title: Protonmotive force in giant mitochondria.
abstract: The accompanying communication [Eur. J. Biochem. 141 (1984) 1-4] indicates that the microinjection of the pH fluorescent indicator pyranine (8-hydroxy-1,2,6- pyrenesulfonate ) into giant mitochondria or mitoplasts does not affect their ability to carry out oxidative phosphorylation. The dye can therefore be used as a quantitative indicator of internal mitochondrial pH. We found that activation of metabolism in rotenone-inhibited giant mitochondria by the addition of succinate produces an internal pH change corresponding to a pH shift of 0.3 to the alkaline range, approximately the same value found previously for conventional rat liver mitochondria.
mesh_terms: D000818:Animals; D001190:Arylsulfonates; D005456:Fluorescent Dyes; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D051379:Mice; D008930:Mitochondria, Liver / Q000378:metabolism*; D010085:Oxidative Phosphorylation; D011522:Protons; D013050:Spectrometry, Fluorescence
chemical_list: D001190:Arylsulfonates; D005456:Fluorescent Dyes; D011522:Protons; C005047:pyranine