Mitochondrial glycerol phosphate oxidation is modulated by adenylates through allosteric regulation of cytochrome c oxidase activity in mosquito flight muscle
| Autor: | Marcus F. Oliveira, A. Gaviraghi, Juliana B. R. Correa Soares, Carlos Frederico Leite Fontes, Julio A. Mignaco |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Bioenergetics Cell Respiration Allosteric regulation Adenylate kinase Oxidative phosphorylation Biology 01 natural sciences Biochemistry Electron Transport Complex IV chemistry.chemical_compound 03 medical and health sciences Allosteric Regulation Myofibrils Oxidoreductase Aedes Animals Cytochrome c oxidase Molecular Biology 030304 developmental biology chemistry.chemical_classification 0303 health sciences Metabolism Electron transport chain Mitochondria 010602 entomology chemistry Glycerophosphates Insect Science biology.protein Female Glycerol 3-phosphate Energy source Oxidation-Reduction |
| Zdroj: | Insect Biochemistry and Molecular Biology. 114:103226 |
| ISSN: | 0965-1748 |
| DOI: | 10.1016/j.ibmb.2019.103226 |
| Popis: | The huge energy demand posed by insect flight activity is met by an efficient oxidative phosphorylation process that takes place within flight muscle mitochondria. In the major arbovirus vectorAedes aegypti, mitochondrial oxidation of pyruvate, proline and glycerol 3 phosphate (G3P) represent the major energy sources of ATP to sustain flight muscle energy demand. Although adenylates exert critical regulatory effects on several mitochondrial enzyme activities, the potential consequences of altered adenylate levels to G3P oxidation remains to be determined. Here, we report that mitochondrial G3P oxidation is controlled by adenylates through allosteric regulation of cytochrome c oxidase (COX) activity inA. aegyptiflight muscle. We observed that ADP significantly activated respiratory rates linked to G3P oxidation, in a protonmotive force-independent manner. Kinetic analyses revealed that ADP activates respiration through a slightly cooperative mechanism. Despite adenylates caused no effects on G3P-cytochromecoxidoreductase activity, COX activity was allosterically activated by ADP. Conversely, ATP exerted powerful inhibitory effects on respiratory rates linked to G3P oxidation and on COX activity. We also observed that high energy phosphate recycling mechanisms did not contribute to the regulatory effects of adenylates on COX activity or G3P oxidation. We conclude that mitochondrial G3P oxidation byA. aegyptiflight muscle is regulated by adenylates essentially through the allosteric modulation of COX activity, underscoring the bioenergetic relevance of this novel mechanism and the potential consequences for mosquito dispersal. |
| Databáze: | OpenAIRE |
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