title: Study on the interactions of mapenterol with serum albumins using multi-spectroscopy and molecular docking.
abstract: The interactions of mapenterol with bovine serum albumin (BSA) and human serum albumin (HSA) have been investigated systematically using fluorescence spectroscopy, absorption spectroscopy, circular dichroism (CD) and molecular docking techniques. Mapenterol has a strong ability to quench the intrinsic fluorescence of BSA and HSA through static quenching procedures. At 291 K, the binding constants, Ka, were 1.93 × 10(3) and 2.73 × 10(3) L/mol for mapenterol-BSA and mapenterol-HAS, respectively. Electrostatic forces and hydrophobic interactions played important roles in stabilizing the mapenterol-BSA/has complex. Using site marker competitive studies, mapenterol was found to bind at Sudlow site I on BSA/HSA. There was little effect of K(+), Ca(2+), Cu(2+), Zn(2+) and Fe(3+) on the binding. The conformation of BSA/HSA was changed by mapenterol, as seen from the synchronous fluorescence spectra. The CD spectra showed that the binding of mapenterol to BSA/HSA changed the secondary structure of BSA/HSA. Molecular docking further confirmed that mapenterol could bind to Sudlow site I of BSA/HSA. According to Förster non-radiative energy transfer theory (FRET), the distances r0 between the donor and acceptor were calculated as 3.18 and 2.75 nm for mapenterol-BSA and mapenterol-HAS, respectively.
authors.affiliation: College of Chemistry, Changchun Normal University, Changchun, 130032, China.
authors.forename: Shuyun
authors.initials: S
authors.lastname: Bi
authors.affiliation: College of Chemistry, Changchun Normal University, Changchun, 130032, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhao
authors.affiliation: College of Chemistry, Changchun Normal University, Changchun, 130032, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Chemistry, Changchun Normal University, Changchun, 130032, China.
authors.forename: Huifeng
authors.initials: H
authors.lastname: Zhou
mesh_terms: D015078:2-Hydroxyphenethylamine / Q000031:analogs & derivatives* / Q000737:chemistry; D000814:Aniline Compounds / Q000737:chemistry*; D000818:Animals; D002417:Cattle; D002942:Circular Dichroism; D006801:Humans; D062105:Molecular Docking Simulation; D012709:Serum Albumin / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000814:Aniline Compounds; D012709:Serum Albumin; C583264:mapenterol; D015078:2-Hydroxyphenethylamine
keywords: circular dichroism; fluorescence; mapenterol; molecular docking; serum albumins