A model for the photosynthetic apparatus of purple bacteria
Miroslav Z. PapizA. M. Hawthornthwaite-LawlessStephen M. PrinceGerry McDermottAndy FreerNeil W. IsaacsRichard J. Cogdell
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Light-harvesting complex
A new mechanistic model of the photosynthesis-light response is developed based on photosynthetic electron transport via photosystem II (PSII) to specifically describe light-harvesting characteristics and associated biophysical parameters of photosynthetic pigment molecules. This model parameterizes 'core' characteristics not only of the light response but also of difficult to measure physical parameters of photosynthetic pigment molecules in plants. Application of the model to two C3 and two C4 species grown under the same conditions demonstrated that the model reproduced extremely well (r(2) > 0.992) the light response trends of both electron transport and CO2 uptake. In all cases, the effective absorption cross-section of photosynthetic pigment molecules decreased with increasing light intensity, demonstrating novel operation of a key mechanism for plants to avoid high light damage. In parameterizing these previously difficult to measure characteristics of light harvesting in higher plants, the model provides a new means to understand the mechanistic processes underpinning variability of CO2 uptake, for example, photosynthetic down-regulation or reversible photoinhibition induced by high light and photoprotection. However, an important next step is validating this parameterization, possibly through application to less structurally complex organisms such as single-celled algae.
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The Crystal Structure of the Photosynthetic Reaction Center from Rhodopseudomonas viridis.- Structure of the Reaction Center from Rhodobacter sphaeroides R-26 and 2.4.1.- Symmetry Breaking Structures Involved in the Docking of Cytochrome c and Primary Electron Transfer in Reaction Centers of Rhodobacter sphaeroides.- Crystallographic Studies of the Photosynthetic Reaction Center from Wild Type Rhodobacter sphaeroides (Y Strain).- Single Crystals of the Photochemical Reaction Center from Rhodobacter sphaeroides Wild Type Strain 2.4.1. Analyzed by Polarized Light.- Spectroscopic Studies of Crystallized Pigment-protein Complexes of R. palustris.- Protein-prosthetic Group Interactions in Bacterial Reaction Centers.- Circular Dichroism Spectroscopy of Photoreaction Centers.- Low Temperature Linear Dichroism Study of the Orientation of the Pigments in Reduced and Oxidized Reaction Centers of Rps. viridis and Rb. sphaeroides.- Anisotropic Magnetic Field Effects of the Photosynthetic Bacterial Reaction Center of Rhodobacter sphaeroides R-26, Studied by Linear Dichroic Magneto-optical Difference Spectroscopy (LD-MODS) in the Temperature Range 1.2-310K.- Bacterial Reaction Centers are Intrinsically Heterogeneous.- Reaction Centers of Purple Bacteria with Modified Chromophores.- Quantitative Analysis of Genetically Altered Reaction Centers Using an In Vitro Cytochrome Oxidation Assay.- Properties of Reaction Centers From the Green Photosynthetic Bacterium Chloroflexus aurantiacus.- Structural and Functional Properties of the Reaction Center of Green Bacteria and Heliobacteria.- Molecular Dynamics Simulation of the Primary Processes in the Photosynthetic Reaction Center of Rhodopseudomonas viridis.- The Stark Effect in Photosynthetic Reaction Centers from Rhodobacter sphaeroides R-26, Rhodopseudomonas viridis and the D1 D2 Complex of Photosystem II from Spinach.- The Nature of Excited States and Intermediates in Bacterial Photosynthesis.- On the Energetics of the States 1P*, 3P* and P+H? in Reaction Centers of Rb. sphaeroides.- The Possible Existence of a Charge Transfer State which Preceeds the Formation of (BChl)2+ BPh? in Rhodobacter sphaeroides Reaction Centers.- The Primary Electron Transfer in Photosynthetic Purple Bacteria: Long Range Electron Transfer in the Femtosecond Domain at Low Temperature.- The Problem of Primary Energy Conversion in Reaction Centers of Photosynthetic Bacteria.- Temperature Effects on the Ground State Absorption Spectra and Electron Transfer Kinetics of Bacterial Reaction Centers.- ENDOR of Exchangeable Protons of the Reduced Intermediate Acceptor in Reaction Centers from Rhodobacter sphaeroides R-26.- FTIR Spectroscopic Investigations of the Intermediary Electron Acceptor Photoreduction in Purple Photosynthetic Bacteria and Green Plants.- Charge Recombination at Low Temperature in Photosynthetic Bacteria Reaction Centers.- Temperature and - ?G Dependence of the Electron Transfer to and from QA in Reaction Center Protein from Rhodobacter sphaeroides.- The Effect of an Electric Field on the Charge Recombination Rate of D+QA? ? DQA in Reaction Centers from Rhodobacter sphaeroides R-26.- Pressure Effects on Electron Transfer in Bacterial Reaction Centers.- The Spectral Properties of Chlorophyll and Bacteriochlorophyll Dimers a Comparative Study.- Spectroscopic Properties and Electron Transfer Dynamics of Reaction Centers.- Analysis of A, LD, CD, ADMR and LD-ADMR Spectra for the Reaction Centers of Rps. viridis, Rb. sphaeroides, C. aurantiacus and Modified Rb. sphaeroides.- Modified-CI Model of Protein-induced Red Shifts of Reaction Center Pigment Spectra.- Temperature Dependence of the Long Wavelength Absorption Band of the Reaction Center of Rhodopseudomonas viridis.- Discussion of the Large Homogeneous Width of the P-Band in Bacterial- and Plant Reaction Centers.- Theoretical Models of Electrochromic and Environmental Effects on Bacterio-Chloropbylls and -Pheophytins in Reaction Centers.- Electrostatic Control of Electron Transfer in the Photosynthetic Reaction Center of Rhodopseudomonas viridis.- Molecular Orbital Studies on the Primary Donor P960 in Reaction Centers of Rps. viridis.- Early Steps in Bacterial Photosynthesis. Comparison of Three Mechanisms.- Mechanism of the Primary Charge Separation in Bacterial Photosynthetic Reaction Centers.- A Configuration Interaction (CI) Description of Vectorial Electron Transfer in Bacterial Reaction Centers.- Charge Transfer States and the Mechanism of Charge Separation in Bacterial Reaction Centers.- Light Reflections.
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