Advanced Proximity dependent Biotin Identification (BioID) Service

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Creative Biolabs, with over two decades of industry-leading expertise in biotechnology and protein science, is proud to offer a state-of-the-art Proximity-dependent Biotin Identification (BioID) Service. This powerful technology transcends the limitations of conventional methods by enabling the unbiased discovery of protein-protein interactions (PPIs) directly within their natural cellular environment. By fusing a promiscuous biotin ligase to your protein of interest, we can capture a high-resolution snapshot of its proximal proteome, revealing not only direct binding partners but the entire molecular neighborhood.

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What is Proximity-dependent Biotin Identification (BioID)?

Proximity-dependent Biotin Identification (BioID) is a revolutionary technique for identifying physiologically relevant protein associations in living cells. The method's ingenuity lies in its core component: a mutant E. coli biotin ligase, BirA* (R118G), which has lost its substrate specificity.

The Mechanism:

Fusion: The gene for your "bait" protein of interest is fused with the gene for the BirA* enzyme.
Expression: This fusion construct is expressed in the chosen cell line or model organism.
Biotinylation: Upon the addition of excess exogenous biotin to the cell culture, the BirA* enzyme is activated. It generates highly reactive, short-lived biotinoyl-5'-AMP.
Proximity Labeling: This reactive molecule diffuses from the enzyme's active site and covalently attaches to the primary amine groups (mainly on lysine residues) of any protein within a small labeling radius (approximately 10-15 nm).
Capture & Identification: The biotin-tagged "prey" proteins are then stringently captured using streptavidin affinity purification and subsequently identified with high-resolution liquid chromatography-tandem mass spectrometry (LC-MS/MS).

This "history-of-interaction" approach permanently marks proteins that have been in close proximity to the bait, making it exceptionally powerful for discovering previously inaccessible interactomes.

Fig. 1 Overview of proximity biotinylation by BirA*.¹

The Evolution of Proximity Labeling: From BioID to TurboID and miniTurbo

At Creative Biolabs, we are committed to providing our clients with the most advanced technologies. While classic BioID is robust, its long labeling time (18-24 hours) can sometimes be a limitation. To address this, we have fully integrated the next generation of biotin ligases into our service portfolio.

Feature	*Classic BioID (BirA)**	BioID2	TurboID / miniTurbo
Origin	Mutant E. coli ligase	Aquifex aeolicus ligase	Yeast display-evolved ligase
Size	~35 kDa	~27 kDa (Smaller)	~35 kDa / ~28 kDa
Labeling Time	18 - 24 hours	~8 hours	10 - 20 minutes
Efficiency	Low	Moderate	High / Very High
Optimal Temp.	37°C	37°C	Works at room temp & 37°C
Biotin Conc.	High (e.g., 50 µM)	Lower	Lower
Best For	Stable, long-term interactomes	General use, smaller tag size	Dynamic processes, toxic baits, in vivo models

Creative Biolabs' BioID Service: A Workflow Designed for Success

We have optimized every step of the BioID workflow to ensure robust, reproducible, and high-quality data. Our comprehensive service manages the entire process from start to finish.

Phase 1: Project Consultation & Design

Free Consultation: Our Ph.D.-level scientists work with you to understand your research goals, select the best biotin ligase (BioID, BioID2, TurboID), and design the optimal experimental strategy.
Construct Design: We design the fusion construct, considering N- vs. C-terminal tagging and appropriate linkers to ensure the fusion protein is functional and correctly localized.

Phase 2: Molecular & Cellular Biology

Gene Synthesis & Cloning: We synthesize and clone your bait gene into our validated BioID expression vectors (Lentivirus, Adenovirus, or standard plasmids).
Cell Line Development: We can generate transiently transfected cells or create stable cell lines expressing the fusion protein for consistent, long-term studies.
Expression & Localization Validation: We confirm the expression and proper subcellular localization of your bait-fusion protein using Western Blot and Immunofluorescence.

Phase 3: Proximity Labeling & Sample Preparation

Optimized Labeling: We perform the biotin labeling under optimized conditions (time, biotin concentration) tailored to the specific ligase and cell type.
Stringent Affinity Purification: Cells are lysed, and biotinylated proteins are enriched using high-affinity streptavidin beads under denaturing conditions to eliminate non-specific background binding.

