ATTO 514 iodoacetamide

ATTO 514 iodoacetamide is a thiol-reactive fluorescent labeling reagent built on the ATTO 514 dye scaffold, enabling covalent tagging of cysteine-containing biomolecules through iodoacetamide chemistry. Its red-shifted emission is commonly leveraged for multicolor fluorescence workflows where robust, dye-based visualization of protein and peptide conjugates is required. Researchers use this reagent to introduce a bright fluorescent handle onto sulfhydryl-containing targets for downstream imaging, quantification, and probe construction.

1. Protein Cysteine Labeling

ATTO 514 iodoacetamide is frequently used to fluorescently label proteins, peptides, and other cysteine-rich bioconjugation targets in chemical biology workflows. Because the reagent reacts with accessible thiols, it supports site-selective tagging strategies for purified proteins, enzyme preparations, and engineered constructs containing reactive cysteine residues. Labeled proteins prepared with ATTO 514 iodoacetamide are then used for fluorescence microscopy and quantitative fluorescence readouts in binding and interaction studies, including tracking of labeled biomolecules in solution or on immobilized surfaces.

2. Fluorescence Microscopy Staining

ATTO 514 iodoacetamide labeling is commonly adopted in fluorescence microscopy experiments where researchers need a red-emitting dye for cellular or biomolecular imaging. Labeled proteins or peptides generated with this reagent can be used to visualize localization patterns, transport or association behaviors, and extracellular or surface-associated labeling in fixed-sample imaging workflows. The ATTO 514 emission is also used to design multicolor panels by selecting a dye channel that reduces spectral overlap with other fluorophores, supporting clearer spatial interpretation in imaging experiments.

3. Flow Cytometry Conjugates

ATTO 514 iodoacetamide is used to prepare fluorescent conjugates for flow cytometry-based analysis, particularly when thiol-reactive labeling is needed to generate a stable fluorescent reagent from a protein or peptide component. Researchers often label targeting or binding proteins (or thiol-containing ligands) and then apply the resulting ATTO 514 conjugates to quantify binding to cells or cell-associated targets using standard flow cytometers with appropriate excitation/emission filters. This approach is also used during assay development to screen labeling conditions and verify conjugate performance prior to larger experimental runs.

4. Fluorescent Probe Construction

ATTO 514 iodoacetamide is widely employed as a dye-attachment step in fluorescent probe development, where a covalent fluorescent handle is required for subsequent conjugation or assay assembly. Fluorophore-labeled biomolecules prepared with ATTO 514 iodoacetamide can serve as components in FRET pair construction, fluorescence-based binding probes, or labeling reagents for biomaterial functionalization studies where a stable fluorescent reporter is needed. In these workflows, the iodoacetamide functionality provides a practical route to generate dye-labeled building blocks that retain the chemical integrity required for downstream coupling and characterization.