Interrogating Detergent Desolvation of Nanopore-Forming Proteins by Fluorescence Polarization Spectroscopy

Aaron J. Wolfe, Yi Ching Hsueh, Adam R. Blanden, Mohammad M. Mohammad, Bach Pham, Avinash K. Thakur, Stewart N. Loh, Min Chen, Liviu Movileanu

Research output: Contribution to journalArticle

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Abstract

Understanding how membrane proteins interact with detergents is of fundamental and practical significance in structural and chemical biology as well as in nanobiotechnology. Current methods for inspecting protein-detergent complex (PDC) interfaces require high concentrations of protein and are of low throughput. Here, we describe a scalable, spectroscopic approach that uses nanomolar protein concentrations in native solutions. This approach, which is based on steady-state fluorescence polarization (FP) spectroscopy, kinetically resolves the dissociation of detergents from membrane proteins and protein unfolding. For satisfactorily solubilizing detergents, at concentrations much greater than the critical micelle concentration (CMC), the fluorescence anisotropy was independent of detergent concentration. In contrast, at detergent concentrations comparable with or below the CMC, the anisotropy readout underwent a time-dependent decrease, showing a specific and sensitive protein unfolding signature. Functionally reconstituted membrane proteins into a bilayer membrane confirmed predictions made by these FP-based determinations with respect to varying refolding conditions. From a practical point of view, this 96-well analytical approach will facilitate a massively parallel assessment of the PDC interfacial interactions under a fairly broad range of micellar and environmental conditions. We expect that these studies will potentially accelerate research in membrane proteins pertaining to their extraction, solubilization, stabilization, and crystallization, as well as reconstitution into bilayer membranes.

LanguageEnglish (US)
Pages8013-8020
Number of pages8
JournalAnalytical Chemistry
Volume89
Issue number15
DOIs
StatePublished - Aug 1 2017

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Nanopores
Detergents
Fluorescence
Spectroscopy
Polarization
Membrane Proteins
Proteins
Critical micelle concentration
Anisotropy
Nanobiotechnology
Membranes
Crystallization
Stabilization
Throughput

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Wolfe, A. J., Hsueh, Y. C., Blanden, A. R., Mohammad, M. M., Pham, B., Thakur, A. K., ... Movileanu, L. (2017). Interrogating Detergent Desolvation of Nanopore-Forming Proteins by Fluorescence Polarization Spectroscopy. Analytical Chemistry, 89(15), 8013-8020. DOI: 10.1021/acs.analchem.7b01339

Interrogating Detergent Desolvation of Nanopore-Forming Proteins by Fluorescence Polarization Spectroscopy. / Wolfe, Aaron J.; Hsueh, Yi Ching; Blanden, Adam R.; Mohammad, Mohammad M.; Pham, Bach; Thakur, Avinash K.; Loh, Stewart N.; Chen, Min; Movileanu, Liviu.

In: Analytical Chemistry, Vol. 89, No. 15, 01.08.2017, p. 8013-8020.

Research output: Contribution to journalArticle

Wolfe, AJ, Hsueh, YC, Blanden, AR, Mohammad, MM, Pham, B, Thakur, AK, Loh, SN, Chen, M & Movileanu, L 2017, 'Interrogating Detergent Desolvation of Nanopore-Forming Proteins by Fluorescence Polarization Spectroscopy' Analytical Chemistry, vol. 89, no. 15, pp. 8013-8020. DOI: 10.1021/acs.analchem.7b01339
Wolfe AJ, Hsueh YC, Blanden AR, Mohammad MM, Pham B, Thakur AK et al. Interrogating Detergent Desolvation of Nanopore-Forming Proteins by Fluorescence Polarization Spectroscopy. Analytical Chemistry. 2017 Aug 1;89(15):8013-8020. Available from, DOI: 10.1021/acs.analchem.7b01339
Wolfe, Aaron J. ; Hsueh, Yi Ching ; Blanden, Adam R. ; Mohammad, Mohammad M. ; Pham, Bach ; Thakur, Avinash K. ; Loh, Stewart N. ; Chen, Min ; Movileanu, Liviu. / Interrogating Detergent Desolvation of Nanopore-Forming Proteins by Fluorescence Polarization Spectroscopy. In: Analytical Chemistry. 2017 ; Vol. 89, No. 15. pp. 8013-8020
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