CD Biosynsis offers specialized Biotinylation services for Peptides and Small Molecules, providing high-affinity handles for sensitive detection, drug-target identification, and localized delivery. Unlike large proteins, peptides and small organic molecules are highly sensitive to the addition of tags; even a small biotin molecule can significantly alter their pharmacokinetics, solubility, or target binding affinity. Our platform focuses on the strategic integration of biotin tags to ensure that your molecule’s biological activity remains optimized while gaining the extreme stability of the biotin-streptavidin interaction.
Our expert chemists utilize a broad range of bioorthogonal chemistries and customized linkers to achieve precise labeling. Whether you are developing a biotinylated peptide for GPCR binding assays or a biotin-labeled small molecule probe for Activity-Based Protein Profiling (ABPP), we provide a complete solution from molecular design and chemical synthesis to high-resolution purity verification. We specialize in identifying the ideal attachment site that minimizes steric hindrance and preserves the pharmacophore of your lead candidate.
Get a QuoteBiotinylation of small entities requires a surgical approach. In peptides, random labeling of lysine residues often results in inactive products. We utilize Solid-Phase Peptide Synthesis (SPPS) to incorporate biotinylated amino acids at specific positions during the assembly of the peptide chain. For small molecules, we perform structure-activity relationship (SAR) analysis to identify "solvent-exposed" regions where a biotin tag can be attached without disrupting the ligand-protein binding interface.
Linker engineering is the most critical factor in peptide and small molecule biotinylation. Because these molecules are small, a biotin tag placed too close to the pharmacophore can cause significant steric hindrance, preventing the molecule from reaching its target or preventing streptavidin from binding the biotin. We utilize a diverse library of PEGylated (polyethylene glycol) and alkyl spacers of varying lengths (from 5 to 50 Å) to provide the necessary distance and flexibility, ensuring dual-functionality: high target affinity and high streptavidin capture efficiency.
N-terminal/C-terminal
Utilizing SPPS to attach biotin at either terminus with high regioselectivity using various linker lengths.
Internal Lys(Biotin)
Incorporating biotinylated lysine analogues at specific internal positions that are surface-accessible and non-essential for activity.
Target ID / ABPP
Designing biotin-labeled drugs or inhibitors to identify unknown protein targets in complex lysates via streptavidin pull-down.
Click Chemistry
Utilizing Azide or Alkyne-functionalized small molecules for subsequent biotinylation via Cu-free click reactions.
Disulfide Cleavage
Utilizing redox-sensitive linkers (e.g., SS-linkers) to release the native peptide or molecule after streptavidin capture.
Photo-Cleavable
Incorporating UV-sensitive spacers for the light-controlled release of molecules in specialized biological studies.
Our technical pipeline ensures high-purity conjugates with exhaustive verification of chemical identity and activity.
1. Design & SAR Analysis
2. Chemical Synthesis
3. Purification & Fractionation
4. Analytical Verification
Structural evaluation of the peptide or molecule to identify non-critical regions for biotin attachment. Selection of the optimal PEG or LC spacer length.
Synthesis via SPPS (for peptides) or multi-step organic synthesis (for small molecules). Implementation of bioorthogonal coupling chemistries (NHS, Maleimide, or Click).
Verification of exact molecular weight via ESI-MS or MALDI-TOF. Purity assessment via analytical HPLC. Functional validation through binding or displacement assays.
Site-Specific Accuracy
Surgical placement of the biotin tag via synthetic incorporation, ensuring 100% homogeneity and predictable biological behavior.
Activity Preservation
Advanced linker engineering and structural modeling to minimize steric hindrance and maintain target binding affinity.
Solubility Enhancement
Wide selection of hydrophilic PEG linkers to prevent the aggregation often caused by attaching hydrophobic biotin tags to small molecules.
High-Resolution Analytics
Rigorous verification of every conjugate using LC-MS and HPLC to ensure a well-defined product for high-stakes research.
Technical insights for your peptide and small molecule projects.
Contact Us1. How do you prevent the biotin tag from interfering with peptide activity?
We utilize structural modeling and SAR data to place the biotin tag at a position (usually a terminus) that is not involved in receptor binding, often separated by a flexible PEG spacer.
2. Can I biotinylate a small molecule that has no functional groups?
No, the molecule must have a reactive handle (e.g., —NH2, —COOH, —SH, or an Alkyne/Azide). If it doesn't, we can often synthesize a derivative of the molecule that includes a suitable handle.
3. Why use a PEG linker instead of a simple alkyl chain?
PEG linkers are more hydrophilic, which helps maintain the solubility of the small molecule in aqueous buffers. They also offer superior flexibility to reduce steric hindrance.
4. What purity level is delivered for biotinylated peptides?
We typically deliver peptides at >95% or >98% purity as verified by analytical RP-HPLC and mass spectrometry.
5. Is the biotin tag stable in cell culture media?
The covalent bonds used (amide or thioether) are very stable. However, peptides themselves may be prone to proteolysis. We can incorporate D-amino acids or modified backbones to enhance stability.
6. Can you synthesize peptides with multiple biotin tags?
Yes. By incorporating multiple biotinylated lysine residues during synthesis, we can create multi-valent probes for enhanced signal detection.
7. How do I choose between N-terminal and C-terminal biotinylation?
This choice depends on which end of your peptide is less important for its biological function. For example, if the C-terminus is required for receptor activation, we would label the N-terminus.
8. What is the typical turnaround time for a custom biotinylated peptide?
A custom peptide synthesis and biotinylation project typically takes 2 to 4 weeks depending on the length and complexity of the sequence.
Would you like to discuss the structural requirements of your peptide or lead molecule to determine the best attachment site and linker length for your intended assay?
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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.