Bovine serum albumin subdomain IIA (BSA Subdomain IIA)

Bovine serum albumin (BSA) is a major plasma protein in cattle that serves as a primary carrier for a wide range of endogenous and exogenous ligands. Subdomain IIA, also known as Sudlow's site I or the warfarin binding site, is a prominent hydrophobic pocket within the protein structure that specifically binds bulky heterocyclic anions [2][4]. This subdomain is of significant interest in pharmacology because it is a major determinant of the pharmacokinetics of many drugs, influencing their distribution, metabolism, and excretion [3]. BSA is frequently used as a structural and functional model for human serum albumin (HSA) in drug-binding studies due to their high sequence homology and similar binding site architectures [4]. The interaction of drugs with subdomain IIA can lead to competitive displacement, which is a critical factor in understanding and predicting drug-drug interactions [2]. Furthermore, the presence of a single tryptophan residue (Trp-213) in this subdomain makes it a valuable tool for monitoring ligand binding through fluorescence spectroscopy [4]. References: [1] UniProt (P02769); [2] Sudlow et al. (1975) Mol Pharmacol 11(6):824-32; [3] Peters (1996) All About Albumin: Biochemistry, Genetics, and Medical Applications; [4] Majorek et al. (2012) Mol Immunol 52(3-4):174-82.

Other names

Sudlow's site IWarfarin binding siteBSA Site IDomain IIA of Bovine serum albumin

Drugs interact with subdomain IIA primarily through reversible binding within its large hydrophobic pocket, which serves to transport the drug through the circulatory system, protect it from rapid metabolism, and regulate its free concentration in the plasma [2][3].