ATTO 655-Streptavidin

ATTO 655-Streptavidin is a fluorescent streptavidin conjugate featuring the ATTO 655 dye for bright far-red labeling of biotin-tagged biomolecules and surfaces. This reagent is widely used in fluorescence microscopy, flow cytometry, and assay workflows where robust streptavidin-biotin binding provides strong, convenient attachment of fluorescent signal to biotinylated targets. The ATTO 655 emission supports multiplex-friendly far-red imaging when paired with compatible excitation/emission filter sets.

1. Biotinylated Target Labeling

ATTO 655-Streptavidin is routinely used to fluorescently label biotinylated proteins, peptides, and affinity reagents for downstream imaging and quantitative readouts. Researchers commonly apply it to visualize binding events, track immobilized biomolecules on assay plates or membranes, and generate consistent fluorescent conjugates without requiring additional dye conjugation chemistry for each target. Because streptavidin binds biotin with high affinity, the reagent is a practical choice for workflows that need stable labeling of biotinylated constructs such as biotinylated antibodies, ligands, or engineered binding partners.

2. Fluorescence Microscopy Staining

ATTO 655-Streptavidin supports far-red fluorescence microscopy experiments where biotinylated components are used to mark cellular structures, extracellular targets, or engineered biomaterials. Investigators often incorporate the conjugate into staining panels to visualize biotin-tagged probes alongside other fluorophores, leveraging ATTO 655's emission to reduce spectral overlap in multi-channel imaging. The reagent is also used for labeling immobilized biotinylated biomolecules on coverslips, hydrogels, and other prepared substrates, enabling spatial localization studies in cell biology and chemical biology.

3. Flow Cytometry Detection

ATTO 655-Streptavidin is used in flow cytometry to quantify biotinylated targets on cell surfaces or in binding assays that generate biotinylated readouts. Typical workflows include labeling biotinylated antibodies or ligands followed by staining with the fluorescent streptavidin conjugate to convert binding into a measurable fluorescence signal. The far-red ATTO 655 signal is particularly useful when designing multi-color panels that require a fluorophore with compatible excitation/emission characteristics for common cytometers and analysis software.

4. Streptavidin-Based Assay Reagents

ATTO 655-Streptavidin is frequently incorporated into fluorescence-based assay development where biotinylated capture reagents, detection probes, or standards are used to build signal-generating formats. Researchers use the conjugate to generate fluorescent readouts in binding assays, platform screening, and workflow validation steps that rely on streptavidin-biotin coupling rather than dyeing each reagent individually. In these settings, ATTO 655-Streptavidin provides a convenient fluorescent reporter for plate-based measurements and imaging-compatible assay formats that use biotinylated components.