Recently added articles from Photochemistry and Photobiology:
Introduction to the Symposium-in-Print on Photosynthesis
Nov 01, 2008; ... Photochemistry in nature drives an incredible range of signaling pathways. Blue-light receptors, based on flavin chromophores, are found in virtually all major groups of organisms save for animals. Phytochromes abound in green plants, algae, fungi and some bacteria. Retinylidene proteins are ...
Function of ROC4 in the Efficient Repair of Photodamaged Photosystem II in Arabidopsis[dagger]
Nov 01, 2008; ... ABSTRACT ROC4 is the only cyclophilin in the chloroplast stroma. Here, we used the T-DNA knockout mutant of roc4 to study the physiological role of ROC4 in vivo in Arabidopsis thaliana. Our results showed that ROC4 is not required for the biogenesis and functional operation of ...
Effects of arc3, arc5 and arc6 Mutations on Plastid Morphology and Stromule Formation in Green and Nongreen Tissues of Arabidopsis thaliana[dagger]
Nov 01, 2008; ... ABSTRACT Mutations in the ARC3, ARC5 and ARC6 genes of Arabidopsis thaliana affect chloroplast division. We investigated whether ARC3, ARC5 and ARC6 are also involved in determining plastid morphology in nongreen tissues, where stromules, stroma-filled tubular extensions of the plastid ...
Structure-Function of the Cytochrome b^sub 6^ f Complex[dagger]
Nov 01, 2008; ... ABSTRACT The structure and function of the cytochrome b^sub 6^f complex is considered in the context of recent crystal structures of the complex as an eight subunit, 220 kDa symmetric dimeric complex obtained from the thermophilic cyanobacterium, Mastigocladus laminosus, and the green ...
The Occurrence of the psbS Gene Product in Chlamydomonas reinhardtii and in Other Photosynthetic Organisms and Its Correlation with Energy Quenching[dagger]
Nov 01, 2008; ... ABSTRACT To avoid photodamage, photosynthetic organisms have developed mechanisms to evade or dissipate excess energy. Lumen overacidification caused by light-induced electron transport triggers quenching of excited chlorophylls and dissipation of excess energy into heat. In higher ...
Regulation and Localization of Isoforms of the Aerobic Oxidative Cyclase in Chlamydomonas reinhardtii[dagger]
Nov 01, 2008; ... ABSTRACT Tetrapyrrole synthesis is complex and is regulated at several points. The aerobic oxidative cyclase catalyzes the oxidative closure of the fifth ring characteristic of all chlorophylls. Chlamydomonas reinhardtii encodes two paralogous protein components of the cyclase, which are ...
The American Society of Photobiology is proud to announce the new Editor of Photochemistry and Photobiology
Nov 01, 2008; ... The ASP Council has selected Jean Cadet of France as the next Editor-in-Chief of Photochemistry and Photobiology at its recent meeting in Burlingame. His term begins in January 2009. Dr. Cadet is the Scientific Adviser, French Atomic Energy Commission at CEA/Grenoble and Adjunct ...
Variable Photosynthetic Roles of Two Leaf-type Ferredoxins in Arabidopsis, as Revealed by RNA Interference[dagger]
Nov 01, 2008; ... ABSTRACT Ferredoxin (Fd) is the soluble protein that accepts electrons from photosystem I (PSI) and makes them available to stromal enzymes in higher plant chloroplasts. In linear electron flow, Fd mainly donates electrons to Fd:NADPH reductase (FNR) which generates NADPH for use in the ...
Editorial
Nov 01, 2008; ... Since January 2004 I have had the pleasure to serve as the Editor-in-Chief of Photochemistry and Photobiology. Starting with the next issue (January/February 2009), Jean Cadet will assume this responsibility. The last 5 years have been an exciting period for the advancement of Photochemistry and ...
Metabolic Engineering Towards the Enhancement of Photosynthesis[dagger]
Nov 01, 2008; ... ABSTRACT Photosynthetic capacity is a promising target for metabolic engineering of crop plants towards higher productivity. Crop photosynthesis is limited by multiple factors dependent on the environmental conditions. This includes photosynthetic electron transport, regeneration of CO2 ...
