The modulation in subunits e and g amounts of yeast ATP synthase modifies mitochondrial cristae morphology.
Subunits e and g of Saccharomyces cerevisiae ATP synthase are required to maintain ATP synthase dimeric forms. Mutants devoid of these subunits display anomalous mitochondrial morphologies. An expression system regulated by doxycycline was used to modulate the expression of the genes encoding the subunits e and g. A decrease in the amount of subunit e induces a decrease in the amount of subunit g, but a decrease in the amount of subunit g does not affect subunit e. The loss of subunit e or g leads to the loss of supramolecular structures of ATP synthase, which is fully reversible upon removal of doxycycline. In the absence of doxycycline, mitochondria present poorly defined cristae. In the presence of doxycycline, onion-like structures are formed after five generations. When doxycycline is removed after five generations, cristae are mainly observed. The data demonstrate that the inner structure of mitochondria depends upon the ability of ATP synthase to make supramolecular structures.
Arselin
Geneviève
G
Institut de Biochimie et Génétique Cellulaires du CNRS, Université Victor Segalen, Bordeaux 2, 1, rue Camille Saint Saëns, 33077 Bordeaux Cedex, France.
Vaillier
Jacques
J
Salin
Bénédicte
B
Schaeffer
Jacques
J
Giraud
Marie-France
MF
Dautant
Alain
A
Brèthes
Daniel
D
Velours
Jean
J
D000255:Adenosine Triphosphate / Q000737:chemistry; D015153:Blotting, Western; D002455:Cell Division; D003470:Culture Media / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004318:Doxycycline / Q000494:pharmacology; D007425:Intracellular Membranes / Q000378:metabolism; D008928:Mitochondria / Q000378:metabolism* / Q000648:ultrastructure; D025261:Mitochondrial Proton-Translocating ATPases / Q000737:chemistry* / Q000378:metabolism; D009154:Mutation; D010641:Phenotype; D010957:Plasmids / Q000378:metabolism; D017434:Protein Structure, Tertiary; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000648:ultrastructure; D013997:Time Factors
D003470:Culture Media; D000255:Adenosine Triphosphate; D025261:Mitochondrial Proton-Translocating ATPases; D004318:Doxycycline