Oxygen-and Light-Induced Proteolysis in Isolated Oat Chloroplasts

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概要

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• The influence of light and O_2 On the degradation of proteins in isolated oat chloroplasts was studied by SDS-polyacrylamide gel electrophoresis. Proteolysis increased as irradiance and the concentration of O_2 increased. Dark treatments prevented protein degradation. Neutral and alkaline aminopeptidase activities and neutral endopeptidase activity decreased with the time and with the increase in the concentration of O_. However, acid endopeptidase activity increased as the level of O_2 increased, accounting, at least in part, for the proteolysis observed under high irradiance and high concentrations of O_2. Acid endopeptidase activity was strongly associated with thylakoid membranes. Treatment with H_2O_2 increased thylakoid-bound acid endopeptidase activity but had no effect on the solubilized activity. It is suggested that active species of oxygen generated in illuminated chloroplasts may enhance proteolysis by inducing alterations in membranes which, in turn, increase the endopeptidic activity.

• 日本植物生理学会の論文

著者

• Gomez L

  Inst. Fitopatologia Y Fisiolgia Vegetal Cordoba Arg

• Trippi Victorio

  Laboratorio de Fisiologia Vegetal, Facultad de Ciencias E., F. y N., Universidad Nacional de Cordoba

• Trippi Victorio

  Laboratorio De Fisiologia Vegetal (imbiv) Facultad De Ciencias Exactas Fisicas Y Naturales Universid

• Trippi Victorio

  Laboratorio De Fisiologfa Vegetal

• Casano L

  Departamento De Biologia Vegetal Universidad De Alcala De Henares

• Casano Leonardo

  Laboratorio De Fisiologia Vegetal (imbiv) Facultad De Ciencias Exactas Fisicas Y Naturales Universid

• Gomez Leonardo

  Laboratorio de Fisiologia Vegetal, Fac. de Clencias Exactas, Fisiocas y Naturales, Universidad Nacio

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• Oxygen-and Light-Induced Proteolysis in Isolated Oat Chloroplasts
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