TAMRA-Azide-PEG-Biotin | CAS 1797415-74-7

TAMRA-Azide-PEG-Biotin is a multifunctional azide-bearing fluorescent bioconjugation reagent that combines a TAMRA fluorophore, a PEG spacer, and a biotin affinity handle. In labeling workflows, the azide group enables copper-catalyzed click chemistry for attaching the TAMRA signal to azide-reactive partners, while the biotin moiety supports affinity capture and enrichment on streptavidin or avidin surfaces. The PEG linker helps maintain TAMRA accessibility for fluorescence readout and supports consistent conjugation performance in complex protein and biomaterial labeling contexts.

1. Affinity-Based Fluorescent Labeling

TAMRA-Azide-PEG-Biotin is used to generate fluorescently tagged biomolecules that can be both visualized and affinity-enriched. Researchers typically employ it in workflows where a click-compatible biomolecule or surface is prepared first, followed by incorporation of the TAMRA signal through azide click coupling, enabling downstream streptavidin-based capture for purification, pull-down assays, or semi-quantitative imaging of labeled targets. The combination of a bright TAMRA reporter with a biotin handle is especially helpful when fluorescence readout needs to be paired with enrichment steps to reduce background from unreacted components.

2. Streptavidin Pull-Down and Imaging

TAMRA-Azide-PEG-Biotin supports fluorescence microscopy and plate-based fluorescence assays that benefit from streptavidin-mediated isolation of labeled conjugates. In cell biology and chemical biology studies, the reagent is commonly incorporated into biotinylated probes, affinity reagents, or labeled biomaterial constructs, after which streptavidin-coated beads, plates, or membranes are used to isolate the fluorescent fraction. This workflow is frequently used to confirm labeling efficiency, track conjugate localization in imaging experiments, or monitor binding of click-installed constructs to biotin-binding platforms.

3. Click-Functionalized Biomaterials

TAMRA-Azide-PEG-Biotin is applied in biomaterials and surface engineering to introduce a fluorescent tag that can be read out after material functionalization and affinity capture. Materials scientists use the azide handle to incorporate TAMRA into PEGylated or click-reactive polymer networks, hydrogels, or surface coatings, while the biotin functionality enables attachment to streptavidin-modified surfaces or retrieval of fluorescently labeled material fractions. The PEG spacer is particularly useful in these contexts to preserve fluorophore accessibility for microscopy and fluorescence quantification of functionalized biomaterial domains.

4. Fluorescent Probe Construction

TAMRA-Azide-PEG-Biotin is leveraged as a modular component for building fluorescent detection reagents where both a fluorophore and an affinity handle are required. Chemical biology teams use it to assemble TAMRA-labeled affinity probes by click coupling to complementary partners, enabling subsequent streptavidin-based immobilization for assay development, imaging controls, or reagent standardization. The reagent's design supports workflows that require a stable fluorescent reporter for tracking probe incorporation and a biotin moiety for consistent immobilization on affinity matrices.