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Cleavable & Non-Cleavable Linkers for Oligonucleotides

Cleavable and non-cleavable modified oligo for ADC-style oligo conjugates, nucleic acid therapeutics, diagnostics, responsive probes and stable long-term bioconjugation.

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Overview

Choose Controlled Release or Permanent Stability

Bio-Synthesis supports a broad portfolio of cleavable and non-cleavable linkers for DNA and RNA oligonucleotide modification. These chemistries enable either controlled release through redox, pH, enzymatic, photolytic or thermal triggers, or stable permanent conjugation for therapeutics, diagnostics and advanced research workflows.

Cleavable linkers such as disulfides, acid-labile hydrazones, Val-Cit-PAB enzyme linkers, GFLG, photocleavable groups and thermally sensitive linkers are used for site-specific release, intracellular activation and responsive probe design. Non-cleavable linkers such as PEG, alkyl, SMCC/BMPS, triazole click, thioether and amide linkers support durable labeling, permanent spacing and solubility tuning.

These linker-modified oligonucleotides are used when a program requires trigger-responsive payload release, stable payload attachment, linker spacing, conjugation geometry control or analytical verification of linker performance.

Trigger-responsive pathway

Cleavable Linker

Designed to release the payload when the selected trigger is present.

Oligo
Release
Payload
Redox pH Enzyme Light Heat
Durable conjugation pathway

Non-Cleavable Linker

Designed to keep the oligo and payload connected through the workflow.

Oligo
Stable
Payload
Permanent linkage
PEG Alkyl Triazole Thioether Amide

Design principle: choose a cleavable linker when release is the function; choose a non-cleavable linker when durable spacing, stability or permanent attachment is the goal.

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Design & QC

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All Linker Categories

Cleavable & Non-Cleavable Linker Matrix

This matrix reorganizes the live-page linker information into a cleaner engineering table for selecting trigger-sensitive or stable linker chemistries.

Linker Product Categories

Cleavable linkers support controlled release; non-cleavable linkers support stable long-term conjugation.

Product Category Cleaved By / Linkage Type Typical Applications Code
Mal-PEG4-Val-Cit-PAB-PNA Enzyme-Cleavable Cathepsin B ADC-style oligo conjugates [Mal-PEG4-VC-PAB-PNA]
Mc-Val-Cit-PABC-PNP Enzyme-Cleavable Cathepsin B ADC-style oligo conjugates [Mc-VC-PABC-PNP]
Mal-PEG1-Val-Cit-PAB-PNP Enzyme-Cleavable Cathepsin B ADC-style oligo conjugates [Mal-PEG1-VC-PAB-PNP]
Gly-Phe-Leu-Gly (GFLG) Enzyme-Cleavable Lysosomal enzymes ADC-style oligo conjugates [GFLG]
Disulfide Linkers Redox-Cleavable Reducing intracellular environments Intracellular release, therapeutic delivery [Disulfide]
Hydrazone Linkers Acid-Labile Acidic pH / endosomal pH pH-triggered release, endosomal systems [Hydrazone]
Photocleavable Linkers Photo-Cleavable Light-triggered cleavage Capture/release probes, light-controlled assays [PC-Linker]
Azobenzene Derivatives Thermally Cleavable Heat-sensitive scission Thermally triggered release [Azobenzene-der]
Alkyl Chains (C3, C6, C12) Non-Cleavable Stable hydrocarbon spacers Labeling, structure, flexibility [Alkyl-C3/C6/C12]
PEG Linkers (PEG4, PEG12, PEG24) Non-Cleavable Flexible hydrophilic spacers Solubility, steric shielding [PEG4/12/24]
SMCC, BMPS Non-Cleavable Maleimide-NHS crosslinkers Protein or peptide-oligo conjugates [SMCC|BMPS]
Click Chemistry Linkers Non-Cleavable Triazole-forming azide-alkyne linkers Bioorthogonal durable coupling [Click-Azide/Alkyne]
Thioether Bonds Non-Cleavable Thiols + maleimides Long-term stable bioconjugation [Thioether]
Amide Linkers Non-Cleavable Carboxylic acid + amine via EDC/NHS Versatile robust linkage [Amide-EDC/NHS]
Design & QC

Design the Trigger, Placement and Analytical Readout Together

DES

Design Tips

  • Trigger match: Pick the cleavable motif to match the biological micro-environment: redox, endosomal pH, lysosomal enzymes, light access or heat.
  • Terminal first: Start at 5′ or 3′ placement; consider internal placement only after Tm validation and spacing review.
  • Orthogonal plan: Stage NHS/amine, click and maleimide/thiol chemistry to avoid cross-reactions.
  • Geometry: Balance payload reach, solubility, steric hindrance and release kinetics early.
QC

QC & Documentation

  • Identity by ESI-MS or MALDI.
  • Purity by HPLC; optional SEC or CE for complex constructs.
  • Cleavage verification by UV/fluorescence or LC/MS endpoints.
  • CoA with yield, purity %, linker identity and conjugation details.
  • ISO 9001 / ISO 13485 alignment; GLP/GMP-aligned practices as scoped.

