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Reaction Cycle of Operating Pump Protein Studied with Single-Molecule Spectroscopy

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Title
Reaction Cycle of Operating Pump Protein Studied with Single-Molecule Spectroscopy
Author(s)
Saurabh Talele; John T. King
Publication Date
2022-11
Journal
CHEMPHYSCHEM, v.23, no.21
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Biological machinery relies on nonequilibrium dynamics to maintain stable directional fluxes through complex reaction cycles. For such reaction cycles, the presence of microscopically irreversible conformational transitions of the protein, and the accompanying entropy production, is of central interest. In this work, we use multidimensional single-molecule fluorescence lifetime correlation spectroscopy to measure the forward and reverse conformational transitions of bacteriorhodopsin during trans-membrane H+ pumping. We quantify the flux, affinity, enthalpy and entropy production through portions of the reaction cycle as a function of temperature. We find that affinity of irreversible conformational transitions decreases with increasing temperature, resulting in diminishing flux and entropy production. We show that the temperature dependence of the transition affinity is well fit by the Gibbs-Helmholtz relation, allowing the Delta H-trans to be experimentally extracted.
URI
https://pr.ibs.re.kr/handle/8788114/12814
DOI
10.1002/cphc.202200099
ISSN
1439-4235
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > 1. Journal Papers (저널논문)
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