Lapaillet 2010 Bioch Biophys Acta

Lapaille M, Thiry M, Perez E, Gonzalez Halphen D, Remacle C, Cardol P (2010) Loss of mitochondrial ATP synthase subunit beta (Atp2) alters mitochondrial and chloroplastic function and morphology in Chlamydomonas. Bioch Biophys Acta 1797:1533-9.

» PMID:20416275

Lapaillet Marie, Thiry Marc, Perez Emilie, Gonzalez Halphen Diego, Remacle Claire, Cardol Pierre (2010) Bioch Biophys Acta

Abstract: Mitochondrial F1FO ATP synthase (Complex V) catalyses ATP synthesis from ADP and inorganic phosphate using the proton-motive force generated by the substrate-driven electron transfer chain. In this work, we investigated the impact of the loss of activity of the mitochondrial enzyme in a photosynthetic organism. In this purpose, we inactivated by RNA interference the expression of the ATP2 gene, coding for the catalytic subunit beta, in the green alga Chlamydomonas reinhardtii. We demonstrate that in the absence of beta subunit, complex V is not assembled, respiratory rate is decreased by half and ATP synthesis coupled to the respiratory activity is fully impaired. Lack of ATP synthase also affects the morphology of mitochondria which are deprived of cristae. We also show that mutants are obligate phototrophs and that rearrangements of the photosynthetic apparatus occur in the chloroplast as a response to ATP synthase deficiency in mitochondria. Altogether, our results contribute to the understanding of the yet poorly studied bioenergetic interactions between organelles in photosynthetic organisms.

Labels: MiParea: Respiration 

Algae, Dark respiration, Photosynthesis