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Nature of the phytochrome effect on the binding of glycolate oxidase to peroxisomes in vitro

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Abstract

The attachment of glycolate oxidase to the peroxisomal fraction derived from etiolated barley leaves (Hordeum vulgare L. cr. Dvir) is affected by light. The effect of red irradiation is reversed by subsequent far-red irradiation, indicating the involvement of phytochrome. This phytochrome effect is assumed to be related to phytochrome binding. Indeed, prevention by filipin (1.2·10-6 mol g-1 f wt) or cholesterol of phytochrome binding to membranes abolishes the effect of light on the interaction between glycolate oxidase and the peroxisomal fraction. Glycolate oxidase binding is affected by addition of quasi-ionophores such as gramicidin and filipin at a concentration of 0.6·10-3 mol g-1 f wt. This fact indicates that peroxisome-glycolate oxidase interaction may be affected by membrane potential. Since both ion transport and membrane potential are known to be affected by phytochrome, it is proposed that phytochrome acts in the light-induced modulation of glycolate oxidase attachment as a quasi-ionophore.

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Abbreviations

GO:

glycolate oxidase

Pr and Pfr:

phytochrome forms absorbing in red and far-red, respectively

R and F:

red and far-red irradiation

Cumulative 20 Kp:

20,000 g pellet obtained by centrifugation of the crude extract

1 Kp:

1,000 g pellet

20 Kp:

20,000 g pellet, obtained by centrifugation of 1 Kp supernatant

1 Kp′, 20 Kp′ and cumulative 20 Kp′:

pellets obtained after density centrifugation through a sucrose cushion

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Roth-Bejerano, N. Nature of the phytochrome effect on the binding of glycolate oxidase to peroxisomes in vitro. Planta 149, 252–256 (1980). https://doi.org/10.1007/BF00384561

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