Molecular modelling studies of photosynthetic electron transfer components

  • 1.76 MB
  • English
UMIST , Manchester
StatementA.J. MacFarlane ; supervised by P.J. O"Malley.
ContributionsO"Malley, P.J., Chemistry.
ID Numbers
Open LibraryOL20160544M

Molecular Biology studies the biological processes at the molecular level, particularly with respect to the physical-chemical properties and changes of cellular components and their relationship.

A clear, concise and vivid account of the process of photosynthesis is presented in this enlarged and fully revised sixth edition. The attractive presentation of this book, including the frequent use of line illustrations and color plates, leads the reader into a fascinating introduction to this sometimes complex topic.

The details of photosynthetic processes at the macro and molecular level 4/5(2). Francia F., Turina P., Melandri B.A., Venturoli G. () The Molecular Role of the PufX Protein in Bacterial Photosynthetic Electron Transfer.

In: Nicolini C. (eds) Biophysics of Electron Transfer and Molecular Bioelectronics. Electronics and Biotechnology Advanced (EL.B.A.) Forum Series, vol 3. Springer, Boston, MACited by: 2. Molecular modelling studies were carried out to clarify the relationship between molecular topology and experimentally determined rates of intramolecular electron and energy transfer in these systems.

Electron transfer from the primary donor P* to the intermediated acceptor H$\sb{\rm A}$ was simulated, using the method of molecular dynamics, for wild type reaction centers from the photosynthetic bacterum Rhodopseudomonas viridis and for three "mutant" : Xutong Wang.

Studies of a series of carotenoporphyrin-quinone triads have yielded information concerning the dependence of photoinitiated electron transfer rates on molecular structure, and have revealed that the resulting long-lived charge separated states return to the neutral ground state via a two-step by:   The artificial photosynthetic constructs described in this Account consist primarily of covalently linked synthetic chromophores, electron donors and acceptors, and proton donors and acceptors that carry out the light absorption, electron transfer, and proton-coupled electron transfer (PCET) processes characteristic of photosynthetic by: ADVERTISEMENTS: In this article we will discuss about the subject-matter and components of electron transport chain.

Subject Matter of Electron Transport Chain: The primary function in photosynthesis is the raising of an electron to a higher energy level in chlorophyll.

Then the electron is transferred to an acceptor. It is, as if, there is a [ ]. Molecular modelling of electron transfer systems by noncovalently linked porphyrin–acceptor pairing. Takashi Hayashi and Hisanobu Ogoshi Abstract. In the respiratory system, electron carriers such as ubiqui-none and cytochrome c play an important role in the electron transfer (ET) reaction between oxidoreductases embedded in the Cited by: The same non-linear mechanism of self-organization which we have proposed to explain the high directionality of charge separation and the negative Arrhenius behavior of photosynthetic electron transfer by assuming a feedback loop just in the active electron transfer branch (Fig.

3, left) [6], may also explain the nearly symmetric molecular Cited by: This volume brings together the expertise and enthusiasm of an international panel of leading cyanobacterial researchers to provide a state-of-the art overview of the field.

Topics covered include: evolution, comparative genomics, gene transfer, molecular ecology and environmental genomics, stress responses, bioactive compounds, circadian clock, structure of the photosynthetic apparatus.

The design of robust and inexpensive molecular photocatalysts for the conversion of abundant stable molecules like H2O and CO2 into an energetic carrier is one of the major fundamental questions for scientists nowadays.

The outstanding challenge is to couple single photoinduced charge separation events with 28th International Conference on Photochemistry (ICP )Cited by: 3. ELECTRON TRANSFER IN PROTEINS Harry B. Gray and Jay R. Winkler Annual Review of Biochemistry Quantum Coherence in Photosynthetic Light Harvesting Akihito Ishizaki and Graham R.

Fleming Annual Review of Condensed Matter Physics Electrostatic Interactions in Macromolecules: Theory and Applications Kim A. Sharp and Barry HonigCited by: Electron Transfer in Chemistry and Biology - The Primary Events in Photosynthesis V Krishnan One of the most important chemical reactions is electron transfer from one atomic/molecular unit to another.

This reaction, accompanied by proton and hydrogen atom transfers, occurs in a cascade in many biological processes, including photosynthesis. As the most fundamental life process on earth, photosynthesis is the focus of a vast body of research, spanning studies of femtosecond reactions at the molecular level through to field studies requiring a whole season of observation.

This is the first advanced-level treatment which covers the broad range of the topic within a single volume, so providing a uniquely comprehensive, authoritative /5(2).

Electron transfer (ET) is the key process in light-driven charge separation reactions in organic solar cells. The current review summarizes the progress in theoretical modelling of ET in these.

