cytochrome c/tobak

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Cytochrome c is released in a reactive oxygen species-dependent manner and is degraded via caspase-like proteases in tobacco Bright-Yellow 2 cells en route to heat shock-induced cell death.

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To gain some insight into the mechanism of plant programmed cell death, certain features of cytochrome c (cyt c) release were investigated in heat-shocked tobacco (Nicotiana tabacum) Bright-Yellow 2 cells in the 2- to 6-h time range. We found that 2 h after heat shock, cyt c is released from intact

Melatonin Protects Cultured Tobacco Cells against Lead-Induced Cell Death via Inhibition of Cytochrome c Translocation.

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Melatonin was discovered in plants more than two decades ago and, especially in the last decade, it has captured the interests of plant biologists. Beyond its possible participation in photoperiod processes and its role as a direct free radical scavenger as well as an indirect antioxidant, melatonin

Mitochondrial complex I impairment and differential carbon monoxide sensitivity of cytochrome c oxidase in wild type and CMS II mutants of Nicotiana sylvestris.

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Plant mitochondria unlike their animal counterpart have some unique features with highly branched respiratory chain. The present work was undertaken in order to investigate the effect of loss/dysfunction of plant mitochondrial complex I on the relative flux of electrons through alternative oxidase

CCS2, an Octatricopeptide-Repeat Protein, Is Required for Plastid Cytochrome c Assembly in the Green Alga Chlamydomonas reinhardtii.

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In bacteria and energy generating organelles, c-type cytochromes are a class of universal electron carriers with a heme cofactor covalently linked via one or two thioether bonds to a heme binding site. The covalent attachment of heme to apocytochromes is a catalyzed process, taking place via three

Ozone-induced cell death in tobacco cultivar Bel W3 plants. The role of programmed cell death in lesion formation.

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Treatment of the ozone-sensitive tobacco (Nicotiana tabacum L. cv Bel W3) with an ozone pulse (150 nL L(-1) for 5 h) induced visible injury, which manifested 48 to 72 h from onset of ozone fumigation. The "classical" ozone symptoms in tobacco cv Bel W3 plants occur as sharply defined, dot-like

Subcellular localization and topology of homogalacturonan methyltransferase in suspension-cultured Nicotiana tabacum cells.

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Pectin is a complex polysaccharide in the primary walls of all plant cells that is thought to be synthesized in the cellular endomembrane system and inserted into the wall via exocytosis. The most abundant pectic polysaccharide, homogalacturonan, is partially methylesterified within the cell by the

Investigations of vacuoles isolated from tobacco: I. Quantitation of nicotine.

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Nicotine was shown to be associated with mature vacuoles isolated from protoplasts of Nicotiana rustica. The vacuolar preparations also contained high levels of acid phosphatase, ATPase, and approximately 30% of the soluble protoplastic protein. The contamination of the vacuolar isolate by

Short-term salinity stress in tobacco plants leads to the onset of animal-like PCD hallmarks in planta in contrast to long-term stress.

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Recent results have identified mitochondria as centers of stress-induced generation of reactive oxygen species in plants. Depolarization of plant mitochondrial membrane during stress results the release of programmed cell death (PCD)-inducing factors in the cytosol in a fashion similar to the onset

Salicylic Acid induces cyanide-resistant respiration in tobacco cell-suspension cultures.

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Cyanide-resistant, alternative respiration in Nicotiana tabacum L. cv Xanthi-nc was analyzed in liquid suspension cultures using O(2) uptake and calorimetric measurements. In young cultures (4-8 d after transfer), cyanide inhibited O(2) uptake by up to 40% as compared to controls. Application of 20

Purification and immunochemical characteristics of NADPH-cytochrome P-450 oxidoreductase from tobacco cultured cells.

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NADPH-cytochrome P-450 oxidoreductase (EC 1.6.2.4) was purified from the microsomal fraction of tobacco (Nicotiana tabacum) BY2 cells by chromatography on two anion-exchange columns and 2',5' ADP-Sepharose 4B column. The purified enzyme showed a single protein band with a molecular weight of 79 kDa

Characteristics of Nicotiana tabacum nitrate reductase protein produced in Saccharomyces cerevisiae.

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Tobacco nitrate reductase (NR) produced in yeast retains cytochrome c reductase activity, but not NR activity. Biochemical data suggest that the haem and FAD domains are functional, and that the molybdenum cofactor (MoCo) domain is inactive owing to the absence of MoCo in yeast. The native form of

Transgenic plant cells lacking mitochondrial alternative oxidase have increased susceptibility to mitochondria-dependent and -independent pathways of programmed cell death.

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The plant mitochondrial electron transport chain is branched such that electrons at ubiquinol can be diverted to oxygen via the alternative oxidase (AOX). This pathway does not contribute to ATP synthesis but can dampen the mitochondrial generation of reactive oxygen species. Here, we establish that

Bromphenol blue: nitrate reductase activity in Nicotiana plumbaginifolia: an immunochemical and genetic approach.

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NADH: nitrate reductase (EC 1.6.6.1) was purified from Nicotiana plumbaginifolia leaves. As recently observed with nitrate reductase from other sources, this enzyme is able to reduce nitrate using reduced bromphenol blue (rBPB) as the electron donor. In contrast to the physiological NADH-dependent

Biochemical and Immunological Characterization of Nitrate Reductase Deficient nia Mutants of Nicotiana plumbaginifolia.

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Sixty-five Nicotiana plumbaginifolia mutants affected in the nitrate reductase structural gene (nia mutants) have been analyzed and classified. The properties evaluated were: (a) enzyme-linked immunosorbent assay (two-site ELISA) using a monoclonal antibody as coating reagent and (b) presence of

Isolation and partial characterization of vacuoles from tobacco protoplasts.

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Protoplasts from suspension-cultured cells of Nicotiana glutinosa L. were lysed in 0.3 molar sorbitol in 2 millimolar ethylenediaminetetraacetate-tris(hydroxymethyl) aminomethane (pH 7.5) to release intact vacuoles. The vacuoles were purified by centrifugation in a Ficoll step gradient. About 11% of

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