Universität zu Köln

Tacchino, Francesco ORCID: 0000-0003-2008-5956, Succurro, Antonella ORCID: 0000-0003-0227-2803, Ebenhoeh, Oliver ORCID: 0000-0002-7229-7398 and Gerace, Dario (2019). Optimal efficiency of the Q-cycle mechanism around physiological temperatures from an open quantum systems approach. Sci Rep, 9. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

The Q-cycle mechanism entering the electron and proton transport chain in oxygenic photosynthesis is an example of how biological processes can be efficiently investigated with elementary microscopic models. Here we address the problem of energy transport across the cellular membrane from an open quantum system theoretical perspective. We model the cytochrome b(6)f protein complex under cyclic electron flow conditions starting from a simplified kinetic model, which is hereby revisited in terms of a Markovian quantum master equation formulation and spin-boson Hamiltonian treatment. We apply this model to theoretically demonstrate an optimal thermodynamic efficiency of the Q-cycle around ambient and physiologically relevant temperature conditions. Furthermore, we determine the quantum yield of this complex biochemical process after setting the electrochemical potentials to values well established in the literature. The present work suggests that the theory of quantum open systems can successfully push forward our theoretical understanding of complex biological systems working close to the quantum/classical boundary.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tacchino, Francesco UNSPECIFIED orcid.org/0000-0003-2008-5956 UNSPECIFIED Succurro, Antonella UNSPECIFIED orcid.org/0000-0003-0227-2803 UNSPECIFIED Ebenhoeh, Oliver UNSPECIFIED orcid.org/0000-0002-7229-7398 UNSPECIFIED Gerace, Dario UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-127735
DOI:	10.1038/s41598-019-52842-x
Journal or Publication Title:	Sci Rep
Volume:	9
Date:	2019
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CYTOCHROME B(6)F COMPLEX; ELECTRON-TRANSFER; BC(1) COMPLEX; COHERENCE; CHEMISTRY; MODEL; FLOW Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12773