Roles for metal ions in the hydrolysis of adenosine triphosphate by the 13S coupling factors of bacterial and mitochondrial oxidative phosphorylation

Biochemistry ◽  
1973 ◽  
Vol 12 (15) ◽  
pp. 2926-2933 ◽  
Author(s):  
Robert Adolfsen ◽  
Evangelos N. Moudrianakis
Keyword(s):  
Oxidative Phosphorylation ◽  
Metal Ions ◽  
Adenosine Triphosphate ◽  
Mitochondrial Oxidative Phosphorylation ◽  
Coupling Factors ◽  
Hydrolysis Of

Dependence of Platelet Adenyl Cyclase System on Oxidative Phosphorylation

1975 ◽  
Vol 34 (01) ◽  
pp. 042-049 ◽  
Author(s):  
Shuichi Hashimoto ◽  
Sachiko Shibata ◽  
Bokro Kobayashi
Keyword(s):  
Cyclic Amp ◽  
Oxidative Phosphorylation ◽  
Sodium Succinate ◽  
Potassium Cyanide ◽  
Adenyl Cyclase ◽  
Mitochondrial Oxidative Phosphorylation ◽  
Adenyl Cyclase Activity ◽  
Intact Rabbit ◽  
Adenyl Cyclase System ◽  
Cyclic Amp Synthesis

SummaryThe radioactive adenosine 3′,5′-monophosphate (cyclic AMP) level derived from 8-14C adenine in intact rabbit platelets decreased in the presence of mitochondrial inhibitor (potassium cyanide) or uncoupler (sodium azide), and markedly increased by the addition of NaF, monoiodoacetic acid (MIA), or 2-deoxy-D-glucose. The stimulative effect of the glycolytic inhibitors was distinctly enhanced by the simultaneous addition of sodium succinate. MIA did neither directly stimulate the adenyl cyclase activity nor inhibit the phosphodiesterase activity. These results suggest that cyclic AMP synthesis in platelets is closely linked to mitochondrial oxidative phosphorylation.

Impairment of mitochondrial oxidative phosphorylation in skin fibroblasts of SALS and FALS patients is rescued by in vitro treatment with ROS scavengers

2021 ◽  
Vol 339 ◽  
pp. 113620
Author(s):  
Grazyna Debska-Vielhaber ◽  
Irina Miller ◽  
Viktoriya Peeva ◽  
Werner Zuschratter ◽  
Jaroslaw Walczak ◽  
...  
Keyword(s):  
Oxidative Phosphorylation ◽  
Skin Fibroblasts ◽  
Mitochondrial Oxidative Phosphorylation ◽  
Ros Scavengers ◽  
In Vitro Treatment

scholarly journals Nanoscopic quantification of sub-mitochondrial morphology, mitophagy and mitochondrial dynamics in living cells derived from patients with mitochondrial diseases

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Weiwei Zou ◽  
Qixin Chen ◽  
Jesse Slone ◽  
Li Yang ◽  
Xiaoting Lou ◽  
...  
Keyword(s):  
Oxidative Phosphorylation ◽  
Optic Atrophy ◽  
Respiratory Function ◽  
Clinical Symptoms ◽  
Mitochondrial Dynamics ◽  
Cerebellar Atrophy ◽  
Mitochondrial Diseases ◽  
Living Cells ◽  
Mitochondrial Morphology ◽  
Mitochondrial Oxidative Phosphorylation

AbstractSLC25A46 mutations have been found to lead to mitochondrial hyper-fusion and reduced mitochondrial respiratory function, which results in optic atrophy, cerebellar atrophy, and other clinical symptoms of mitochondrial disease. However, it is generally believed that mitochondrial fusion is attributable to increased mitochondrial oxidative phosphorylation (OXPHOS), which is inconsistent with the decreased OXPHOS of highly-fused mitochondria observed in previous studies. In this paper, we have used the live-cell nanoscope to observe and quantify the structure of mitochondrial cristae, and the behavior of mitochondria and lysosomes in patient-derived SLC25A46 mutant fibroblasts. The results show that the cristae have been markedly damaged in the mutant fibroblasts, but there is no corresponding increase in mitophagy. This study suggests that severely damaged mitochondrial cristae might be the predominant cause of reduced OXPHOS in SLC25A46 mutant fibroblasts. This study demonstrates the utility of nanoscope-based imaging for realizing the sub-mitochondrial morphology, mitophagy and mitochondrial dynamics in living cells, which may be particularly valuable for the quick evaluation of pathogenesis of mitochondrial morphological abnormalities.

scholarly journals Molecular and Supramolecular Structure of the Mitochondrial Oxidative Phosphorylation System: Implications for Pathology

Life ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 242
Author(s):  
Salvatore Nesci ◽  
Fabiana Trombetti ◽  
Alessandra Pagliarani ◽  
Vittoria Ventrella ◽  
Cristina Algieri ◽  
...  
Keyword(s):  
Oxidative Phosphorylation ◽  
Atp Synthase ◽  
Mitochondrial Permeability Transition ◽  
Ros Generation ◽  
Protonmotive Force ◽  
Mitochondrial Oxidative Phosphorylation ◽  
F1fo Atp Synthase ◽  
Functional Changes ◽  
Age Related ◽  
Mitochondrial Functions

Under aerobic conditions, mitochondrial oxidative phosphorylation (OXPHOS) converts the energy released by nutrient oxidation into ATP, the currency of living organisms. The whole biochemical machinery is hosted by the inner mitochondrial membrane (mtIM) where the protonmotive force built by respiratory complexes, dynamically assembled as super-complexes, allows the F1FO-ATP synthase to make ATP from ADP + Pi. Recently mitochondria emerged not only as cell powerhouses, but also as signaling hubs by way of reactive oxygen species (ROS) production. However, when ROS removal systems and/or OXPHOS constituents are defective, the physiological ROS generation can cause ROS imbalance and oxidative stress, which in turn damages cell components. Moreover, the morphology of mitochondria rules cell fate and the formation of the mitochondrial permeability transition pore in the mtIM, which, most likely with the F1FO-ATP synthase contribution, permeabilizes mitochondria and leads to cell death. As the multiple mitochondrial functions are mutually interconnected, changes in protein composition by mutations or in supercomplex assembly and/or in membrane structures often generate a dysfunctional cascade and lead to life-incompatible diseases or severe syndromes. The known structural/functional changes in mitochondrial proteins and structures, which impact mitochondrial bioenergetics because of an impaired or defective energy transduction system, here reviewed, constitute the main biochemical damage in a variety of genetic and age-related diseases.

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