Hydrophobic interactions of sucralose with protein structures

Copyright © 2017 Elsevier Inc. All rights reserved..

Sucralose is a commonly employed artificial sweetener that appears to destabilize protein native structures. This is in direct contrast to the bio-preservative nature of its natural counterpart, sucrose, which enhances the stability of biomolecules against environmental stress. We have further explored the molecular interactions of sucralose as compared to sucrose to illuminate the origin of the differences in their bio-preservative efficacy. We show that the mode of interactions of sucralose and sucrose in bulk solution differ subtly through the use of hydration dynamics measurement and computational simulation. Sucralose does not appear to disturb the native state of proteins for moderate concentrations (<0.2 M) at room temperature. However, as the concentration increases, or in the thermally stressed state, sucralose appears to differ in its interactions with protein leading to the reduction of native state stability. This difference in interaction appears weak. We explored the difference in the preferential exclusion model using time-resolved spectroscopic techniques and observed that both molecules appear to be effective reducers of bulk hydration dynamics. However, the chlorination of sucralose appears to slightly enhance the hydrophobicity of the molecule, which reduces the preferential exclusion of sucralose from the protein-water interface. The weak interaction of sucralose with hydrophobic pockets on the protein surface differs from the behavior of sucrose. We experimentally followed up upon the extent of this weak interaction using isothermal titration calorimetry (ITC) measurements. We propose this as a possible origin for the difference in their bio-preservative properties.

Medienart:

E-Artikel

Erscheinungsjahr:

2018

Erschienen:

2018

Enthalten in:

Zur Gesamtaufnahme - volume:639

Enthalten in:

Archives of biochemistry and biophysics - 639(2018) vom: 01. Feb., Seite 38-43

Sprache:

Englisch

Beteiligte Personen:

Shukla, Nimesh [VerfasserIn]
Pomarico, Enrico [VerfasserIn]
Hecht, Cody J S [VerfasserIn]
Taylor, Erika A [VerfasserIn]
Chergui, Majed [VerfasserIn]
Othon, Christina M [VerfasserIn]

Links:

Volltext

Themen:

57-50-1
96K6UQ3ZD4
Disaccharide
EC 3.2.1.17
Hydration dynamics
Hydrophobic-hydrophobic interaction
Journal Article
Kosmotrope
Muramidase
Osmolyte
Preferential exclusion
Protein stability
Research Support, Non-U.S. Gov't
Solvation
Sucralose
Sucrose
Time-resolved fluorescence up-conversion spectroscopy
Trichlorosucrose

Anmerkungen:

Date Completed 14.02.2018

Date Revised 14.02.2018

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1016/j.abb.2017.12.013

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM279514255