CD Biosynsis offers specialized Surface Biotinylation services designed to selectively tag and study the "surfaceome"—the collection of proteins and carbohydrates expressed on the outer leaflets of plasma membranes. Surface biotinylation is a powerful technique for investigating cell signaling, receptor internalisation, and membrane protein dynamics. By utilizing membrane-impermeable biotinylation reagents, our platform allows for the exclusive labeling of extracellular domains, providing a clear snapshot of the cell interface without interference from the complex intracellular proteome.
Our technical team provides comprehensive solutions for both live-cell labeling and specialized material surface functionalization. Whether you are mapping the surface proteins of a novel cancer cell line or developing biotin-functionalized nanoparticles for targeted delivery, our platform ensures high labeling efficiency and minimal cell toxicity. We combine advanced chemical labeling with high-sensitivity streptavidin-based capture to deliver high-purity surface fractions ready for proteomics, flow cytometry, or imaging analysis.
Get a QuoteThe success of surface biotinylation depends entirely on the membrane impermeability of the reagent. Standard biotinylation reagents can diffuse across the lipid bilayer, labeling both surface and internal proteins. Our platform utilizes sulfonated (Sulfo) derivatives, such as Sulfo-NHS-Biotin and Sulfo-NHS-SS-Biotin. The negatively charged sulfonate group on the NHS ring prevents the reagent from crossing the hydrophobic plasma membrane, ensuring that only proteins with extracellularly exposed primary amines are modified.
This technique is indispensable for studying protein trafficking and endocytosis. By performing surface biotinylation at 4 degrees Celsius, we "freeze" membrane dynamics, allowing for the quantification of steady-state surface expression. Alternatively, by shifting cells back to 37 degrees Celsius after labeling, we can track the rate at which biotinylated receptors are internalized or recycled. Our high-resolution capture systems utilize streptavidin-coated magnetic beads to pull down the biotinylated surface fraction with zero intracellular background, providing high-fidelity data for downstream LC-MS/MS analysis.
Sulfo-NHS Chemistries
Utilizing water-soluble, membrane-impermeable reagents to target primary amines on the extracellular loops of receptors and ion channels.
Cleavable Options
Using disulfide-linked reagents (Sulfo-NHS-SS-Biotin) to allow for the mild release of captured surface proteins for proteomics.
Periodate Oxidation
Mild oxidation of surface carbohydrates into aldehydes, followed by reaction with Biotin-Hydrazide to map the cell glycocalyx.
Enzymatic Tagging
Utilizing glycosyltransferases to attach biotinylated sugars specifically to surface-exposed glycan chains.
Nanoparticle Coating
Functionalizing the surface of beads, plates, or nanoparticles with biotin for oriented capture of streptavidin-linked ligands.
Silane/Thiol Monolayers
Applying biotinylated silanes or thiols to create stable self-assembled monolayers (SAMs) on glass or gold surfaces.
Our systematic technical pipeline ensures high labeling density while rigorously maintaining cell viability and membrane integrity.
1. Cell Preparation
2. Selective Labeling
3. Lysis & Capture
4. Analysis & Proteomics
Washing cells with ice-cold, amine-free PBS to remove serum proteins and metabolic byproducts. Cooling cells to 4 degrees Celsius to inhibit endocytosis.
Incubation with Sulfo-NHS-Biotin reagents. Quenching the reaction with glycine or Tris buffer to prevent off-target labeling after cell lysis.
Elution of surface proteins (via heat or reduction). Verification of surface specificity using Western blot markers (e.g., Na/K-ATPase for surface, GAPDH for internal). Final proteomics or imaging analysis.
Zero Internal Background
Rigorous use of sulfonated reagents ensures that 100 percent of the biotinylated fraction originates from the extracellular space.
High Cell Viability
Optimized reaction conditions preserve membrane integrity and cell health, ensuring that "leakage" does not contaminate the surface fraction.
Cleavable Technology
Mastery of disulfide-linked reagents allows for the gentle recovery of native proteins from streptavidin beads for functional studies.
Integrated Analytics
Seamlessly integrated with our proteomics and imaging platforms to provide a complete "surfaceome" data package.
1. How do you prove that the biotinylation reagent didn't enter the cells?
We perform Western blot validation on the final pulled-down fraction. We check for the presence of surface markers (like E-cadherin) and the absence of abundant cytosolic markers (like GAPDH or Actin).
2. Why must surface biotinylation be performed at 4 degrees Celsius?
At 37 degrees, cells constantly internalize membrane proteins via endocytosis. Cooling to 4 degrees halts these vesicular trafficking processes, ensuring we label the steady-state surface population.
3. Can surface biotinylation be used on suspension cells?
Yes. Both adherent and suspension cells are compatible. Suspension cells require gentle centrifugation steps between washes to prevent cell lysis and reagent leakage.
4. What is the advantage of using Sulfo-NHS-SS-Biotin?
This reagent contains a disulfide bond in the spacer arm. This allows the surface proteins to be eluted from streptavidin beads under mild reducing conditions (DTT/TCEP), which is better for many downstream proteomic techniques.
5. How many cells are required for a surface proteomics project?
Typically, we require 10 to 50 million cells per sample to ensure enough surface protein is captured for high-quality LC-MS/MS analysis.
6. Can this method label surface carbohydrates?
Standard Sulfo-NHS reagents label proteins. For surface glycans, we use a periodate-hydrazide strategy which converts sugars into biotinylated targets.
7. Is it possible to study receptor internalization using this technique?
Yes. This is called an "internalization assay." We label the surface at 4 degrees, shift cells to 37 degrees for varying times, and then use a "stripping" buffer to remove biotin from the remaining surface proteins. Only internalized proteins remain biotinylated.
8. What is the typical turnaround time for a surface proteomics project?
From cell labeling and capture to final LC-MS/MS data reporting, the timeframe is typically 4 to 6 weeks.
Would you like to discuss the design of a receptor internalization assay or a comprehensive surface proteomics screen for your target cell line?
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.