Aptamer Conjugation Solutions

Creative Biolabs offers a comprehensive suite of aptamer conjugation solutions. By chemically linking aptamers with various functional moieties (therapeutic oligonucleotides, antibodies, drugs, nanoparticles, and biosensors), we provide our global clients with "next-generation" tools for complement-related disease research and drug development.

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Why Aptamer Conjugation Matters

Aptamers, often referred to as "chemical antibodies," are short, single-stranded DNA or RNA oligonucleotides that fold into unique three-dimensional structures, enabling them to bind to specific targets (such as proteins, small molecules, or cell surfaces) with high affinity and specificity. Binding alone is not enough. In real systems, aptamers must navigate nuclease exposure, circulation time, tissue penetration, intracellular routing, and signal transduction. Conjugation enables:

Functional translation: converting target recognition into payload delivery or signal generation.
PK/PD control: tuning half-life, biodistribution, and clearance.
Multimodality: integrating aptamers with biologics, small molecules, lipids, and materials.
Manufacturability: reproducible synthesis, defined stoichiometry, and analytical traceability.

Great Minds Choose Creative Biolabs

Creative Biolabs integrates linker chemistry, structural modeling, and bioassays to ensure conjugates perform as designed

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Our Integrated Conjugation Platform

Creative Biolabs has integrated multi-disciplinary expertise in nucleic acid chemistry, protein engineering, and pharmacology to offer the following specialized conjugation services.

Aptamer-Therapeutic Oligonucleotide Conjugates

The conjugation of aptamers and therapeutic oligonucleotides can be easily achieved by covalent ligation or complementation to produce aptamer-oligonucleotide conjugates. The significant advantages of this conjugate compared to other methods are simplicity, ease of manufacture, and low immunogenicity.

Aptamer-Antibody Conjugates

Antibody-aptamer conjugate can increase the binding affinity and inhibitory effect of antibody or aptamer to its target. We offer antibody-aptamer conjugate development services, which can be applied to almost all desired antibodies and aptamers by using the linker residues of antibody constant region and simple conjugation protocol.

Aptamer-Drug Conjugates

Aptamer-drug conjugate development is our specialized platform for creating highly selective, chemically stable therapeutic assets. This service leverages the unique tertiary structure of aptamers as a molecular GPS to guide potent payloads directly to diseased tissue.

Aptamer-Cholesterol Conjugates

We proudly offer global customers the most tailored aptamer-cholesterol conjugate development services with the advantages of fully customized, high reproducibility, and abundant experience. We have completed multiple aptamer development projects, accumulating rich experience.

Aptamer-Nanoparticles (NPs) Conjugates

To achieve higher specificity and tumor-target effect, conjugating nanoparticles to targeting agents have been tried. Aptamers, small oligonucleotides with unique 3-dimensional structures and high affinity to targets, have emerged as novel targeting agents that conjugate to nanoparticles for their target drug delivery.

Bivalent/Multivalent Aptamer Development

We offer one-stop custom bivalent aptamer development services, as well as aptamer conjugates development, such as aptamer-oligonucleotide conjugates, aptamer-antibody conjugates, aptamer-drug conjugates, aptamer-cholesterol conjugates, aptamer-nanoparticles conjugates, and aptamer-based biosensors.

Aptamer-based Biosensor Development

Creative Biolabs provides a variety of solutions for the development of aptamer-based biosensors. The high-sensitivity and high-specificity aptamers against any given target can be selected. Combined with advanced sensing technologies, the selected aptamers can be designed as excellent biosensors for medical and environmental research.

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Why Choose Creative Biolabs?

Chemistry decisions guided by real use cases

One platform, multiple conjugation modalities

Every construct characterized, not assumed

Outputs ready for downstream studies

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Technology Comparison

To help our clients make informed decisions, we provide a detailed comparison between Aptamer-based conjugates and traditional Antibody-based conjugates (ADCs/Ab-Oligo).

Feature	Aptamer-Drug/Oligo Conjugates (ApDCs/AsOCs)	Antibody-Drug/Oligo Conjugates (ADCs/AbOCs)
Size	Small (8-15 kDa), better tissue penetration	Large (~150 kDa), limited penetration
Immunogenicity	Generally non-immunogenic	Potential for HAMA (Human Anti-Mouse Antibodies)
Production	Chemical synthesis (Batch-to-batch consistency)	Cell culture (Complex, risk of contamination)
Thermal Stability	High (Regenerable after denaturation)	Low (Sensitive to heat and pH)
Targeting Affinity	Equivalent to antibodies (pM to nM range)	High (pM to nM range)
Modification	Site-specific modification is easy and precise	Site-specific conjugation is complex
Cost	Relatively low in the long term	High (R&D and manufacturing)

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Technical Details

At Creative Biolabs, we focus on the "Linker" and "Conjugation Chemistry," which are the heart of any conjugation solution.

