Premium
A spectroscopic investigation into the interactions of 3′‐ O ‐carboxy esters of thymidine with bovine serum albumin
Author(s) -
Ghosh Kalyan Sundar,
Sen Shiladitya,
Sahoo Bijaya Ketan,
Dasgupta Swagata
Publication year - 2009
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.21220
Subject(s) - chemistry , circular dichroism , hydrogen bond , quenching (fluorescence) , bovine serum albumin , tryptophan , van der waals force , fourier transform infrared spectroscopy , fluorescence , protein secondary structure , fluorescence spectroscopy , hydrophobic effect , binding constant , crystallography , human serum albumin , serum albumin , binding site , stereochemistry , chromatography , organic chemistry , molecule , biochemistry , amino acid , physics , quantum mechanics
Binding studies of 3′‐O‐carboxy esters of thymidine, reported inhibitors of ribonucleases, with bovine serum albumin (BSA) have been explored in this report. Fluorescence spectroscopy in combination with Fourier transform infrared (FTIR) and circular dichroism (CD) spectroscopy have been used to determine the nature and mode of binding. The binding and quenching parameters were determined from tryptophan fluorescence quenching by Scatchard plots and modified Stern–Volmer plots. The association constants are of the order of 10 4 M −1 for both the ligands. Thermodynamic parameters suggest that apart from an initial hydrophobic association, hydrogen bonding and van der Waals interactions play a decisive role during protein‐ligand complex formation. Minor changes were observed in the secondary structures of human serum albumin (HSA) as revealed by FTIR and CD. Docking studies suggest that the ligands are close to Trp 213, which causes fluorescence quenching. © 2009 Wiley Periodicals, Inc. Biopolymers 91: 737–744, 2009. This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com