ATTO Rho13 maleimide

ATTO Rho13 maleimide is a thiol-reactive fluorescent labeling reagent designed for covalent attachment to cysteine-containing biomolecules via maleimide chemistry. The ATTO Rho13 fluorophore provides bright red/orange emission for fluorescence microscopy and flow cytometry workflows, enabling robust visualization of labeled proteins, peptides, and other sulfhydryl-bearing targets. Its dye-to-biomolecule conjugation is commonly used in chemical biology, labeling optimization, and fluorescence-based assay development where stable conjugates are required.

1. Protein And Peptide Labeling

ATTO Rho13 maleimide is frequently used by protein chemistry and chemical biology groups to generate fluorescently labeled proteins and peptides for downstream imaging and quantitative fluorescence readouts. Researchers typically introduce accessible thiol groups (for example, engineered cysteines or reduced disulfides) and then label with the maleimide reagent to obtain covalent dye conjugates that resist dye loss during washing steps. Labeled proteins prepared from ATTO Rho13 maleimide are commonly used to track binding and localization in microscopy experiments, to support fluorescence-based binding studies, and to generate fluorescent standards for assay calibration.

2. Flow Cytometry Staining

ATTO Rho13 maleimide supports fluorescence labeling workflows for flow cytometry where red/orange-emitting conjugates are used to quantify biomolecule association with cells or particles. In practical cytometry applications, investigators label thiol-containing targeting reagents or carrier proteins and then use the resulting ATTO Rho13 conjugates to stain cell-associated targets, enabling single-sample comparisons across experimental conditions. The covalent maleimide labeling approach helps maintain signal during sample preparation and washing, which is particularly valuable when conjugates must remain stable through multi-step staining protocols.

3. Fluorescent Probe Construction

ATTO Rho13 maleimide is widely applied in fluorescent probe development for constructing dye-labeled reagents used in molecular imaging and biochemical assays. By attaching the ATTO Rho13 fluorophore to thiol-bearing components, researchers build modular probe conjugates such as fluorescent reporters for monitoring biomolecular interactions, labeling reagents for assay substrates, and multicomponent imaging tools that require a defined fluorophore handle. This labeling strategy is also used to prepare conjugates for platform development where the fluorophore must be tethered to the recognition or reporting element rather than relying on noncovalent dye association.

4. Biomolecule Conjugates For Imaging

ATTO Rho13 maleimide is used to produce covalent fluorescent conjugates for cellular and subcellular imaging experiments, particularly when labeled biomolecules need to withstand fixation and repeated washes. Imaging-focused teams commonly label thiol-containing biomolecules that serve as structural markers, interaction partners, or visualization tags, then image the resulting ATTO Rho13 conjugates using standard fluorescence microscopy channels matched to the dye's emission. The maleimide-driven conjugation provides a straightforward route to generate stable, covalently attached fluorescent labeling reagents for comparative imaging across experimental time points.