Journal ArticleDOI
Microbodies in Higher Plants
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Glyoxysome Biogenesis of Leaf Peroxisomes and Hormonal Influences: Foundations of Microbody Transition in Fatty Cotyledons.Abstract:
INTRODUCTION 159 SOURCES OF MICROBODIES: MICROBODY CONSTITUENTS 162 Glyoxysomes...... ....... ........ ... ...... ... ..... 162 Leaf Peroxisomes 164 Microbodies from Other Tissues ...... 164 DISTRIBUTION OF ENZYMES WITHIN MICROBODIES 165 ISOENZYMES IN GLYOXYSOMES AND LEAF PEROXISOMES 166 Isoenzymes of MDH 166 Isoenzymes of Citrate Synthetase 167 Isoenzymes of Aspartate-a.-Ketoglutarate Transaminase 168 FUNCTIONS OF GLYOXYSOMES AND LEAF PEROXISOMES 168 DEVELOPMENT OF MICROBODIES 170 Glyoxysome Biogenesis ..... ,", . . . . . . . . . . . . . . ,. 170 Biogenesis of Leaf Peroxisomes 176 Microbody Transition in Fatty Cotyledons 177 Hormonal Influences 185 CONCLUSIONS , ...... , 186read more
Citations
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Journal ArticleDOI
Oxygen Stress and Superoxide Dismutases
TL;DR: The accumulation of dioxygen in Earth's atmosphere allowed for the evolution of aerobic organisms that use O2 as the terminal electron acceptor, thus providing a higher yield of energy compared with fermentation and anaerobic respiration.
Journal ArticleDOI
Active oxygen species and antioxidants in seed biology
TL;DR: Active oxygen species, which occurs during seed desiccation, germination and ageing, may lead to oxidative stress and cellular damage, resulting in seed deterioration, but cells are endowed with detoxifying enzymes and antioxidant compounds that scavenge AOS and participate in seed survival.
Journal ArticleDOI
Carcinogenesis by Hepatic Peroxisome Proliferators: Evaluation of the Risk of Hypolipidemic Drugs and Industrial Plasticizers to Humans
TL;DR: The possible mechanism(s) by which peroxisome proliferators induce liver tumors will be outlined and particular attention will be paid to the possible role of perxisome proliferation-mediated radical toxicity and generation of endogenous initiators of carcinogenesis.
Journal ArticleDOI
Biochemical and developmental characterization of multiple forms of catalase in tobacco leaves.
Evelyn A. Havir,Neil A. McHale +1 more
TL;DR: All forms of catalase in tobacco show peroxidatic (measured as ethanol to acetaldehyde conversion) as well as catalatic activities, however, for both Nicotiana species the ratio per oxidatic/catalatic activity is at least 30-fold higher in peak 3 than in peaks 1 and 2.
References
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Journal ArticleDOI
Mitochondria and glyoxysomes from castor bean endosperm. Enzyme constitutents and catalytic capacity.
T. G. Cooper,Harry Beevers +1 more
TL;DR: With the use of isolated particle preparations, isotopic evidence supporting this conclusion that all enzymatic activities observed in the glyoxysome are sufficient to support rates of acetate metabolism that are greater than those known to be occurring in the intact tissue is obtained.
Journal ArticleDOI
Peroxisomes from Spinach Leaves Containing Enzymes Related to Glycolate Metabolism
TL;DR: Up to 55% of the activity for these enzymes in spinach leaves have been found in the particulate fractions after the initial centrifugation, suggesting the leaf peroxisomes are probably the site of oxygen uptake during photorespiration.
Journal ArticleDOI
Association of the glyoxylate cycle enzymes in a novel subcellular particle from castor bean endosperm
R. W. Breidenbach,Harry Beevers +1 more
Journal ArticleDOI
β Oxidation in Glyoxysomes from Castor Bean Endosperm
T. G. Cooper,Harry Beevers +1 more
TL;DR: Crude particulate preparations from castor bean endosperm contain most of the β oxidation activity present in initial extracts, consistent with an O2-requiring oxidation of the prosthetic group of acyl-CoA dehydrogenase to yield H2O2, which is broken down by catalase in the glyoxysome.
Journal ArticleDOI
Cytochemical localization of catalase in leaf microbodies (peroxisomes)
TL;DR: Segments of mature tobacco leaves were fixed in glutaraldehyde, incubated in medium containing 3,3'-diaminobenzidine (DAB) and hydrogen peroxide, and postfixed in osmium tetroxide to suggest that catalase is responsible for the reaction.
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