Abstract
Peroxisomes are one of the membrane-bounded organelles, and ubiquitously found in eukaryotic cells. Peroxisomes play vital metabolic function in all eukaryotes. However, the metabolisms are different depending on each organism. In higher plants, peroxisomes are responsible for β-oxidation of fatty acids, photorespiration and synthesis of the plant hormone. Hence, lack of peroxisomal enzymes usually results in remarkable phenotypes such as embryonic lethality or dwarfism under normal condition. peup1(Peroxisome unusual positioning1) in this study, shows different morphology and subcellular localization of peroxisomes with wild-type peroxisomes. In peup1 mutant, the number of peroxisomes seems to increase than wild-type. Additionally, catalases which are major peroxisomal proteins, are accumulated excessively. Notably, the specific activities of catalases in peup1 mutants is as half as these of catalases in wild-type. These results indicate that PEUP1 control the quality and quantity of the peroxisomes.
