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Evidence of Simultaneous Spectral Hole Burning Involving Two Tiers of the Protein Energy Landscape in Cytochrome b6f.

Author(s): Shafiei G, Levenberg A, Lujan MA, Picorel R, Zazubovich V

J Phys Chem B. 2019 Dec 12;: Authors: Shafiei G, Levenberg A, Lujan MA, Picorel R, Zazubovich V

Article GUID: 31763829
Probing Energy Landscapes of Cytochrome b6f with Spectral Hole Burning: Effects of Deuterated Solvent and Detergent.

Author(s): Levenberg A, Shafiei G, Lujan MA, Giannacopoulos S, Picorel R, Zazubovich V

J Phys Chem B. 2017 10 26;121(42):9848-9858 Authors: Levenberg A, Shafiei G, Lujan MA, Giannacopoulos S, Picorel R, Zazubovich V

Article GUID: 28956922
Human Mesenchymal Stem Cells Impact Th17 and Th1 Responses Through a Prostaglandin E2 and Myeloid-Dependent Mechanism.

Author(s): Rozenberg A, Rezk A, Boivin MN, Darlington PJ, Nyirenda M, Li R, Jalili F, Winer R, Artsy EA, Uccelli A, Reese JS, Planchon SM, Cohen JA, Bar-Or A

Stem Cells Transl Med. 2016 Nov;5(11):1506-1514 Authors: Rozenberg A, Rezk A, Boivin MN, Darlington PJ, Nyirenda M, Li R, Jalili F, Winer R, Artsy EA, Uccelli A, Reese JS, Planchon SM, Cohen JA, Bar-Or A

Article GUID: 27400792
Hypertension management research priorities from patients, caregivers, and healthcare providers: A report from the Hypertension Canada Priority Setting Partnership Group.

Author(s): Khan N, Bacon SL, Khan S, Perlmutter S, Gerlinsky C, Dermer M, Johnson L, Alves F, McLean D, Laupacis A, Pui M, Berg A, Flowitt F, Hypertens...

J Clin Hypertens (Greenwich). 2017 Nov;19(11):1063-1069 Authors: Khan N, Bacon SL, Khan S, Perlmutter S, Gerlinsky C, Dermer M, Johnson L, Alves F, McLean D, Laupacis A, Pui M, Berg A, Flowitt F, ...

Article GUID: 28944609
Multimodal 18F-Fluciclovine PET/MRI and Ultrasound-Guided Neurosurgery of an Anaplastic Oligodendroglioma.

Author(s): Karlberg A, Berntsen EM, Johansen H, Myrthue M, Skjulsvik AJ, Reinertsen I, Esmaeili M, Dai HY, Xiao Y, Rivaz H, Borghammer P, Solheim O, Eikenes L

World Neurosurg. 2017 Dec;108:989.e1-989.e8 Authors: Karlberg A, Berntsen EM, Johansen H, Myrthue M, Skjulsvik AJ, Reinertsen I, Esmaeili M, Dai HY, Xiao Y, Rivaz H, Borghammer P, Solheim O, Eikenes L

Article GUID: 28844925
Title:Probing Energy Landscapes of Cytochrome b6f with Spectral Hole Burning: Effects of Deuterated Solvent and Detergent.
Authors:Levenberg A,  Shafiei G,  Lujan MA,  Giannacopoulos S,  Picorel R,  Zazubovich V
Link:https://www.ncbi.nlm.nih.gov/pubmed/28956922?dopt=Abstract
Category:J Phys Chem B
PMID:28956922
Dept Affiliation: PHYSICS
1 Department of Physics, Concordia University , 7141 Sherbrooke Street West, Montreal, Quebec H4B 1R6, Canada.
2 Estacion Experimental de Aula Dei (CSIC) , Avda. Montañana 1005, 50059 Zaragoza, Spain.

Description:

Probing Energy Landscapes of Cytochrome b6f with Spectral Hole Burning: Effects of Deuterated Solvent and Detergent.

J Phys Chem B. 2017 10 26;121(42):9848-9858

Authors: Levenberg A, Shafiei G, Lujan MA, Giannacopoulos S, Picorel R, Zazubovich V

Abstract

In non-photochemical spectral hole burning (NPHB) and spectral hole recovery experiments, cytochrome b6f protein exhibits behavior that is almost independent of the deuteration of the buffer/glycerol glassy matrix containing the protein, apart from some differences in heat dissipation. On the other hand, strong dependence of the hole burning properties on sample preparation procedures was observed and attributed to a large increase of the electron-phonon coupling and shortening of the excited-state lifetime occurring when n-dodecyl ß-d-maltoside (DM) is used as a detergent instead of n-octyl ß-d-glucopyranoside (OGP). The data was analyzed assuming that the tunneling parameter distribution or barrier distribution probed by NPHB and encoded into the spectral holes contains contributions from two nonidentical components with accidentally degenerate excited state ?-distributions. Both components likely reflect protein dynamics, although with some small probability one of them (with larger md2) may still represent the dynamics involving specifically the -OH groups of the water/glycerol solvent. Single proton tunneling in the water/glycerol solvent environment or in the protein can be safely excluded as the origin of observed NPHB and hole recovery dynamics. The intensity dependence of the hole growth kinetics in deuterated samples likely reflects differences in heat dissipation between protonated and deuterated samples. These differences are most probably due to the higher interface thermal resistivity between (still protonated) protein and deuterated water/glycerol outside environment.

PMID: 28956922 [PubMed - indexed for MEDLINE]