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    Wyświetlanie 1-5 z 5
    Tytuł:
    The key role of the redox status in regulation of metabolism in photosynthesizing organisms
    Autorzy:
    Kornas, Andrzej
    Kuźniak, Elżbieta
    Ślesak, Ireneusz
    Miszalski, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/1040395.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    evolution
    chloroplast
    ROS
    redox status
    photosynthesis
    hydrogen peroxide
    Opis:
    The redox status of the cell is described by the ratio of reduced to non-reduced compounds. Redox reactions which determine the redox state are an essential feature of all living beings on Earth. However, the first life forms evolved under strongly anoxic conditions of the young Earth, and the redox status probably was based on iron and sulphur compounds. Nowadays, redox reactions in cells have developed in strict connection to molecular oxygen and its derivatives i.e. reactive oxygen species (ROS). Oxygen has started to accumulate on the Earth due to oxygenic photosynthesis. All aspects of aerobic life involve ROS, reactive nitrogen species (RNS), antioxidants and redox regulation. Many different redox-active compounds are involved in the complex of redox processes, including pyridine nucleotides, thioredoxins, glutaredoxins and other thiol/disulphide-containing proteins. Redox regulation is integrated with the redox-reactions in photosynthesis and respiration to achieve an overall energy balance and to maintain a reduced state necessary for the biosynthetic pathways that are reductive in nature. It underlies the physiological and developmental flexibility in plant response to environmental signals.
    Źródło:
    Acta Biochimica Polonica; 2010, 57, 2; 143-151
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of hydrogen peroxide in regulation of plant metabolism and cellular signalling in response to environmental stresses
    Autorzy:
    Ślesak, Ireneusz
    Libik, Marta
    Karpinska, Barbara
    Karpinski, Stanislaw
    Miszalski, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/1041107.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cell wall
    cellular redox sensors
    transcription factors
    photosynthesis
    hormone signalling
    antioxidants
    acclimatory and defence responses
    reactive oxygen species (ROS) signalling
    cellular metabolism
    Opis:
    Hydrogen peroxide (H2O2) is produced predominantly in plant cells during photosynthesis and photorespiration, and to a lesser extent, in respiration processes. It is the most stable of the so-called reactive oxygen species (ROS), and therefore plays a crucial role as a signalling molecule in various physiological processes. Intra- and intercellular levels of H2O2 increase during environmental stresses. Hydrogen peroxide interacts with thiol-containing proteins and activates different signalling pathways as well as transcription factors, which in turn regulate gene expression and cell-cycle processes. Genetic systems controlling cellular redox homeostasis and H2O2 signalling are discussed. In addition to photosynthetic and respiratory metabolism, the extracellular matrix (ECM) plays an important role in the generation of H2O2, which regulates plant growth, development, acclimatory and defence responses. During various environmental stresses the highest levels of H2O2 are observed in the leaf veins. Most of our knowledge about H2O2 in plants has been obtained from obligate C3 plants. The potential role of H2O2 in the photosynthetic mode of carbon assimilation, such as C4 metabolism and CAM (Crassulacean acid metabolism) is discussed. We speculate that early in the evolution of oxygenic photosynthesis on Earth, H2O2 could have been involved in the evolution of modern photosystem II.
    Źródło:
    Acta Biochimica Polonica; 2007, 54, 1; 39-50
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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