NDLI: Models for Proton-coupled Electron Transfer in Photosystem II

Content Provider	Springer Nature Link
Author	Mayer, James M. Rhile, Ian J. Larsen, Frank B. Mader, Elizabeth A. Markle, Todd F. DiPasquale, Antonio G.
Copyright Year	2006
Abstract	The coupling of proton and electron transfers is a key part of the chemistry of photosynthesis. The oxidative side of photosystem II (PS II) in particular seems to involve a number of proton-coupled electron transfer (PCET) steps in the S-state transitions. This mini-review presents an overview of recent studies of PCET model systems in the authors’ laboratory. PCET is defined as a chemical reaction involving concerted transfer of one electron and one proton. These are thus distinguished from stepwise pathways involving initial electron transfer (ET) or initial proton transfer (PT). Hydrogen atom transfer (HAT) reactions are one class of PCET, in which H$^{+}$ and e $^{−}$ are transferred from one reagent to another: AH+B→A+BH, roughly along the same path. Rate constants for many HAT reactions are found to be well predicted by the thermochemistry of hydrogen transfer and by Marcus Theory. This includes organic HAT reactions and reactions of iron-tris(α-diimine) and manganese-(μ-oxo) complexes. In PS II, HAT has been proposed as the mechanism by which the tyrosine Z radical (Y$_{Z}$) oxidizes the manganese cluster (the oxygen evolving complex, OEC). Another class of PCET reactions involves transfer of H$^{+}$ and e $^{−}$ in different directions, for instance when the proton and electron acceptors are different reagents, as in AH–B+C$^{+}$→A–HB$^{+}$+C. The oxidation of Y$_{Z}$ by the chlorophyll P680 + has been suggested to occur by this mechanism. Models for this process – the oxidation of phenols with a pendent base – are described. The oxidation of the OEC by Y$_{Z}$ could also occur by this second class of PCET reactions, involving an Mn–O–H fragment of the OEC. Initial attempts to model such a process using ruthenium-aquo complexes are described.
Starting Page	3
Ending Page	20
Page Count	18
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	87
Issue Number	1
e-ISSN	15735079
Language	English
Publisher	Springer Netherlands
Publisher Date	2006-01-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	electron transfer hydrogen atom transfer Marcus theory oxidation phenol Photosystem II proton transfer proton-coupled electron transfer ruthenium tyrosine water Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Models for Proton-Coupled Electron Transfer in Photosystem II

Oxidative photosynthetic water splitting: energetics, kinetics and mechanism

Models for Proton-Coupled Electron Transfer in Photosystem II

H-transfers in Photosystem II: what can we learn from recent lessons in the enzyme community?

Substrate water binding and oxidation in photosystem II

Proton-Coupled Electron Transfer versus Hydrogen Atom Transfer: Generation of Charge-Localized Diabatic States

Driving Multi-electron Reactions with Photons: Dinuclear Ruthenium Complexes Capable of Stepwise and Concerted Multi-electron Reduction

The inhibitory effects of acidification and augmented oxygen pressure on water oxidation

Photochemical tyrosine oxidation with a hydrogen-bonded proton acceptor by bidirectional proton-coupled electron transfer

Models for Proton-coupled Electron Transfer in Photosystem II

Similar Documents

Models for Proton-Coupled Electron Transfer in Photosystem II

Oxidative photosynthetic water splitting: energetics, kinetics and mechanism

Models for Proton-Coupled Electron Transfer in Photosystem II

H-transfers in Photosystem II: what can we learn from recent lessons in the enzyme community?

Substrate water binding and oxidation in photosystem II

Proton-Coupled Electron Transfer versus Hydrogen Atom Transfer: Generation of Charge-Localized Diabatic States

Driving Multi-electron Reactions with Photons: Dinuclear Ruthenium Complexes Capable of Stepwise and Concerted Multi-electron Reduction

The inhibitory effects of acidification and augmented oxygen pressure on water oxidation

Photochemical tyrosine oxidation with a hydrogen-bonded proton acceptor by bidirectional proton-coupled electron transfer

Models for Proton-coupled Electron Transfer in Photosystem II