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Electron transport in purified glyoxysomal membranes from castor-bean endosperm

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Abstract

Glyoxysomes isolated from castor-bean (Ricinus communis L.) endosperm were treated with water, 0.2 M KCl, 1 M KCl, or 0.1 M Na2CO3. Glyoxysomal sacs, i.e. membranes which retained some visible matrix, resulted from the treatments with water and KCl. Glyoxysomal ghosts, i.e. intact membranes free of matrix, were only obtained following treatment with carbonate. The ghosts were free of activities of matrix enzymes, particularly palmitoyl-CoA oxidation, isocitrate dehydrogenase (EC 1.1.1.42) and isocitrate lyase (EC 4.1.3.1), and contained only negligible amounts of malate synthase (EC 4.1.3.2), malate dehydrogenase (EC 1.1.1.37), β-hydroxyacyl-CoA dehydrogenase (EC 1.1.1.98) and catalase (EC 1.11.1.6). Distribution and appearance of membrane-associated particles in the protoplasmic and ectoplasmic faces of freeze-fracture replicas of the glyoxysomal membrane were the same in intact tissue, isolated glyoxysomes, and ghosts. Membranes purified by treatment with 0.2 M KCl or 0.1 M carbonate catalyzed the reduction of cytochrome-c when NADH or NADPH was provided as the electron donor. β-Oxidation, localized in the matrix, could be linked to reduction of cytochrome-c or ferricyanide when purified membranes were combined with the matrix supernatant. Cytochrome-c could also be reduced by coupling enzyme activities in the matrix, NADP-isocitrate dehydrogenase or malate dehydrogenase, with those of the membrane. These results indicate that electrons from β-oxidation, malate oxidation or isocitrate oxidation can be transferred directly to the redox components of the glyoxysomal membrane. We, therefore, conclude that any NADH and NADPH formed by enzymes in the matrix can be recycled continuously within the organelle.

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Abbreviations

EF:

ectoplasmic face

ER:

endoplasmic reticulum

PF:

protoplasmic face

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Fang, T.K., Donaldson, R.P. & Vigil, E.L. Electron transport in purified glyoxysomal membranes from castor-bean endosperm. Planta 172, 1–13 (1987). https://doi.org/10.1007/BF00403023

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