5-Propargylamino-dCTP-ATTO-647N

5-Propargylamino-dCTP-ATTO-647N is a clickable, fluorescently labeled deoxycytidine triphosphate analog designed for incorporation into nucleic acids and subsequent bioorthogonal conjugation. The ATTO 647N fluorophore provides far-red emission that is commonly leveraged for multiplex-friendly fluorescence readouts, while the propargylamino handle enables efficient downstream coupling to azide-bearing biomolecules, linkers, or solid supports. In nucleic acid workflows, this reagent supports fluorescence-tagged oligonucleotide construction and enables post-synthetic functionalization for imaging, pull-downs, and assay reagent development.

1. Fluorescent Oligonucleotide Labeling

5-Propargylamino-dCTP-ATTO-647N is used by molecular biology and chemical biology groups to generate fluorescently labeled DNA or RNA probes through enzymatic incorporation during nucleic acid synthesis. Common workflows include primer extension, nick translation, and random priming strategies where the ATTO 647N signal is introduced at cytidine positions to produce robust far-red fluorescent nucleic acid reagents. Researchers select this reagent when they want a bright, spectrally separated dye for microscopy or fluorescence-based nucleic acid assays, while retaining a clickable functional handle for later conjugation steps.

2. Clickable Probe Conjugation

5-Propargylamino-dCTP-ATTO-647N supports two-stage probe engineering: first, fluorescent nucleic acid synthesis with ATTO 647N, then modular attachment of the resulting labeled oligonucleotides to azide-functional partners. This is particularly useful for constructing imaging probes, affinity capture reagents, or immobilized hybridization tools where the oligonucleotide needs to be tethered to surfaces, nanoparticles, or biomolecule scaffolds. Chemical biology labs use the propargylamino functionality to build conjugates that maintain the far-red fluorescence for tracking and workflow monitoring, enabling flexible assembly of custom nucleic acid reagents without redesigning the labeling chemistry each time.

3. Fluorescence In Situ Hybridization

5-Propargylamino-dCTP-ATTO-647N is employed to create far-red fluorescent hybridization probes for spatial nucleic acid detection in fixed samples. In microscopy-driven workflows, ATTO 647N-labeled oligonucleotides provide strong signal for visualizing nucleic acid localization with reduced spectral overlap versus many visible dyes. Researchers use the clickable functionality when they need to further functionalize probes for multimodal labeling strategies or to standardize probe attachment to imaging-compatible carriers, improving reproducibility across probe batches.

4. Flow Cytometry Nucleic Acid Assays

5-Propargylamino-dCTP-ATTO-647N is used to prepare fluorescent nucleic acid reagents for flow cytometry readouts, including labeling strategies where nucleic acids are incorporated into assay constructs prior to analysis. Far-red ATTO 647N emission is leveraged to reduce interference from common autofluorescence and to support multiplex panels where multiple fluorophores are analyzed simultaneously. Laboratories that develop fluorescence-based nucleic acid assays use the reagent to generate consistent fluorescent intensity across probe lots, while the clickable handle provides an additional route to attach assay components or reporters when assay formats require conjugate assembly.

5. Surface Immobilized Hybridization Tools

5-Propargylamino-dCTP-ATTO-647N is applied in the development of immobilized nucleic acid detection formats by enabling fluorescent probe attachment to azide-functional surfaces or materials. In materials and biosensor research, the reagent's incorporation into oligonucleotides allows far-red fluorescence to serve as a traceable reporter for immobilization and assay workflow verification. Researchers use this approach to build hybridization platforms for controlled probe density and standardized imaging readouts, benefiting workflows where probe tethering and fluorescence tracking are required for assay development and optimization.