TCO-PEG12-DBCO | CAS 2055022-06-3

TCO-PEG12-DBCO is a bifunctional, PEG-spaced click chemistry reagent that combines a trans-cyclooctene (TCO) handle with a DBCO (dibenzocyclooctyne) cyclooctyne for orthogonal strain-promoted cycloaddition workflows. The extended PEG12 spacer supports conjugation flexibility and can reduce steric constraints during labeling and material functionalization. This reagent is commonly used in chemical biology and molecular imaging tool development where sequential or modular assembly of clickable biomolecules and surfaces is required.

1. Sequential Probe Assembly

TCO-PEG12-DBCO enables modular construction of multi-component chemical probes by providing both a TCO and a DBCO reactive group within a single PEG12 linker. Researchers use this format to build labeling schemes for complex imaging or detection platforms, where one end can be engaged with a complementary partner while the other end remains available for subsequent functionalization. The PEG spacer helps maintain productive encounter between reactive groups and bulky targeting ligands, improving the practicality of downstream conjugation steps in probe development workflows.

2. Surface And Material Functionalization

TCO-PEG12-DBCO is applied to functionalize polymeric and biomaterial surfaces that require robust, catalyst-free click attachment chemistry. The dual-click design supports stepwise grafting of coatings, linkers, or capture elements onto substrates such as hydrogels, biosensor surfaces, and microfabricated materials, allowing researchers to tailor surface density and presentation of reactive handles. PEG-mediated spacing is particularly valuable when immobilizing large biomolecules or when maintaining accessibility of binding or recognition motifs after surface modification.

3. Biomolecule Conjugation Platforms

TCO-PEG12-DBCO is used as a versatile intermediate for preparing conjugation-ready biomolecule constructs in chemical biology laboratories. The reagent’s two complementary cycloaddition functionalities allow it to serve as a linker or assembly component for generating reagent sets that connect proteins, peptides, or nucleic-acid-related probes to imaging tags, enrichment handles, or reporter moieties. In workflows that require controlled multistep labeling, the PEG12 spacer supports efficient conjugation while helping preserve the usability of biomolecular components during iterative preparation.

4. Molecular Imaging Reagent Design

TCO-PEG12-DBCO supports the design of molecular imaging reagents and labeling reagents used in research-grade imaging studies, where flexible attachment of reporters is essential. Its bifunctional architecture allows probe developers to incorporate clickable reporter groups and handle exchange strategies during reagent optimization, enabling consistent assembly of imaging-ready conjugates for microscopy, fluorescence-based assays, or other optical readouts. The PEG12 linker contributes to improved spatial organization of the reactive sites, which is often important for reproducible probe performance across different labeling formats.