Fluorescence labeled proteins and antibodies might provide great advantages in the identification of their binding partners or in the observation of biological processes. They allow to visualize cellular environment, to define their function, regulation and interactions. In advanced assays, fluorescent proteins can be utilized in measuring of protein–protein interactions or conformational changes, by measuring intensity changes or FRET energy transfer. An ideal fluorescent label should be small, bright, stable, and without any perturbation to the biological system. Additionally, the fluorescence labeling should be performed at non-active site with the possibility for multiplexing and avoided to the tendency to aggregate.
Organic fluorescent dye-labeled proteins have superior properties over fluorescent protein–conjugated counterparts including, wide spectral range, smaller size, greater photostability, and higher brightness. However, dye–labeled proteins also have some limitations that their sensitivity is low due to lack of the amplification step associated with the secondary antibody, and the protein should be free of contaminants and stabilizing agents. BioActs provides a wide range of fluorophore-conjugated proteins and antibodies for a variety of biological applications.