Introduction. The processes of charge separation in photosynthetic reaction centers (RC) and further transfer of electron and proton along the photosynthetic chain are accompanied by generation of transmembrane electric potential difference (Δψ) that can be detected using instrumental direct electrometric method suggested in our laboratory at the Belozersky Institute of Cited by: Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities.

This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water – hence the name photosynthesis, from the Greek phōs (), "light", and sunthesis (σύνθεσις. Process of exciton and electron transfer at reaction center 1) Each "antenna" (chlorophyll/accessory pigment) is capable of being excited (electron raised to a higher energy level), which will then start a chain-reaction by exciting the molecule next to it until it reaches a reaction center chlorophyll.

), and so studies on the interaction between Fd and PSI in cyanobacteria give great insight into the same interactions in higher plants. The core of PSI is composed of a PsaA/PsaB heterodimer, which harbours the reaction centre chlorophylls (P ) and the electron transfer components chlorophyll A 0, phylloquinone A 1 and [4Fe‐4S.

Classical molecular dynamics simulations are used to investigate the nuclear motions associated with photoinduced electron transfer in plastocyanin. The blue copper protein is modeled using a molecular mechanics potential; potential parameters for the copper-protein interactions are determined using an x-ray crystallographic structure and Cited by:   Electron transfer in the photosynthetic reaction center: mechanistic implications of mutagenesis studies.

Zusman LD(1), Beratan DN. Author information: (1)Department of Chemistry, University of Pittsburgh, PAUSA. A phenomenological analysis of the driving force effects in photosynthetic reaction centers modified by mutagenesis and also Cited by: 3.

us assume that the protein matrix coupled to electron transfer can be represented through N di erent oscillators where N is of the order of magnitude of the number of atoms in the protein, i.e., about in the case of the photosynthetic reaction center. We denote the frequencies of these oscillators by.

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Photoinduced electron transfer (PET) is an excited state electron transfer process by which an excited electron is transferred from donor to acceptor. Due to PET a charge separation is generated, i.e., redox reaction takes place in excited state (this phenomenon is not observed in Dexter electron transfer.

Electron transfer rates ETR (e. PS s-1) a. rETR x s(m2. PS-1) b. qP x k (s-1) k: constant rate of charge separation: ECS measurements 3. RC stoichiometry (n PSI /n PSII) ETR PSII x n PSII = ETR PSI x n PSI For a pure linear electron flow ECS measurements 4.

Oxygen evolution by PSII E 0 (mol O 2. mol chl s-1) 5. PSII Electron File Size: 2MB. electron transfer for a model of two sets of shifted harmonic oscillators [51].

The simulations of molecular geometries, and Poisson–Boltzmann computations of reorganization energies was offered [52]. The analysis allowed to estimate the 1 1 Electron Transfer Theories. 1 1 1 1 1)!.) / FGR File Size: 1MB.

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The Proceedings of the 14th International Congress on Photosynthesis is a record of the most recent advances and emerging themes in the discipline. This volume contains over contributions from some participants attending the meeting in Glasgow, UK in July These range from summary. potentials, thus making electron transfer to those cofactors favorable.

(For a general discussion, see Bjo¨rn et al. ) One of the reasons for asymmetric electron transfer between prosthetic groups located on different polypep-tides is due to different molecular dynamics on the two sides.

Our understanding of the primary processes in pho. Research on photosynthetic electron transfer closely parallels that of other electron transfer pathways and in many cases they overlap.

Thus, the first bacterial cytochrome to be characterized, called cytochromec2, is commonly found in non-sulfur purple photosynthetic bacteria and is a close homolog of mitochondrial   Ecological studies of phytoplankton use molecular techniques to evaluate the stress response of photosynthetic microorganisms in the environment In Cited by:.

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Fundamentals of Photoinduced Electron Transfer Hardcover – September 1, by George J. Karvanos (Author) See all formats and editions Hide other formats and editions. Price New from Used from Paperback "Please retry" $ $ $ Paperback $ 7 Author: George J.

Karvanos.Part V: Cyclic electron transfer components and energy coupling reactions Biogenesis of cytochromes and the cytochrome complexes Fevzi Daldal, Robert Kranz and Georg Koch Structural and mutational studies of cytochrome bc 1 complexes Edward Berry and Fevzi Daldal Mechanistic aspects of the cytochrome bc 1 complex David Kramer and.Electron Transfer in Chemistry and Biology An Introduction to the Theory Alexander M.

Kuznetsov Russian Academy of Sciences, Moscow, Russia Jens Ulstrup Technical University of Denmark, Lyngby, Denmark Electron transfer is perhaps the single most important physical event in chemical, electrochemical, photochemical, biochemical, and biophysical by: