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Title: The effects of high concentrations of ionic liquid on GB1 protein structure and dynamics probed by high-resolution magic-angle-spinning NMR spectroscopy

Journal Article · · Biochemistry and Biophysics Reports
 [1];  [2];  [3];  [3];  [4];  [3]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Boise State Univ., Boise, ID (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Univ. of Wyoming, Laramie, WY (United States)
  4. Texas Christian Univ., Fort Worth, TX (United States)

Ionic liquids have great potential in biological applications and biocatalysis, as some ionic liquids can stabilize proteins and enhance enzyme activity, while others have the opposite effect. However, on the molecular level, probing ionic liquid interactions with proteins, especially in solutions containing high concentrations of ionic liquids, has been challenging. In the present work the 13C, 15N-enriched GB1 model protein was used to demonstrate applicability of high-resolution magic-angle-spinning (HR-MAS) NMR spectroscopy to investigate ionic liquid-protein interactions. Effect of an ionic liquid (1-butyl-3-methylimidazolium bromide, [C4-mim]Br) on GB1was studied over a wide range of the ionic liquid concentrations (0.6-3.5 M, which corresponds to 10-60% v/v). Interactions between GB1 and [C4-mim]Br were observed from changes in the chemical shifts of the protein backbone as well as the changes in 15N ps-ns dynamics and rotational correlation times. Site-specific interactions between the protein and [C4-mim]Br were assigned using 3D methods under HR-MAS conditions. Furthermore, HR-MAS NMR is a viable tool that could aid in elucidation of molecular mechanisms of ionic liquid-protein interactions.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1305434
Alternate ID(s):
OSTI ID: 1373678
Report Number(s):
NREL/JA-5100-68988
Journal Information:
Biochemistry and Biophysics Reports, Vol. 8, Issue C; ISSN 2405-5808
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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