar excess, pH, and reaction time to control stoichiometry (DAR for ADCs).
Mass Spectrometry (MS): Verification of successful conjugation and determination of the stoichiometry/DAR.
Purity & Aggregation: SDS-PAGE and SEC to check integrity and homogeneity.
Functional Assay: Validation of the labeled protein's biological activity/binding capacity against the unmodified control.
Advanced Site-Specific Methods
Expertise in Click Chemistry and Enzymatic Tagging ensures labeling at a single, predefined residue, preserving functional integrity.
Therapeutic PEGylation Focus
Optimized protocols for PEG attachment to improve pharmacokinetic properties, crucial for developing stable therapeutic biologics.
Accurate Stoichiometry Control
Precise control over the labeling ratio (e.g., DAR) for ADC and diagnostic applications, verified by Mass Spectrometry.
Glycoengineering Expertise
Ability to engineer complex glycosylation patterns, essential for antibody function, stability, and therapeutic efficacy.
"The Site-Specific Labeling using Sortase chemistry was impeccable. They delivered our diagnostic probe with a 1:1 fluorophore ratio, confirmed by MS, which was critical for our single-molecule imaging study."
Dr. Chen Liu, PI, Biophysics Research Center
"We used the Protein PEGylation service for our therapeutic enzyme. The resulting protein showed significantly extended half-life in vivo and maintained full catalytic activity, a major breakthrough for our preclinical work."
Ms. Anya Sharma, Lead Scientist, Biologics R\&D
"The Glycoengineering team successfully switched the glycosylation pattern of our therapeutic antibody from high-mannose to complex type in CHO cells, resulting in improved Fc effector function."
Dr. Marcus Jones, VP of Antibody Engineering
"We commissioned CD Biosynsis to support an intricate gene editing project with multiple targets. Their talent in producing high-quality work in a short period of time was impressive. Their solutions were custom made to suit our needs, and they went above and beyond to ensure our experiments worked. Their support has been a great asset to our research department and we look forward to further working with them."
Dr. Raj Patel, Principal Investigator, Department of Molecular Biology
"As a pharmaceutical company working to discover new cancer therapies, we require accurate, trustworthy gene editing solutions. CD Biosynsis did more than what we expected when it came to providing strong, accurate CRISPR/Cas9 solutions for our preclinical research. Their technical support team was excellent and responsive, and they quickly replied to our questions. This alliance has been pivotal in helping us move our drug pipeline forward. Thank you, CD Biosynsis, for your amazing service!"
Dr. Clara Rodriguez, Chief Scientist, AstraZeneca Pharmaceuticals, Spain
Why is Site-Specific Labeling superior to conventional methods?
Conventional methods (e.g., amine labeling) target multiple Lysine residues randomly, leading to heterogeneous products with variable activity. Site-Specific Labeling targets a single, engineered residue (e.g., non-natural amino acid, Sortase tag), resulting in a homogeneous product with consistent activity and predictable function.
How do you verify the Drug-to-Antibody Ratio (DAR) for ADCs?
The DAR is rigorously verified using High-Resolution Mass Spectrometry (HRMS) and Hydrophobic Interaction Chromatography (HIC)-HPLC. These methods accurately determine the average number of drug molecules conjugated per antibody molecule, ensuring the homogeneity required for therapeutic applications.
What is the main benefit of Protein PEGylation ?
The primary benefit of PEGylation is the dramatic increase in the protein's circulation half-life in vivo . The large PEG chain shields the protein from proteolytic degradation and reduces renal clearance, while often reducing immunogenicity.
Can you perform Fluorescent Labeling on a protein that is sensitive to organic solvents?
Yes. We offer aqueous-friendly labeling reagents and Enzymatic Labeling methods that minimize the use of harsh organic solvents, ensuring that your delicate protein maintains its native structure and activity after conjugation.
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.
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.
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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.