Peroxisomes as a source of reactive oxygen species and nitric oxide signal molecules in plant cells.
The important role of plant peroxisomes in a variety of metabolic reactions such as photorespiration, fatty acid beta-oxidation, the glyoxylate cycle and generation-degradation of hydrogen peroxide is well known. In recent years, the presence of a novel group of enzymes, mainly involved in the metabolism of oxygen free-radicals, has been shown in peroxisomes. In addition to hydrogen peroxide, peroxisomes can generate superoxide-radicals and nitric oxide, which are known cellular messengers with a variety of physiological roles in intra- and inter-cellular communication. Nitric oxide and hydrogen peroxide can permeate the peroxisomal membrane and superoxide radicals can be produced on the cytosolic side of the membrane. The signal molecule-generating capacity of peroxisomes can have important implications for cellular metabolism in plants, particularly under biotic and abiotic stress.
Corpas
F J
FJ
Departamento de Bioquímica, Biología Celular y Molecular de Plantas, Estación Experimental del Zaidín, CSIC, Apartado 419, E-18080 Granada, Spain. javier.corpus@eez.csis.es
Barroso
J B
JB
del Río
L A
LA
D002462:Cell Membrane / Q000502:physiology; D019069:Cell Respiration / Q000502:physiology; D005609:Free Radicals / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D009249:NADP / Q000378:metabolism; D009569:Nitric Oxide / Q000096:biosynthesis / Q000378:metabolism*; D019001:Nitric Oxide Synthase / Q000378:metabolism; D018384:Oxidative Stress / Q000502:physiology*; D020675:Peroxisomes / Q000378:metabolism*; D010944:Plants / Q000378:metabolism* / Q000648:ultrastructure; D017382:Reactive Oxygen Species / Q000378:metabolism*; D015398:Signal Transduction
D005609:Free Radicals; D017382:Reactive Oxygen Species; D009569:Nitric Oxide; D009249:NADP; D006861:Hydrogen Peroxide; D019001:Nitric Oxide Synthase