Studies on conformational changes induced by binding of pendimethalin with human serum albumin.
Chemosphere
; 243: 125270, 2020 Mar.
Article
en En
| MEDLINE
| ID: mdl-31726261
ABSTRACT
Pendimethalin (PND) is a widely used herbicide in modern means of agricultural practices. So, its toxic residues exist extensively in the environment and can enter human body. Therefore, the in vitro interaction of PND with human serum albumin (HSA) has been explored by employing various biophysical, molecular docking and dynamics simulation studies as well as enzyme kinetics to unravel its binding mechanism. The binding constant of the PND-HSA complex was about 104â¯M-1 using Fluorescence quenching spectra. The negative value of Gibbs free energy change (ΔG0â¯=â¯-32.0â¯kJâ¯mol-1) indicates this interaction is a spontaneous process. A large negative ΔH0 and positive ΔS0 suggests that hydrophobic interactions and H-bonding are involved in the binding process of PND with HSA. The binding of PND can cause conformational and micro-environmental changes in HSA molecule, as shown by various biophysical and molecular dynamics simulation studies. The site marker competition and molecular docking and simulation experiments affirmed that the binding of PND to HSA occurs at or near site I. Esterase-like activity of HSA exhibited decline in the presence of PND revealed the direct involvement of Lys199 of subdomain IIA (Sudlow's site I) in the binding process.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Albúmina Sérica Humana
/
Compuestos de Anilina
Límite:
Humans
Idioma:
En
Revista:
Chemosphere
Año:
2020
Tipo del documento:
Article
País de afiliación:
India