An investigation of the molecular interactions of diacetylcurcumin with ribonuclease A.
Curcumin is a natural product with diverse pharmacological activities. Studies of curcumin and its structural derivatives have been a subject of growing interest as a result of their diverse biological activities. We report the interaction of diacetylcurcumin (DAC) with Ribonuclease A (RNase A). The binding constant of DAC with RNase A was found to be of the order of 10(4) M(-1). The intrinsic fluorescence of RNase A was quenched by DAC with a quenching constant of 2.2 x10(4) M(-1). The distance between the fluorophore of RNase A and DAC was found to be 2.6 nm, calculated from a Förster type fluorescence resonance energy transfer (FRET). Secondary structural changes of RNase A after binding were analyzed from circular dichroism and Fourier transform infrared studies. Protein-ligand docking studies were conducted to determine the residues involved in the interaction of RNase A with DAC and changes in the accessible surface of the interacting residues were calculated accordingly.
Sahoo
Bijaya Ketan
BK
Department of Chemistry, Indian Institute of Technology, Kharagpur, India.
Ghosh
Kalyan Sundar
KS
Dasgupta
Swagata
S
D001665:Binding Sites; D003474:Curcumin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D008024:Ligands; D012259:Ribonuclease, Pancreatic / Q000737:chemistry / Q000378:metabolism*
D008024:Ligands; C493686:diacetylcurcumin; D012259:Ribonuclease, Pancreatic; D003474:Curcumin