symplocarpus/oxidase

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Thioredoxin o-mediated reduction of mitochondrial alternative oxidase in the thermogenic skunk cabbage Symplocarpus renifolius.

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Thermogenesis in plants involves significant increases in their cyanide-resistant mitochondrial alternative oxidase (AOX) capacity. Because AOX is a non-proton-motive ubiquinol oxidase, the dramatic drop in free energy between ubiquinol and oxygen is dissipated as heat. In the thermogenic skunk

Respiratory Chain of Plant Mitochondria: XVIII. Point of Interaction of the Alternate Oxidase with the Respiratory Chain.

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Oxidation of the respiratory chain carriers of anaerobic, CO-saturated skunk cabbage (Symplocarpus foetidus) mitochondria, by means of an O(2) pulse, proceeds primarily through the cyanide-insensitive alternate oxidase, since the oxidation of cytochromes a and a(3) takes place with a half-time of 3

Determination of molecular mass of the aroid alternative oxidase by radiation-inactivation analysis.

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The functional molecular mass of the cyanide-resistant salicylhydroxamate-sensitive duroquinol oxidase activity from Sympocarpus foetidus (skunk cabbage) and Sauromatum guttatum spadix mitochondria was determined by radiation-inactivation analysis. The functional molecular mass for the oxidase

Functional expression of plant alternative oxidase decreases antimycin A-induced reactive oxygen species production in human cells.

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Alternative oxidase (AOX) plays a pivotal role in cyanide-resistance respiration in the mitochondria of plants, fungi and some protists. Here we show that AOX from thermogenic skunk cabbage successfully conferred cyanide resistance to human cells. In galactose medium, HeLa cells with

Identification and partial purification of a stage-specific 33 kDa mitochondrial protein as the alternative oxidase of the Trypanosoma brucei brucei bloodstream trypomastigotes.

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The glycerophosphate oxidase (GPO), the unique terminal oxidase of bloodstream trypanosome (TAO), appears to be functionally similar to the alternative oxidases of some plants and higher fungi. Immunoblotting of mitochondrial proteins of bloodstream trypomastigotes of Trypanosoma brucei with

Functional coexpression of the mitochondrial alternative oxidase and uncoupling protein underlies thermoregulation in the thermogenic florets of skunk cabbage.

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Two distinct mitochondrial energy dissipating systems, alternative oxidase (AOX) and uncoupling protein (UCP), have been implicated as crucial components of thermogenesis in plants and animals, respectively. To further clarify the physiological roles of AOX and UCP during homeothermic heat

Partial purification of the cyanide-resistant alternative oxidase of skunk cabbage (Symplocarpus foetidus) mitochondria.

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A partial purification of the cyanide-resistant, alternative oxidase from skunk cabbage (Symplocarpus foetidus L.) spadix mitochondria is described. Skunk cabbage mitochondria were solubilized in N,N-bis-(3-D-glucon-amido-propyl)deoxycholamide and the alternative oxidase was purified using a batch

Metabolic interplay between cytosolic phosphoenolpyruvate carboxylase and mitochondrial alternative oxidase in thermogenic skunk cabbage, Symplocarpus renifolius.

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Skunk cabbage (Symplocarpus renifolius) blooms in early spring and its inflorescence, referred to as the spadix, can produce enough heat to melt snow. Here, we investigated glycolytic carbon flow at the PEP branch-point in thermogenic spadices. Our analyses revealed that petals and pistils in

The respiratory chain of plant mitochondria. I. Electron transport between succinate and oxygen in skunk cabbage mitochondria.

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The kinetics of oxidation of ubiquinone, flavoprotein, cytochrome c, and the cytochrome b complex in skunk cabbage (Symplocarpus foetidus) mitochondria made anaerobic with succinate have been measured spectrophotometrically and fluorimetrically in the absence of respiratory inhibitor and in the

The Respiratory Chain of Plant Mitochondria: VII. Kinetics of Flavoprotein Oxidation in Skunk Cabbage Mitochondria.

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The oxidation kinetics of the two high potential flavo-proteins, one (Fp(hf)) fluorescent and the other (Fp(ha)) nonfluorescent, in mitochondria from skunk cabbage (Symplocarpus foetidus) spadices have been measured by combined spectrophotometry and fluorimetry. In the absence of respiratory

The Respiratory Chain of Plant Mitochondria: XVII. Flavoprotein-Cytochrome b(562) Interaction in Antimycin-treated Skunk Cabbage Mitochondria.

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During the transition from the aerobic steady state with succinate as substrate to anaerobiosis, in suspensions of skunk cabbage (Symplocarpus foetidus) mitochondria treated with antimycin A, cytochrome b(562) becomes reoxidized to the extent of about 20%, synchronously with the reduction of

Cyanide-insensitive Respiration in Plant Mitochondria.

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Pathways of electron transport have been studied in mitochondria isolated from hypocotyls of etiolated mung bean seedlings and skunk cabbage spadices that show cyanide-resistant respiratory activity. The residual flux through cytochrome c oxidase is shown to be small in comparison with the flux

The respiratory chain of plant mitochondria. IV. Oxidation rates of the respiratory carriers of mung bean mitochondria in the presence of cyanide.

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The half-time for oxidation of cytochrome b(557) in mitochondria from etiolated mung bean (Phaseolus aureus) hypocotyls is 5.8 milliseconds at 24 Celsius in the absence or presence of 0.3 mm KCN, when the oxidation is carried out by injecting a small amount of oxygenated medium into a suspension of

Pyruvate-sensitive AOX exists as a non-covalently associated dimer in the homeothermic spadix of the skunk cabbage, Symplocarpus renifolius.

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The cyanide-resistant alternative oxidase (AOX) is a homodimeric protein whose activity can be regulated by the oxidation/reduction state and by alpha-keto acids. To further clarify the role of AOX in the skunk cabbage, Symplocarpus renifolius, we have performed expression and functional analyses of

The respiratory chain of plant mitochondria. II. Oxidative phosphorylation in skunk cabbage mitochondria.

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Mitochondria were prepared from the spadices of skunk cabbage (Symplocarpus foetidus) whose respiratory rate with succinate and malate showed 15% to 30% sensitivity to cyanide inhibition, and which showed respiratory control by added ADP. The observed respiratory control ratios ranged from 1.1 to

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