DBCO-PEG2-PFP ester | CAS 2304558-23-2

DBCO-PEG2-PFP ester is a bifunctional click chemistry reagent that combines a dibenzocyclooctyne (DBCO) handle for strain-promoted azide–alkyne cycloaddition with a PEG2 spacer terminating in a pentafluorophenyl (PFP) ester for efficient acyl transfer to primary amines. This design supports modular bioconjugation workflows where biomolecules, polymers, or surfaces are first functionalized through the PFP-activated ester and then coupled to azide-bearing partners via DBCO–azide click chemistry. The PEG2 spacer improves aqueous compatibility and can reduce steric constraints, making DBCO-PEG2-PFP ester widely used for preparing clickable probes, labeling reagents, and functional materials for chemical biology and materials research.

1. Protein And Peptide Labeling

DBCO-PEG2-PFP ester is commonly used to install a DBCO click handle onto proteins and peptides through PFP-ester acylation of accessible primary amines on lysine residues and N-termini. Researchers use the resulting DBCO-functional biomolecules as versatile intermediates for subsequent coupling to azide-tagged biomaterials, imaging handles, or affinity reagents, enabling controlled, modular assembly of multicomponent constructs. The PEG2 linkage helps maintain reactivity and accessibility of the DBCO moiety during downstream click conjugation, which is particularly valuable when labeling complex or sterically demanding targets.

2. Antibody And Affinity Reagent Conjugation

DBCO-PEG2-PFP ester supports preparation of clickable antibody conjugates and affinity reagents by enabling amine-directed attachment of the DBCO-bearing PEG2 group using the PFP ester chemistry. This approach is used in research settings to generate azide-reactive or DBCO-reactive labeling reagents that can be paired with azide-functional secondary components such as polymers, nanoparticles, or targeting modules. By introducing the click functionality at defined biomolecule sites, DBCO-PEG2-PFP ester facilitates streamlined workflows for building conjugates used in molecular imaging reagent development, biochemical assay reagent construction, and platform studies requiring modular attachment of multiple functional groups.

3. Surface and Material Functionalization

DBCO-PEG2-PFP ester is frequently applied to functionalize polymer surfaces, bead supports, and material scaffolds that present accessible primary amines, including amine-derivatized coatings and porous substrates. After PFP-ester coupling anchors the DBCO-bearing PEG2 moiety to the material, the resulting surfaces can be further addressed using azide-containing linkers, capture ligands, or reporter components via strain-promoted click chemistry. This material-first strategy is widely used in biomaterials science to create clickable interfaces for immobilizing biomolecules, building patterned reagent surfaces, and generating reusable platforms for analytical and research workflows.

4. Multicomponent Probe Assembly

DBCO-PEG2-PFP ester is well suited for constructing multicomponent chemical biology probes where a biomolecular targeting element is first functionalized with a DBCO handle and then assembled with azide-bearing reporter or enrichment components. Teams developing fluorescent or affinity-tagged research tools often rely on this reagent to standardize the introduction of a clickable moiety onto proteins, peptides, or amine-functional polymers, reducing variability between probe batches. The PEG2 spacer and the orthogonal nature of PFP-ester coupling followed by DBCO–azide click assembly support flexible design of probe architectures used for mechanistic studies, reagent optimization, and platform prototyping in molecular imaging and diagnostic reagent development.