Cysteines in ß-lactoglobulin affects its interfacial adsorption and protein film stabilization.
J Colloid Interface Sci
; 677(Pt A): 217-230, 2025 Jan.
Article
em En
| MEDLINE
| ID: mdl-39089128
ABSTRACT
HYPOTHESIS:
Disulfide bonds in proteins are strong chemical bonds forming the secondary and tertiary structure like in the dairy protein ß-lactoglobulin. We hypothesize that the partial or complete removal of disulfide bonds affects the structural rearrangement of proteins caused by intra- and intermolecular interactions that in turn define the interfacial activity of proteins at oil/water interfaces. The experimental and numerical investigations contribute to the mechanistic understanding of the structure-function relationship, especially for the interfacial adsorption behavior of proteins. EXPERIMENTAL AND NUMERICAL Systematically, the 5 cysteines of ß-lactoglobulin were recombinantly exchanged by alanine. First, the protein structure of the variants in bulk was analyzed with Fourier-transform-infrared-spectroscopy and molecular dynamic simulations. Second, the structural changes after adsorption to the interface have been also analyzed by molecular dynamic simulations. The adsorption behavior was investigated by pendant drop analysis and the interfacial film properties by dilatational rheology.FINDINGS:
The structural flexibility of ß-lactoglobulin with no cysteines encourages its unfolding at the interface, and accelerates the interfacial protein film formation that results in more visco-elastic films in comparison to the reference.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cisteína
/
Simulação de Dinâmica Molecular
/
Lactoglobulinas
Idioma:
En
Revista:
J Colloid Interface Sci
/
J. colloid interface sci
/
Journal of colloid and interface science
Ano de publicação:
2025
Tipo de documento:
Article
País de publicação:
Estados Unidos