Bio-Synthesis can recommend linker plus payload geometry and run cleavage profiling in your buffer system when trigger behavior needs to be verified.

Release behavior should be designed before synthesis, not after conjugation.

For trigger-sensitive linkers, the best design depends on where the conjugate needs to remain stable and where it needs to release. Buffer, pH, reducing environment, enzyme access, steric shielding and analytical readout should be considered together.

  • Use disulfide systems for reducing intracellular environments.
  • Use hydrazone systems for acid-responsive release.
  • Use Val-Cit-PAB or GFLG when enzyme-triggered release is central.
  • Use PEG or alkyl non-cleavable linkers when spacing and durability are more important than release.

Cleavage verification

Trigger-specific assays can confirm release behavior by HPLC, LC/MS, UV or fluorescence endpoints.

Stability profiling

Stable linker designs can be evaluated under storage, assay or biological buffer conditions.

Payload geometry

Spacer length and hydrophilicity can influence solubility, binding, uptake and conjugation efficiency.

Technology & Applications

Technology & Applications

Cleavable and non-cleavable linkers serve different engineering roles. Cleavable systems provide controlled release; non-cleavable systems provide stable attachment, spacing and durability.

Application note: cleavable linkers are strongest when release is part of the mechanism; non-cleavable linkers are strongest when the conjugate must remain intact during capture, targeting, imaging or surface immobilization.

REL

Cleavable Technology

Designed to release payloads under reducing agents, acidic pH, enzymatic cleavage, light exposure or thermal conditions.

STB

Non-Cleavable Technology

PEG chains, alkyl spacers, SMCC/BMPS, triazole click linkers, thioethers and amides provide permanent stable connections.

ENG

Engineering Approach

Match linker chemistry to the application while balancing release kinetics, stability, linker length and steric hindrance.

TX

Therapeutics

ADC-style oligo conjugates, siRNA/ASO delivery and controlled release systems.

DX

Diagnostics & Probes

Light-triggered capture/release, hybridization assays and FRET probe workflows.

SUR

Surface Immobilization

Stable PEG or alkyl linkers for biosensor, microarray and surface chemistry platforms.

Frequently Asked Questions

FAQ

What is the difference between cleavable and non-cleavable linkers?
Cleavable linkers are designed to break under specific triggers such as redox, pH, enzymes, light or heat, enabling controlled payload release. Non-cleavable linkers remain intact and provide permanent spacing or stable conjugation.
Which linker should I choose for ADC-style oligo conjugates?
Enzyme-cleavable linkers such as Val-Cit-PAB or GFLG are commonly used for ADC-like constructs because they support lysosomal payload release. Disulfide linkers can be used for reductive intracellular environments.
Do non-cleavable linkers affect oligo hybridization?
PEG and alkyl spacers are designed to be relatively neutral and usually preserve hybridization while providing steric shielding or spacing. Pilot testing is recommended when the linker is close to a critical binding region.
Can cleavable and non-cleavable linkers be combined?
Yes. Complex designs may combine a non-cleavable PEG spacer for solubility with a cleavable motif for triggered release. Orthogonal conjugation planning is recommended.
What QC is provided with linker-modified oligos?
Linker-modified oligos can be characterized by ESI-MS or MALDI, HPLC purity and optional SEC or CE for complex constructs. Cleavable linkers can be verified using trigger-specific cleavage assays.
Can you scale production for therapeutic applications?
Bio-Synthesis supports discovery through GLP/GMP-aligned production as scoped, with ISO 9001 and ISO 13485 aligned processes, validated QC and documentation support.
More FAQ'sAll FAQ's
Contact & Quote Request

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Share your linker category, oligo sequence, payload or partner molecule, placement, scale, QC requirements and release/stability goals. Bio-Synthesis can help align trigger chemistry, linker geometry, purification and analytical verification.
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