Biotin-PEG3-NHS ester (CAS 1253286-56-4)

Biotin-PEG3-NHS ester represents a multifaceted tool in the sphere of biochemical and molecular research, particularly in applications involving the targeted modification of biomolecules for the purpose of visualization, isolation, and structural analysis. The compound encompasses a biotin moiety, known for its high affinity to avidin and streptavidin proteins, linked through a polyethylene glycol (PEG) spacer (comprising three ethylene glycol units) to an N-hydroxysuccinimide (NHS) ester group. This configuration facilitates the covalent attachment of biotin to a wide array of primary amines present on proteins, nucleic acids, and other biomolecules under mild conditions, thus preserving their native structure and function. The inclusion of the PEG spacer enhances the solubility and reduces the steric hindrance around the biotin moiety, improving the accessibility of the biotin label to avidin or streptavidin in complex biological mixtures. As such, Biotin-PEG3-NHS ester serves as an indispensable reagent in the development of sophisticated bioconjugation strategies, enabling researchers to track, isolate, and analyze specific biomolecules with remarkable specificity and sensitivity. This compound thus plays a role in a wide array of applications, from elucidating molecular interactions and pathways to the engineering of biomolecular assemblies and the development of diagnostic assays.