Small Molecule & Post-Translational Modification (PTM) Antibody Development
High-specificity antibodies for haptens, drugs, toxins, and modified epitopes.
Develop antibodies that distinguish phosphorylation, acetylation, methylation, ubiquitination, citrullination, and small molecule conjugates. Our rabbit single B cell platform delivers high sensitivity and precise site discrimination. Complete timeline: 12-14 weeks.
The Challenge: Detecting Protein Modifications
Small molecule antibodies target low-molecular-weight compounds such as drugs, hormones, and toxins. Their high specificity enables applications in drug screening, therapeutic monitoring, and pharmacokinetic analysis—demonstrating that precise molecular recognition is achievable even for structures minimally different from their endogenous counterparts.
Post-translational modifications (PTMs) regulate protein function and interactions, with site-specific modifications producing distinct biological effects. Detecting PTMs requires antibodies capable of distinguishing single amino acid modifications—a challenge demanding exceptional specificity.
Due to the weak immunogenicity of small PTM groups, they are conjugated to carrier proteins (e.g., KLH, BSA) for immunization. The rabbit immune system generates high-affinity antibodies targeting these modifications. Combined with monoclonal technology, this yields rabbit-derived antibodies with high specificity and batch consistency—powerful tools for PTM research.
Why Rabbit for Small Molecule & PTM Antibodies?
🎯 Small Epitope Recognition
Rabbit immune systems generate antibodies that recognize smaller epitopes than mice, making them ideal for detecting single phosphorylation sites, acetylated lysines, methylated arginines, or small molecule haptens.
🔬 High Sensitivity
Rabbit antibodies typically exhibit higher affinity for modified epitopes, enabling detection of low-abundance PTMs in complex biological samples.
⚛️ Simplified IgG Structure
Rabbit IgG has a single subclass and stable κ1 light chain with an extra disulfide bond, facilitating engineering and consistent performance in assays.
EnkiLife PTM & Small Molecule Antibody Platform
🔬 Polyclonal + Monoclonal
Non-conflicting development paths—obtain rabbit polyclonal antisera and monoclonal candidates from the same project.
✅ High Success Rate
Large numbers of clones screened; rabbit's small epitope recognition ensures high sensitivity and site specificity.
⚙️ Excellent Expression
Recombinant antibodies produced in transient or stable systems (HEK293/CHO) ensure batch consistency.
📊 Comprehensive QC
SDS-PAGE, ELISA validation, and Nanodrop quantification for full traceability.
Service Workflow & Timeline(For monoclonal antibody)
| Phase | Description | Timeline |
|---|---|---|
| 1. Project Design | Consultation on target (small molecule or PTM), design of immunogen and screening antigen strategies | 1 day |
| 2. Antigen Preparation | Custom synthesis: hapten-carrier conjugation (KLH/BSA), modified peptides, or recombinant protein with PTM | 3-4 weeks |
| 3. Immunization & B Cell Screening | Rabbit immunization (4 boosts), antigen-specific B cell sorting, single B cell culture | 3-5 weeks |
| 4. Recombinant Expression & Validation | Antibody gene amplification, cloning, recombinant expression, and ELISA validation (including discrimination between modified/unmodified forms) | 2-4 weeks |
| 5. Final Delivery | Full report, antigen and antibody clones/vectors, recombinant protein antigen, purified recombinant antibody | 1 day |
Total Timeline: Approximately 12-14 weeks from project start.
Strategies for Different PTMs
🔹 Phosphorylation
Immunogen: Phosphopeptides (usually 13-18 aa) with phosphorylated residue. Counter-screen with non-phosphopeptide to ensure site specificity.
🔸 Acetylation/Methylation
Modified peptides (acetyl-lysine, methyl-arginine). Critical counter-screening against unmodified and other modified forms.
🔸 Small Molecules (Haptens)
Conjugation to carrier proteins (KLH/BSA) via suitable functional groups. Screening against free hapten and carrier alone.
🔸 ADC Payloads
Develop anti-idiotype antibodies against toxin/linker portions for PK/ADA assays. Requires blocking/non-blocking formats.
What You Receive
🔬Comprehensive Report
Full experimental methods, sequences, and validation data
🔒Clones & Vectors
Antibody genes in cloning vectors; antigen clones as applicable
📄Recombinant Antibody
Purified, validated rabbit monoclonal antibody (mg quantity)
🎯 Multiple Candidates
Several positive clones for downstream evaluation
Simple Quotation & Ordering
Consultation
TAM contacts you within 24h for strategy and quote.
Approval
Review and approve final order details and price.
Project Start
Project initiated; PM provides updates until delivery.
Start Your Monoclonal Project
To discuss your target and receive a customized proposal, please email order@enkilife.com. Our team is ready to assist you right away.
⬇ Download Antibody Request Form