Factors Controlling the Mobility of Photosynthetic Proteins[dagger]
Nov 01, 2008; ... ABSTRACT Protein diffusion in and around the photosynthetic membrane must play a crucial role in photosynthetic functions including electron transport, regulation of light-harvesting, and biogenesis, turnover and repair of membrane components. Protein mobility is controlled by a complex ...
Removal of the PsaF Polypeptide Biases Electron Transfer in Favor of the PsaB Branch of Cofactors in Triton X-100 Photosystem I Complexes from Synechococcus sp. PCC 7002[dagger]
Nov 01, 2008; ... ABSTRACT Continuous wave (CW) and transient electron paramagnetic resonance studies have implied that when PsaF is removed genetically, the double reduction of A^sub 1A^ is facile, the lifetime of A^sub 1A^^sup -^ is shorter and the ratio of fast to slow kinetic phases increases in PS I ...
Additive Effect of Mutations Affecting the Rate of Phylloquinone Reoxidation and Directionality of Electron Transfer within Photosystem I[dagger]
Nov 01, 2008; ... ABSTRACT Optical pump-probe spectroscopy in the nanosecond-microsecond timescale has been used to study the electron transfer reactions taking place within the Photosystem I reaction center of intact Chlamydomonas reinhardtii cells. The biphasic kinetics of phylloquinone (PhQ) ...
The Plastoglobule: A Bag Full of Lipid Biochemistry Tricks[dagger]
Nov 01, 2008; ... ABSTRACT Plastoglobules are lipoprotein particles contained in chloroplasts and other plastids. They have long been regarded as lipid storage droplets. New results now indicate that plastoglobules actively participate in prenylquinone and other metabolic pathways. Structural work shows ...
Hydrogen Peroxide-mediated Inactivation of Two Chloroplastic Peroxidases, Ascorbate Peroxidase and 2-Cys Peroxiredoxin[dagger]
Nov 01, 2008; ... ABSTRACT Reactive oxygen species (ROS), such as the superoxide anion and hydrogen peroxide, are generated by the photosystems because photoexcited electrons are often generated in excess of requirements for CO2 fixation and used for reducing molecular oxygen, even under normal ...
Photo-oxidative Stress Impacts the Expression of Genes Encoding Iron Metabolism Components in Chlamydomonas[dagger]
Nov 01, 2008; ... ABSTRACT Chlamydomonas, like other organisms, regulates iron assimilation very tightly through differential expression of iron assimilation components. Nevertheless, in the presence of excess iron, cells do overaccumulate iron but without an evident phenotype. As iron toxicity is ...
Photoprotection in Cyanobacteria: Regulation of Light Harvesting[dagger]
Nov 01, 2008; ... ABSTRACT To cope with a rapidly fluctuating light environment, vascular plants and algae have evolved a photoprotective mechanism that serves to downregulate the transfer of excitation energy in the light-harvesting complexes to the photosynthetic reaction centers. This process ...
Reflectance Confocal Microscopy for In Vivo Skin Imaging[dagger]
Nov 01, 2008; ... ABSTRACT Reflectance confocal microscopy (RCM) is a novel noninvasive technique for "in vivo" examination of the skin. In a confocal microscope, near- infrared light from a diode laser is focused on a microscopic skin target. As this light passes between cellular structures having ...
Chlorophyll Fluorescence Imaging for the Noninvasive Assessment of Anthocyanins in Whole Grape (Vitis vinifera L.) Bunches[dagger]
Nov 01, 2008; ... ABSTRACT The distribution of anthocyanins in grape (Vitis vinifera L.) bunches from the Sangiovese cultivar was measured nondestructively by chlorophyll fluorescence imaging using two excitation light bands at 550 and 650 nm in sequence. The pixel intensity in the derived logarithm of ...
Live Cell Surface Labeling with Fluorescent Ag Nanocluster Conjugates[dagger]
Nov 01, 2008; ... ABSTRACT DNA-encapsulated silver clusters are readily conjugated to proteins and serve as alternatives to organic dyes and semiconductor quantum dots. Stable and bright on the bulk and single molecule levels, Ag nanocluster fluorescence is readily observed when staining live cell ...