Fluorescence spectroscopic and dynamics simulation studies on isoorientin binding with human serum albumin

Caruso, Ícaro Putinhon [UNESP]; Vilegas, Wagner [UNESP]; Cristante de Oliveira, Leandro [UNESP]; Cornélio, Marinônio Lopes [UNESP]

Fluorescence spectroscopic and dynamics simulation studies on isoorientin binding with human serum albumin

Data

2020-03-05

Autores

Caruso, Ícaro Putinhon

Vilegas, Wagner

Cristante de Oliveira, Leandro

Cornélio, Marinônio Lopes

Tipo

Artigo

Resumo

Isoorientin (ISOO) a glycosylated flavonoid found in acai berry exhibits relevant activities such as antidiabetic and antidepressant. However, its physicochemical action on any molecular target is scarcely known. In this work, we tackle the problem about the binding of ISOO to human serum albumin (HSA) applying fluorescence spectroscopy bimodal analysis aided by computational simulations. A static quenching process was detected having hypsochromic shift with implication in the polarizability around the endogenous probe (Trp 214) during complex formation. The binding mechanism reveals that all sites are equivalents and independents with binding constant value of 9.1 × 104 M-1 and, a total of six sites accessed whereas three of them were identified experimentally. The thermodynamic evaluation indicates that the complex formation is spontaneous (ΔG<0). The dynamics and docking simulations corroborated the experimental data by adding details of each site and its respective microenvironment.