Atto conjugated antibodies are primary or secondary antibodies chemically linked to Atto fluorophores, a family of bright fluorescent dyes widely used in microscopy, flow cytometry, and single-molecule detection. These conjugates are designed to provide strong signal intensity, high photostability, and reliable performance in multiplex experiments. They are especially useful when sensitive detection and low background are important.

Fluorescent Properties

Atto dyes are known for their high brightness and resistance to photobleaching, which makes them suitable for demanding imaging applications. Depending on the specific dye variant, Atto conjugates can cover different excitation and emission wavelengths, allowing researchers to match them to available laser lines and filter sets. This flexibility makes them valuable in multicolor experimental designs.

Antibody Conjugation

The antibody is covalently linked to the fluorophore through a controlled chemical labeling process that preserves antigen-binding activity as much as possible. Common Atto-labeled formats include Atto 488, Atto 550, Atto 565, Atto 647N, and Atto 700 conjugates. The choice of dye depends on the instrument configuration, required brightness, and overlap with other fluorophores in the panel.

Applications in Research

Atto conjugated antibodies are widely used in immunofluorescence, confocal microscopy, super-resolution imaging, and flow cytometry. They are particularly useful for detecting low-abundance proteins, defining cellular compartments, and analyzing complex marker panels. In many cases, they offer improved signal stability compared with standard fluorophores during prolonged imaging sessions.