Sequence-specific destabilization of azurin by tetramethylguanidinium-dipeptide ionic liquids.
Azurin
Dipeptides
Ionic liquids
Protein stability
Journal
Biochemistry and biophysics reports
ISSN: 2405-5808
Titre abrégé: Biochem Biophys Rep
Pays: Netherlands
ID NLM: 101660999
Informations de publication
Date de publication:
Jul 2022
Jul 2022
Historique:
received:
18
01
2022
revised:
18
02
2022
accepted:
02
03
2022
entrez:
14
3
2022
pubmed:
15
3
2022
medline:
15
3
2022
Statut:
epublish
Résumé
The thermal unfolding of the copper redox protein azurin was studied in the presence of four different dipeptide-based ionic liquids (ILs) utilizing tetramethylguanidinium as the cation. The four dipeptides have different sequences including the amino acids Ser and Asp: TMG-AspAsp, TMG-SerSer, TMG-SerAsp, and TMG-AspSer. Thermal unfolding curves generated from temperature-dependent fluorescence spectroscopy experiments showed that TMG-AspAsp and TMG-SerSer have minor destabilizing effects on the protein while TMG-AspSer and TMG-SerAsp strongly destabilize azurin. Red-shifted fluorescence signatures in the 25 °C correlate with the observed protein destabilization in the solutions with TMG-AspSer and TMG-SerAsp. These signals could correspond to interactions between the Asp residue in the dipeptide and the azurin Trp residue in the unfolded state. These results, supported by appropriate control experiments, suggest that dipeptide sequence-specific interactions lead to selective protein destabilization and motivate further studies of TMG-dipeptide ILs.
Identifiants
pubmed: 35280523
doi: 10.1016/j.bbrep.2022.101242
pii: S2405-5808(22)00042-5
pmc: PMC8907678
doi:
Types de publication
Journal Article
Langues
eng
Pagination
101242Informations de copyright
© 2022 The Authors.
Déclaration de conflit d'intérêts
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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