Bovine Serum Albumin

Bovine Serum Albumin (CAS No.: 9048-46-8) is a widely utilized globular protein derived from bovine blood plasma, belonging to the serum albumin family that plays a central physiological role in maintaining oncotic pressure and transporting endogenous and exogenous ligands. Structurally, it is composed of a single polypeptide chain organized into three homologous domains with multiple ligand-binding sites, enabling interactions with water, metal ions, fatty acids, hormones, and a broad spectrum of small molecules, including pharmaceutical compounds. Functionally analogous to human serum albumin, which constitutes a major fraction of plasma protein and serves as a key carrier and buffering agent, BSA is extensively employed in biochemical and biomedical research as a stabilizer, carrier protein, and blocking reagent. Its broad binding capacity underlies its utility in drug discovery for compound solubility enhancement, nonspecific binding reduction, and pharmacokinetic modeling in vitro. Modified forms, such as acetylated BSA, are commonly used as positive controls in immunoassays to study post-translational modifications, including lysine acetylation, which is regulated by histone acetyltransferases and deacetylases and plays a critical role in epigenetic signaling pathways associated with gene expression and cancer biology. Although BSA itself is not a direct pharmacological modulator with defined inhibitory constants, it participates in experimental systems by influencing ligand availability and protein–ligand interactions, typically within concentrations ranging from microgram per milliliter to milligram per milliliter depending on assay design. It is routinely applied in cell-based assays, enzymatic studies, and animal models as a formulation component or control reagent, with usage parameters tailored to specific experimental objectives in life sciences and drug development research.