CD Biosynsis offers specialized Intracellular Protein Biotinylation services, a critical methodology for mapping protein-protein interactions (PPIs), identifying localized proteomes, and tracking the metabolic state of proteins within the native cellular environment. Unlike surface labeling, intracellular biotinylation requires reagents that can bypass the hydrophobic plasma membrane or the use of genetically encoded enzymes to tag proteins within specific organelles. Our platform provides the chemical and biological tools necessary to "probe" the internal workings of the cell with high temporal and spatial resolution.
Our technical team excels in the application of both membrane-permeable chemical probes and advanced proximity-dependent labeling (PDL) technologies. Whether you are investigating the interactome of a nuclear transcription factor or mapping the mitochondrial matrix proteome, our services ensure high labeling efficiency with minimal disruption to cellular homeostasis. We provide an integrated workflow that spans from custom probe design to high-sensitivity streptavidin capture and LC-MS/MS proteomic identification.
Get a QuoteIntracellular biotinylation serves as a molecular "fishing" tool within the cytoplasm and organelles. Traditional pull-down assays often suffer from high background noise and the loss of transient interactions during cell lysis. Intracellular biotinylation, particularly proximity labeling, covalently tags neighboring proteins in situ before lysis occurs. This "freezes" the biological context, allowing for the capture of weak or transient interactions that would otherwise be lost in standard biochemical preparations.
The core of our intracellular platform includes the use of non-sulfonated NHS-biotin reagents for general labeling, and enzyme-based systems like BioID, TurboID, and APEX2 for targeted proximity labeling. These enzymes generate highly reactive biotin intermediates (biotin-AMP or biotin-phenoxyl radicals) that have a short half-life and a limited diffusion radius (typically 10 to 20 nanometers). This ensures that only proteins in the immediate vicinity of your protein of interest are biotinylated, providing a high-fidelity map of localized protein neighborhoods.
NHS-Biotin
Utilizing non-sulfonated, hydrophobic reagents that freely diffuse across the plasma membrane to label primary amines in the cytoplasm and nucleus.
Photo-Reactive
Using aryl azide-biotin probes that can be activated by UV light to "capture" internal protein states at specific time points.
BioID / TurboID
Fusing a biotin ligase to your protein of interest to tag nearby proteins with biotin-AMP over a period of minutes to hours.
APEX2 System
Utilizing engineered peroxidase to generate reactive radicals in the presence of H2O2, enabling ultra-fast labeling (sub-minute) of localized proteomes.
AHA / Azidohomoalanine
Incorporating azide-modified amino acids during protein synthesis, followed by "clicking" on a biotin-alkyne probe inside the cell.
Pulse-Chase
Tracking the lifespan and degradation of newly synthesized proteins using time-resolved metabolic biotinylation.
Our technical pipeline is designed to ensure maximum labeling depth while maintaining cell health and avoiding non-specific background.
1. System Design
2. In Situ Labeling
3. Capture & Enrichment
4. Proteomic Profiling
Selection of the labeling method (e.g., TurboID vs. Chemical). Construction of fusion vectors or preparation of cell-permeable biotin probes.
Induction of labeling in live cells (e.g., addition of exogenous biotin or H2O2). Precise control of incubation times to minimize over-labeling and diffusion-related noise.
On-bead digestion followed by high-resolution LC-MS/MS analysis. Data filtering against control groups to identify high-confidence localized proteomes or interactors.
Contextual Fidelity
Labeling occurs within the complex cellular environment, capturing interactions as they happen in living cells.
Transient Interaction Capture
Covalent tagging allows for the identification of weak or ephemeral protein-protein interactions that do not survive traditional co-IP.
Organelle Specificity
By targeting PDL enzymes to specific compartments (nucleus, ER, Golgi), we provide high-resolution maps of localized proteomes.
High Sensitivity
The biotin-streptavidin system allows for the enrichment of even low-abundance internal proteins for comprehensive MS detection.
1. What is the difference between BioID and APEX2?
BioID uses a biotin ligase and takes hours to label, making it ideal for steady-state interactions. APEX2 uses a peroxidase and labels in seconds, providing a "snapshot" of rapid cellular changes.
2. Can chemical NHS-biotin reagents label proteins inside the nucleus?
Yes, provided they are non-sulfonated. Standard NHS-biotin is hydrophobic and can cross both the plasma membrane and the nuclear envelope to label internal primary amines.
3. How do you deal with naturally biotinylated proteins (background)?
Cells contain a small number of endogenous biotin-dependent carboxylases. We always include a "no-enzyme" or "no-probe" control in our MS analysis to filter out these background proteins.
4. Is the biotinylation reaction toxic to the cells?
Chemical labeling can be stressful at high concentrations. Enzymatic methods like TurboID are generally well-tolerated, although APEX2 requires the addition of H2O2, which necessitates very short reaction times to maintain cell health.
5. How many cells are needed for an interactome proteomics project?
Typically, we require 2 to 5 million cells per sample to ensure sufficient enrichment of low-abundance biotinylated interactors for high-quality LC-MS/MS results.
6. Can I study protein-RNA interactions using this method?
Yes, APEX2 and other proximity methods can be adapted to tag RNA-binding proteins (RBPs) in the vicinity of specific RNA molecules or organelles.
7. Why is denaturing lysis used for intracellular pull-downs?
Since the biotin tag is covalent, we can use harsh detergents to break all non-covalent background binding. This results in a much cleaner enrichment compared to standard co-immunoprecipitation.
8. What is the typical turnaround time for a TurboID-MS project?
From fusion vector construction and cell labeling to final proteomic data reporting, the timeframe is typically 8 to 12 weeks.
Would you like to discuss the design of a TurboID or APEX2 proximity labeling experiment to map the interactome of your specific protein of interest?
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