Multi-spectroscopic investigation of the interactions

between cholesterol and human serum albumin.

M.M.Abu Teir^*, J.Ghithan, S.Darwish, M.M.Abu-hadid

Abstract:

The interaction between cholesterol and human serum albumin has been investigated. The basic binding interaction was studied by UV-absorption and fluorescence spectroscopy. From spectral analysis cholesterol showed a strong ability to quench the intrinsic fluorescence of HSA through a static quenching mechanism. The binding constant (k) is estimated to be K=0.214 × 10⁴ M^-1  at 293 K. FTIR spectroscopy with Fourier self-deconvolution technique was used to determine the protein secondary structure and cholesterol binding mechanisms. The observed spectral changes indicate a higher percentage of H-bonding between cholesterol and a-helix (secondary structure motif in HSA) compared to the percentage of H-bonding between cholesterol and b-sheets (secondary structure motif in HSA). read full article…