title: Characterization of antioxidant enzymes and peroxisomes of olive (Olea europaea L.) fruits.
abstract: The presence of peroxisomes in olive (Olea europaea L.) fruits and different antioxidant enzymes occurring in this plant tissue is reported for the first time. Ultrastructural analysis showed that olive cells were characterized by the presence of large vacuoles and lipid drops. Plastids, mitochondria and peroxisomes were placed near the cell wall, showing some type of association with it. Olive fruit peroxisomes were purified by sucrose density-gradient centrifugation, and catalase, glutathione reductase and ascorbate peroxidase were found in peroxisomes. In olive fruit tissue the presence of a battery of antioxidant enzymes was demonstrated, including catalase, four superoxide dismutase isozymes (mainly an Fe-SOD plus 2 Cu,Zn-SOD and a Mn-SOD), all the enzymes of the ascorbate-glutathione cycle, reduced and oxidized glutathione, ascorbate, and four NADPH-recycling dehydrogenases. The knowledge of the full composition of antioxidants (enzymatic and non-enzymatic) in olive fruits is crucial to be able to understand the processes regulating the antioxidant composition of olive oil.
authors.affiliation: Group of Antioxidants, Free Radicals and Nitric Oxide in Biotechnology, Food and Agriculture, Estación Experimental del Zaidín (EEZ), Consejo Superior de Investigaciones Científicas (CSIC), Profesor Albareda 1, Granada 18008, Spain. Electronic address: eduardo.lopezhuertas@eez.csic.es.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Lopez-Huertas
authors.affiliation: Group of Antioxidants, Free Radicals and Nitric Oxide in Biotechnology, Food and Agriculture, Estación Experimental del Zaidín (EEZ), Consejo Superior de Investigaciones Científicas (CSIC), Profesor Albareda 1, Granada 18008, Spain.
authors.forename: Luis A
authors.initials: LA
authors.lastname: del Río
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D005638:Fruit / Q000201:enzymology / Q000378:metabolism; D046529:Microscopy, Electron, Transmission; D031658:Olea / Q000201:enzymology* / Q000378:metabolism; D020675:Peroxisomes / Q000201:enzymology* / Q000648:ultrastructure; D010940:Plant Proteins / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D010940:Plant Proteins
keywords: Antioxidant Enzymes; Antioxidants; Olive; Peroxisomes