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Advanced Proximity Labeling Technology

Intracellular Protein Biotinylation

Map the living interactome with precision. Our proximity-dependent biotinylation services capture transient protein interactions in their native cellular context.

10-min TurboID
10-20nm Resolution
LC-MS/MS Analysis

Why Choose Our Services

Multiple labeling systems
Flexible subcellular targeting
High-resolution Orbitrap MS
Comprehensive bioinformatics

TurboID/miniTurboID

10-minute labeling, biotin-based

APEX2 System

Sub-minute labeling, biotin-phenol based

BioID System

18-24 hr labeling, low background

Service Overview

Mapping the Living Interactome

Our intracellular biotinylation services enable precise mapping of protein-protein interactions within the native cellular environment

Temporal Precision

From 10-minute TurboID labeling to sub-minute APEX2 snapshots, capture dynamic protein interactions at the exact moment they occur.

  • TurboID: 10-minute labeling
  • APEX2: sub-minute resolution
  • BioID: 18-24 hr for weak interactors

Spatial Resolution

10-20 nm labeling radius ensures only proteins in immediate proximity to your target are captured, providing high-fidelity interaction maps.

Actual labeling radius varies by enzyme system and experimental conditions.

  • 10-20 nm labeling radius
  • Subcellular targeting options
  • Organelle-specific labeling

Native Context

Labeling occurs in living cells before lysis, preserving weak and transient interactions that don't survive traditional co-immunoprecipitation.

  • Preserves native interactions
  • Catches transient associations
  • No cross-linking artifacts

Ready to Discover Your Protein Interaction Network?

Our experts are ready to help design your proximity labeling experiment.

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Technology Platform

Advanced Proximity Labeling Platforms

Multiple enzymatic systems optimized for different experimental requirements

TurboID System

Engineered biotin ligase with 10-minute labeling kinetics. Ideal for dynamic interaction studies with good spatial resolution.

Standard protocols range from 10 to 60 minutes depending on sample type.

10-min labeling time
Non-toxic biotin substrate
10-20 nm radius

APEX2 System

Engineered ascorbate peroxidase enabling sub-minute labeling. Perfect for capturing very transient interactions.

Sub-minute labeling
Requires H2O2
Strong signal

BioID System

Bacterial biotin ligase with 18-24 hr labeling. Best for weak interactors and low-abundance targets.

18-24 hr labeling
Low background
Catches weak interactors

Service Specifications

Comprehensive parameters for proximity labeling experiments

Parameter Specification
Labeling Systems TurboID, miniTurboID, APEX2, BioID, split-TurboID
Labeling Time 1 min (APEX2) to 24 hr (BioID)
Labeling Radius 10-20 nm depending on system
Subcellular Targeting Nuclear, mitochondrial, ER, Golgi, plasma membrane, custom
Sample Types Mammalian cells, yeast, bacteria, tissue samples
Analysis Platform Orbitrap Fusion Lumos LC-MS/MS with TMT/LFQ quantitation options
Bioinformatics GO analysis, KEGG pathway, PPI network, CRAPome contaminant filtering
Delivery Format Raw data, processed results, interactive reports

Service Workflow

From experimental design to data analysis

1

Experimental Design

Consultation on bait protein, labeling system selection, and control experiments

2

Bait Generation

Fusion protein cloning, stable cell line generation, or virus production

3

Labeling and Harvest

Proximity labeling, cell lysis, streptavidin pull-down, on-bead digestion

4

MS and Analysis

LC-MS/MS analysis, bioinformatics processing, interactive report delivery

Research Applications

Versatile tool for spatial proteomics

Protein Interactions

Map direct and indirect protein-protein interactions in living cells

Organelle Proteome

Profile protein composition of specific subcellular compartments

Signal Transduction

Capture dynamic signaling network changes upon stimulation

Drug Target Discovery

Identify novel protein targets and off-target interactions

What Researchers Say

Trusted by scientists worldwide

Principal Investigator

Leading Research University

The TurboID system provided excellent temporal resolution for our signaling pathway study. Captured dynamic interaction changes we couldn't see with traditional methods.

Postdoctoral Researcher

Major Research Institution

The subcellular targeting options allowed us to specifically profile the mitochondrial proteome. Excellent data quality and comprehensive bioinformatics support.

Scientific Literature

Based on peer-reviewed proximity labeling research

Super-resolution proximity labeling with enhanced direct identification of biotinylation sites

Shin S, Lee SY, Kang MG, et al. Communications Biology. 2024.

Novel method for systematic identification of biotinylation sites from proximity labeling for improved protein localization analysis.

View DOI

Improved elution strategy and new monoclonal anti-biotin antibody for LC-MS/MS characterization

Zhu Y, et al. Biochemistry and Biophysics Reports. 2024.

Development of improved immunoaffinity enrichment methods for biotinylated peptide analysis.

View DOI

Frequently Asked Questions

Common questions about proximity labeling services

Which labeling system should I choose?

Choose TurboID for dynamic studies requiring 10-minute time resolution. Choose APEX2 for sub-minute snapshots of very transient interactions. Choose BioID for weak interactors or when low background is critical.

What controls are recommended?

We recommend expressing the bait fusion without the labeling enzyme as a negative control. We offer multiple control strategies, including spatial-specific negative controls (e.g., untargeted ligase) to minimize false positives. For quantitative studies, we offer bioluminescent or isotopic labeling controls.

Can you target specific organelles?

Yes. We offer subcellular targeting with signal sequences for nucleus, mitochondria, ER, Golgi, peroxisomes, and plasma membrane. Custom targeting sequences can also be incorporated.

What bioinformatics are included?

Standard analysis includes GO enrichment, KEGG pathway analysis, protein interaction network visualization, CRAPome contaminant filtering, and comparative analysis with controls. Premium tier includes custom analysis pipelines.

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