Aggregation of trypsin and trypsin inhibitor by Al cation.
J Photochem Photobiol B
; 169: 7-12, 2017 Apr.
Article
em En
| MEDLINE
| ID: mdl-28246055
ABSTRACT
Al cation may trigger protein structural changes such as aggregation and fibrillation, causing neurodegenerative diseases. We report the effect of Al cation on the solution structures of trypsin (try) and trypsin inhibitor (tryi), using thermodynamic analysis, UV-Visible, Fourier transform infrared (FTIR) spectroscopic methods and atomic force microscopy (AFM). Thermodynamic parameters showed Al-protein bindings occur via H-bonding and van der Waals contacts for trypsin and trypsin inhibitor. AFM showed that Al cations are able to force trypsin into larger or more robust aggregates than trypsin inhibitor, with trypsin 5±1 SE (n=52) proteins per aggregate and for trypsin inhibitor 8.3±0.7 SE (n=118). Thioflavin T test showed no major protein fibrillation in the presence of Al cation. Al complexation induced more alterations of trypsin inhibitor conformation than trypsin.
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Base de dados:
MEDLINE
Assunto principal:
Tripsina
/
Inibidores da Tripsina
/
Alumínio
/
Agregação Patológica de Proteínas
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article