Conformational changes of serum albumin induced by ascorbic acid

Area of Science:

• Biochemistry
• Protein-ligand interactions
• Oxidative stress

Background:

• Ascorbic acid (AA), a vital antioxidant, is prone to autooxidation.
• Understanding factors that modulate AA stability is crucial for biological and pharmaceutical applications.
• Bovine serum albumin (BSA) is a common protein with diverse biological roles.

Purpose of the Study:

• To investigate the effect of Bovine serum albumin (BSA) on the autooxidation rate of ascorbic acid (AA) at physiological pH.
• To explore the potential interaction and binding between AA and BSA.

Main Methods:

• Measurement of ascorbic acid (AA) autooxidation rates in the presence and absence of Bovine serum albumin (BSA) at physiological pH.
• Spectroscopic analysis using u.v. difference spectroscopy to detect AA:BSA complex formation.

Main Results:

• Bovine serum albumin (BSA) demonstrated significant inhibition of ascorbic acid (AA) autooxidation, reducing the rate by 85% at 1 microM concentration.
• UV difference spectroscopy revealed a decrease in absorbance at 204 nm for the AA:BSA complex, indicating binding.
• The observed data suggest AA binds to BSA, inducing a conformational change in the BSA molecule.

Conclusions:

• Bovine serum albumin (BSA) acts as an effective inhibitor of ascorbic acid (AA) autooxidation under physiological conditions.
• Evidence supports a direct binding interaction between ascorbic acid (AA) and Bovine serum albumin (BSA).
• The binding of AA to BSA induces detectable conformational changes in the BSA structure.