Phalloidin-ATTO 490LS

Phalloidin-ATTO 490LS is a fluorescent phallotoxin conjugate designed for actin cytoskeleton visualization. The ATTO 490LS fluorophore provides bright green-to-cyan emission for microscopy workflows, while the phalloidin scaffold enables strong binding to filamentous actin (F-actin). This reagent is widely used to map actin organization in fixed cells and to support quantitative imaging readouts in cytoskeletal assays.

1. F-Actin Fluorescence Microscopy

Phalloidin-ATTO 490LS is used by cell biology laboratories to stain filamentous actin in fixed specimens for fluorescence microscopy. Researchers apply it to visualize stress fibers, cortical actin, and actin-rich structures such as filopodia and lamellipodia, enabling direct comparison of cytoskeletal architecture across experimental conditions. The ATTO 490LS emission is well suited for standard confocal and widefield imaging setups, supporting multi-channel experiments where actin labeling is required alongside other fluorophores.

2. Cytoskeleton Quantification Assays

Phalloidin-ATTO 490LS supports image-based quantification of actin remodeling in cell motility, adhesion, and mechanobiology studies. By providing uniform F-actin labeling, it is commonly incorporated into workflows that quantify filament density, alignment, or changes in actin morphology using automated image analysis pipelines. This makes the reagent useful for screening and assay development in laboratories that need consistent actin staining for reproducible fluorescence readouts.

3. Fixed-Cell Actin Localization Studies

Phalloidin-ATTO 490LS is frequently selected for subcellular localization studies where filamentous actin distribution is the primary endpoint. Cell and microscopy teams use it to examine actin organization in specific cellular contexts, including cell-cell and cell-matrix interaction models, where F-actin patterns reflect changes in cytoskeletal regulation. The phalloidin-based binding to F-actin helps maintain clear structural contrast, supporting downstream co-localization analyses with membrane, focal adhesion, or nuclear markers.

4. Multiplex Fluorophore Panel Imaging

Phalloidin-ATTO 490LS is often integrated into multiplex fluorescence panels for experiments that require actin labeling in combination with additional targets. Imaging teams choose this reagent when they need a distinct ATTO 490LS spectral channel for separating actin signal from other fluorophores used to label proteins, organelles, or nucleic acids. This compatibility with multi-color acquisition workflows helps streamline experimental design for cytoskeleton-focused phenotyping and co-localization studies.