DBCO-Maleimide | CAS 1395786-30-7

DBCO-Maleimide is a bifunctional click chemistry reagent that combines a DBCO (dibenzocyclooctyne) cyclooctyne for strain-promoted azide–alkyne cycloaddition (SPAAC) with a maleimide group that reacts rapidly with thiols. This structure enables orthogonal, sequential labeling strategies in chemical biology workflows, where biomolecules or surfaces can be functionalized through thiol capture and later connected to azide-bearing partners without copper catalysis. As a widely used crosslinker and conjugation handle, DBCO-Maleimide supports modular assembly of probes, materials, and imaging reagents that benefit from bioorthogonal compatibility and convenient downstream coupling.

1. Thiol Capture Bioconjugation

DBCO-Maleimide is commonly used to introduce a DBCO handle onto thiol-containing biomolecules such as peptides, proteins, antibodies, and engineered protein domains via maleimide–thiol coupling. Researchers and reagent developers rely on this step to generate azide-reactive conjugates for subsequent SPAAC ligation, enabling streamlined preparation of labeled targets for microscopy, flow-based assays, and biochemical characterization. The resulting DBCO-functionalized constructs are frequently used as intermediate building blocks in modular labeling pipelines, including workflows where multiple functional groups must be installed with minimal interference.

2. Modular Probe Assembly

DBCO-Maleimide is well suited for constructing modular molecular imaging and detection probes by first installing DBCO onto a targeting or recognition component through maleimide chemistry and then performing copper-free SPAAC with azide-functional reporters. This approach is widely adopted in chemical biology because it separates the thiol-labeling step from the final “click” connection, supporting flexible interchange of fluorophores, affinity tags, and polymeric or nanoparticle carriers. In practical reagent development, DBCO-Maleimide helps teams generate consistent DBCO-bearing intermediates that can be rapidly coupled to diverse azide reagents, simplifying probe library generation and iterative optimization.

3. Surface And Material Functionalization

DBCO-Maleimide is frequently applied to functionalize biomaterial surfaces and interfaces where thiol groups are available or can be introduced, including polymer coatings, hydrogel networks, and engineered material scaffolds. By anchoring the maleimide to thiolated surfaces, DBCO moieties are displayed for later SPAAC attachment of azide-bearing molecules, allowing spatially controlled patterning and modular assembly of functional coatings. This strategy is used in research settings to create biofunctional materials for tool development, including immobilized affinity reagents, responsive surface architectures, and multicomponent material constructs assembled through click-compatible chemistry.

4. Multivalent Crosslinking Strategies

DBCO-Maleimide supports multivalent crosslinking and assembly designs where thiol-reactive capture is used to build DBCO-presenting scaffolds that can subsequently engage azide ligands. Teams developing complex conjugates for biochemical tools often use DBCO-Maleimide to create higher-order architectures, such as DBCO-decorated carriers that can be linked to multiple azide partners in a controlled manner. This enables the generation of multivalent constructs with improved structural organization for assay development and materials research, while maintaining the convenience of copper-free SPAAC for the final coupling step.