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Light Activation of Purified Aconitase by Washed Thylakoid Membranes of Pea (Pisum sativum L.) ¹

Department of Biological Sciences, University of Illinois at Chicago, Box 4348, Chicago, IL 60680

Purified aconitase, an iron-sulfur protein, from either beef heart mitochondria or pig heart can be activated fully by light when combined with washed thylakoid membranes from pea (Pisum sativum L.) chloroplasts. The light activation of the enzyme does not require any other additive or cofactor and is sensitive to 3-(3,4-dichlorophenyl)-1,1-dimethyl urea, 2,6-dichlorophenol-indophenol, ferricyanide, and methyl viologen, indicating that the photoelectron transport system of the thylakoid membranes, and in particular, photosystem I, is involved in the process of activation. Light activation of the enzyme is also markedly inhibited when the thylakoid membranes are treated with sulfite or arsenite, and abolished totally when the membranes are treated with Zwittergent, suggesting that the light effect mediator involved in the light modulation of chloroplastic enzymes mediates the activation of purified aconitase also.

¹ Supported by National Science Foundation Grant PCM 8005618 and Department of Energy Contract 78-S-02.