Electron Transfer and Oxidative Phosphorylation in Plant Mitochondria

Douce, Roland; Brouquisse, Renaud; Journet, Étienne-Pascal

doi:10.1016/b978-0-12-675411-7.50012-4

Cited by 6 publications

(6 citation statements)

References 183 publications

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“…During heat stress conditions, complex I breaks down to a lower molecular mass form of about 350 kDa and exhibits lower NADH:ubiquinone oxidoreductase activity rates [1, 5]. At heat stress temperatures, components of oxidative phosphorylation other than complex I often exhibit increased rates of activity [1, 9–11], but oxidative phosphorylation as a whole shows deceased rates of activity, indicating that complex I may be the limiting element of oxidative phosphorylation during heat stress [11]. Adaptations that protect complex I from heat stress are largely unknown.…”

Section: Introductionmentioning

confidence: 99%

The mitochondrial small heat‐shock protein protects NADH:ubiquinone oxidoreductase of the electron transport chain during heat stress in plants

1998

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Functional inactivation of the mitochondrial small heat-shock protein (lmw Hsp) in submitochondrial vesicles using protein-specific antibodies indicated that this protein protects NADH :ubiquinone oxidoreductase (complex I), and consequently electron transport from complex I to cytochrome c:O P oxidoreductase (complex IV). Lmw Hsp function completely accounted for heat acclimation of complex I electron transport in pre-heat-stressed plants. Addition of purified lmw Hsp to submitochondrial vesicles lacking this Hsp increased complex I electron transport rates 100% in submitochondrial vesicles assayed at high temperatures. These results indicate that production of the mitochondrial lmw Hsp is an important adaptation to heat stress in plants.z 1998 Federation of European Biochemical Societies.

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Section: Introductionmentioning

confidence: 99%

The mitochondrial small heat‐shock protein protects NADH:ubiquinone oxidoreductase of the electron transport chain during heat stress in plants

1998

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“…It has also been reported that Chlorella pyrenoidosa contains two terminal oxidases, the Cyt c oxidase with Km (02) of 2.1 zM, and a second oxidase with Km (02) of 6.7 gM (17). Cyanide-insensitive or alternative respiration in mitochondria of plants (3,4,6,7,13,15,19,20), as well as fungi such as Neurospora (14) and yeast (5), has been reviewed extensively.…”

Section: Algal Strain and Culture Conditionsmentioning

confidence: 99%

Variations in the Alternative Oxidase in Chlamydomonas Grown in Air or High CO₂

Goyal

Tolbert²

1989

Plant Physiol.

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Chiamydomonas in the resting phase of growth has an equal capacity of about 15 micromole 02 uptake per hour per milligram of chlorophyll for both the cytochrome c, CN-sensitive respiration, and for the altemative, salicylhydroxamic acid-sensitive respiration. Altemative respiration capacity was measured as salicylhydroxamic acid inhibited 02 uptake in the presence of CN, and cytochrome c respiration capacity as CN inhibition of 02 uptake in the presence of salicylhydroxamic acid. Measured total respiration was considerably less than the combined capacities for respiration. During the log phase of growth on high (2-5%) C02, the altemative respiration capacity decreased about 90% but retumed as the culture entered the lag phase. When the altemative oxidase capacity was low, addition of salicylic acid or cyanide induced its reappearance. When cells were grown on low (airlevel) C02, which induced a CO2 concentrating mechanism, the altemative oxidase capacity did not decrease during the growth phase. Attempts to measure in vivo distribution of respiration between the two pathways with either CN or salicylhydroxamic acid alone were inconclusive. is activated. In unicellular algae, such as Chlamydomonas, Dunaliella, Chlorella, and Euglena, the oxidation ofglycolate formed during photosynthesis is catalyzed by a mitochondrial membrane bound glycolate dehydrogenase which also oxidizes i-lactate (24). This dehydrogenase does not transfer electrons directly to oxygen as does the FMN-linked, peroxisomal glycolate oxidase. By using a cytochrome oxidasedeficient mutant of Chlamydomonas reinhardtii, Husic andTolbert (1 1) showed that glycolate and D-lactate metabolism could proceed through a SHAM-sensitive, alternative, electron transport pathway. These considerations raised the question whether there might be a difference in the cyanidesensitive (Cyt c) and cyanide-insensitive (alternative) respiration by C. reinhardtii during their growth cycle in low C02 (air) or high C02.

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“…. Schematic diagram of the components of the higher plant respiratory chain [from Douce et al (1987), modified and used with permission from authors and publisher]. of defense and repair mechanisms to provide adequate protection, or (3) a combination of both processes.…”

mentioning

confidence: 99%

“…The plant mitochondrial respiratory chain con-sists of four closely associated electron carrier protein complexes located in the mitochondrial inner membrane ( Fig. 1 adapted from Douce et al 1987). The dehydrogenase complexes in the mitochondrial inner membrane reduce a common pool of the membrane iipid, ubiquinone.…”

mentioning

confidence: 99%

Does the alternative pathway ameliorate chilling injury in sensitive plant tissues?

Purvis¹,

Shewfelt²

1993

Physiol Plant

125

161

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Does the alternative pathway amehorate chilling injury in sensitive plant tissues? -Physiol. Plant. 88: 712-718.Free radical processes have been observed in senescence and several membraneassociated disorders of plants including chilling, freezing, and desiccation injuries. The mitochondria ot plant tissues exposed to low temperatures, and other abiotic and biotic stresses, produce superoxide and/or hydrogen peroxide when electron transport through the cytochrome pathway is impaired due to the energy state of the cell or to stress-induced physical changes in the membrane components. The superoxide and/or hydrogen peroxide produced can diffuse throughout the cell causing peroxidation of membrane lipids which results in membrane disruption, increased permeability and metabolic disturbances, and eventually the visible symptoms of chilling injury. The alternative pathway of electron transport in the mitochondria, which is induced by low temperatures in some plant tissues, can mediate these degradative processes by reducing the level of superoxide generated by the mitochondria.

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Electron Transfer and Oxidative Phosphorylation in Plant Mitochondria

Cited by 6 publications

References 183 publications

The mitochondrial small heat‐shock protein protects NADH:ubiquinone oxidoreductase of the electron transport chain during heat stress in plants

The mitochondrial small heat‐shock protein protects NADH:ubiquinone oxidoreductase of the electron transport chain during heat stress in plants

Variations in the Alternative Oxidase in Chlamydomonas Grown in Air or High CO₂

Does the alternative pathway ameliorate chilling injury in sensitive plant tissues?

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Electron Transfer and Oxidative Phosphorylation in Plant Mitochondria

Cited by 6 publications

References 183 publications

The mitochondrial small heat‐shock protein protects NADH:ubiquinone oxidoreductase of the electron transport chain during heat stress in plants

The mitochondrial small heat‐shock protein protects NADH:ubiquinone oxidoreductase of the electron transport chain during heat stress in plants

Variations in the Alternative Oxidase in Chlamydomonas Grown in Air or High CO2

Does the alternative pathway ameliorate chilling injury in sensitive plant tissues?

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Variations in the Alternative Oxidase in Chlamydomonas Grown in Air or High CO₂