Phase 4: Mass Spectrometry & Data Analysis

On-Bead Digestion & LC-MS/MS: Captured proteins are digested into peptides and analyzed on our state-of-the-art mass spectrometers (e.g., Orbitrap series).
Advanced Bioinformatics: Raw data is processed using powerful search algorithms. We perform quantitative analysis (e.g., SAINT, CRAPome) to score potential interactors and filter out common contaminants.

Phase 5: Reporting & Follow-up

Comprehensive Data Report: You receive a detailed report including the list of identified proteins, their abundance scores, statistical analysis, and bioinformatics annotation (GO, KEGG pathways).
Ongoing Support: Our team is available to discuss your results and suggest next steps, such as validation via Co-IP or functional assays.

Applications: What Can You Discover with Our BioID Service?

Our BioID platform is incredibly versatile, empowering researchers across numerous fields to answer complex biological questions.

Mapping Comprehensive Protein-Protein Interaction Networks:

Identify stable complex members.
Discover weak and transient interactors often missed by Co-IP.
Validate findings from other interaction screening methods.

Defining Organelle Proteomes:

Characterize the protein composition of specific subcellular compartments (e.g., mitochondria, nucleus, ER, plasma membrane) with high confidence.

Investigating Post-Translational Modifications (PTMs):

Identify enzymes (kinases, phosphatases, ubiquitin ligases) that act on a specific substrate.

Elucidating Drug Mechanism of Action:

Identify the direct and indirect cellular targets of a small molecule drug.

Mapping Virus-Host Interactions:

Uncover the host proteins that viral components interact with during infection.

Studying Insoluble or Membrane-Bound Proteins:

Successfully identify interaction partners for proteins within the nuclear lamina, cytoskeleton, or cellular membranes, which are challenging for traditional biochemical assays.

Frequently Asked Questions (FAQ)

Q: Which is better for my project: BioID or TurboID?

A: It depends on your goal. For stable, long-term interactomes in standard cell lines, classic BioID is a cost-effective and proven choice. For dynamic or transient interactions, for use in whole organisms, or if your bait protein is toxic, TurboID is strongly recommended due to its speed and efficiency. Our experts can help you decide.

Q: What kind of controls are necessary for a BioID experiment?

A: Proper controls are critical. We typically recommend using cells expressing the unfused biotin ligase (e.g., EGFP-TurboID) as a negative control to identify background biotinylation. Comparing results against the CRAPome database of common contaminants is also a standard part of our analysis pipeline.

Q: What material do I need to provide?

A: You can provide as little as the gene name or sequence for your protein of interest. We can handle everything from gene synthesis to the final data report. Alternatively, you can provide a plasmid containing your gene or the stable cell line.

Q: How do you distinguish true interactors from background proteins?

A: We use a multi-faceted strategy. This includes quantitative mass spectrometry to measure the enrichment of proteins in your bait sample compared to controls, statistical scoring (e.g., SAINT analysis), and filtering against databases of known non-specific binders.

Let's Work Together to Fulfil Your PPI Identification!

Based on the powerful technology platform, we are professional in providing one-stop and tailored solutions to advance PPI detection for our valued customers.

Get Started on Your Discovery Journey

With Creative Biolabs' expertise and cutting-edge technology, you can identify novel interactors, uncover new biological functions, and accelerate your path to publication and discovery. Contact us today for a free consultation and to request a quote for your BioID project. Our dedicated team is ready to help you design an experiment that delivers clear, impactful results.

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Reference

Geoghegan, Vincent, Jeremy C. Mottram, and Nathaniel G. Jones. "Tag thy neighbour: nanometre-scale insights into kinetoplastid parasites with proximity dependent biotinylation." Frontiers in cellular and infection microbiology 12 (2022): 894213. Under Open Access license CC BY 4.0, without modification. https://doi.org/10.3389/fcimb.2022.894213

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All listed services and products are For Research Use Only. Do Not use in any diagnostic or therapeutic applications.