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Inhibition of Chlororespiration by Myxothiazol and Antimycin A in Chlamydomonas Reinhardtii

Inhibition of Chlororespiration by Myxothiazol and Antimycin A in Chlamydomonas Reinhardtii

J Ravenel, G Peltier

Photosynth Res. 1991 Jun;28(3):141-8.

PMID: 24414973

Abstract:

Myxothiazol and antimycin A are shown to suppress the oxygen transient previously attributed to the flash-induced inhibition of chlororespiration in Chlamydomonas reinhardtii (Peltier et al. 1987, Biochim Biophys Acta 893: 83-90). However, these two compounds do not affect the photosynthetic electron transport chain as inferred by the insensitivity of the CO2-dependent photosynthetic O2 evolution and of the flash-induced electrochromic effect. Chlorophyll fluorescence induction measurements carried out in dark-adapted cells of a mutant of Chlamydomonas lacking photosystem 1, show that myxothiazol and antimycin A significantly increase the redox state of the photosystem 2 acceptors. We conclude from these results that chlororespiration is inhibited by myxothiazol and antimycin A and that the site of inhibition is located on the dark oxidation pathway of the plastoquinone pool. This inhibition is interpreted through the involvement of a myxothiazol and antimycin A sensitive cytochrome in the chlororespiratory chain.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP76706553	Myxothiazol		76706-55-3	Price

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