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Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
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Dodine as a Kosmo-Chaotropic Agent
Drishti Guin1, Shriyaa Mittal2, Brian Bozymski3
1Department of Chemistry , University of Illinois , Urbana , Illinois 61801 , United States.
The Journal of Physical Chemistry Letters
|April 27, 2019
Summary
Dodine protein interactions reveal a dual effect: it stabilizes helical structures while disrupting tertiary ones. This unique "kosmo-chaotrope" behavior allows for spectroscopy measurements at low concentrations.
Area of Science:
- Biochemistry
- Chemical Physics
- Structural Biology
Background:
- Protein unfolding denaturants interfere with spectroscopy.
- Dodine offers a low-concentration alternative for protein denaturation.
Purpose of the Study:
- Investigate dodine's microscopic mechanism of protein interaction.
- Probe dodine's effect on protein α-helices and tertiary structure.
Main Methods:
- Studied the stability of the small helical protein B.
- Utilized all-atom molecular dynamics simulations.
Main Results:
- Dodine promoted helical structure (kosotropic) and lost tertiary structure (chaotropic).
- Dodine destabilized native protein structure without lowering the thermal denaturation midpoint.
- Simulations revealed dodine's headgroup and tail exhibit opposing effects.
Conclusions:
- Dodine acts as a simultaneous stabilizer-destabilizer, termed a "kosmo-chaotrope".
- The Janus-like behavior of dodine's headgroup and tail explains its dual action.
- Dodine's unique properties enable spectroscopy measurements at low concentrations.
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