Advanced Linker Technology

The linker determines the stability and release profile of the therapeutic cargo. We offer:

pH-Sensitive Linkers
Enzymatic Cleavable Linkers
Non-Cleavable Linkers

Precision Conjugation Chemistries

We utilize bio-orthogonal reactions to ensure the aptamer's tertiary structure is preserved:

Click Chemistry (DBCO/Azide)
Thiol-Maleimide Reaction
Amine-NHS Ester

Site-Specific Modification

Unlike random conjugation, which can mask the binding site, our site-specific approach ensures that the "Complement Binding Domain" of the aptamer remains fully functional, maintaining high target affinity.

Case Studies

Case 1

Aptamer-Modified Au Nanoparticles

The conjugation of a dopamine-binding aptamer (DBA) to the pA-AuNPs yields aptananozyme structures catalyzing simultaneously the H₂O₂-mediated oxidation of dopamine to aminochrome through the aerobic oxidation of glucose. A set of aptananozymes consisting of DBA conjugated through the 5′- or 3′-end directly or spacer bridges to pA-AuNPs were synthesized. The set of aptananozymes revealed enhanced catalytic activities toward the H₂O₂-catalyzed oxidation of dopamine to dopachrome, as compared to the separated pA-AuNPs and DBA constituents, and structure–function relationships within the series of aptananozymes were demonstrated.

Aptamer-modified Au nanoparticles for functional nanozyme bioreactors (OA Literature) Fig.1 Schematic synthesis of DBA-functionalized pA-AuNPs acting as aptananozymes.^1,2

References

Ouyang, Yu, et al. "Aptamer-modified Au nanoparticles: Functional nanozyme bioreactors for cascaded catalysis and catalysts for chemodynamic treatment of cancer cells." ACS nano 16.11 (2022): 18232-18243. https://doi.org/10.1021/acsnano.2c05710
Distributed under Open Access license CC BY 4.0, without modification.

What Our Clients Say

"We were developing an aptamer-drug conjugate and had concerns about linker stability and loss of binding affinity. The team provided multiple linker options, explained the trade-offs clearly, and supported the final selection with real data. The resulting conjugate performed consistently across our in vitro assays."

— Director of Early Discovery, European Biopharma

"We were struggling with the rapid clearance of our lead aptamer candidate. Creative Biolabs' Aptamer-Cholesterol Conjugation service not only extended the half-life significantly but also maintained the binding affinity to Factor D. Their analytical characterization was top-tier and gave us full confidence in the final construct."

—Principal Scientist, Ocular Therapeutics Start-up

"By optimizing the linker length between our two C5a-binding aptamers, they helped us achieve a 50-fold increase in neutralization potency. The technical depth of their team is unparalleled in the aptamer field."

— Professor of Immunology, Tier-1 Research University

"Integrating aptamers onto gold nanoparticles for complement biomarker detection was a complex task. Creative Biolabs handled the Aptamer-Nanoparticle Conjugation with precision, delivering a biosensor with femtomolar sensitivity."

— Chief Technology Officer, IVD Company

FAQs

What types of aptamer conjugates can you develop?

We support a broad range of aptamer conjugation formats, including aptamer-therapeutic oligonucleotide conjugates, aptamer-antibody conjugates, aptamer-drug conjugates, lipid- or cholesterol-modified aptamers, nanoparticle-linked aptamers, bivalent or multivalent constructs, and aptamer-based biosensors. Each format is designed based on the intended biological or analytical application rather than a fixed template.

How do you choose the most suitable conjugation chemistry?

Conjugation chemistry is selected based on aptamer structure, payload sensitivity, required stability, and downstream application. We evaluate covalent and non-covalent strategies, cleavable versus non-cleavable linkers, and attachment sites to minimize interference with aptamer folding and functional domains.

Can you help optimize linker length and composition?

Yes. Linker optimization is a core part of our service. We assess linker length, flexibility, and chemical properties to balance steric accessibility, stability, and controlled release. Comparative designs are often evaluated experimentally to identify the optimal configuration.

Do you support cleavable or stimuli-responsive conjugates?

Absolutely. We offer cleavable linkers responsive to pH changes, redox environments, or enzymatic activity. These are particularly useful for controlled drug release or intracellular activation strategies.

What level of characterization is provided with the final conjugates?

Each project includes comprehensive analytical characterization, such as conjugation efficiency, purity, molecular integrity, and stability profiling. Functional validation is performed according to the intended application, whether for delivery, targeting, or signal generation.

How customizable are the deliverables?

Deliverables are tailored to project goals and may include multiple conjugate variants, comparative performance data, analytical reports, and design rationale. This flexibility allows clients to make informed decisions for downstream development.

How do you support projects involving multiple conjugation strategies?

For complex projects, we can design parallel conjugation pathways and evaluate them side by side. This comparative approach helps identify the most robust and scalable solution while reducing development risk.