Reference : Loss of mitochondrial ATP synthase subunit beta (Atp2) alters mitochondrial and chlor...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
http://hdl.handle.net/2268/35939
Loss of mitochondrial ATP synthase subunit beta (Atp2) alters mitochondrial and chloroplastic function and morphology in Chlamydomonas.
English
Lapaille, M. [> > > >]
Thiry, Marc mailto [Université de Liège - ULg > Département des sciences de la vie > Biologie cellulaire >]
Perez, E. [> > > >]
Gonzalez-Halphen, D. [> > > >]
Remacle, Claire mailto [Université de Liège - ULg > Département des sciences de la vie > Génétique >]
Cardol, Pierre mailto [Université de Liège - ULg > Département des sciences de la vie > Génétique >]
2010
Biochimica et Biophysica Acta-Bioenergetics
Elsevier Science
1797
1533-1539
Yes (verified by ORBi)
International
0005-2728
Amsterdam
[en] Mitochondrial F(1)F(O) 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.
http://hdl.handle.net/2268/35939
10.1016/j.bbabio.2010.04.013
Copyright (c) 2010. Published by Elsevier B.V.

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