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Nitrate Reductases from Wild-Type and nr(1)-Mutant Soybean (Glycine max [L.] Merr.) Leaves : II. Partial Activity, Inhibitor, and Complementation Analyses.

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Soybean (Glycine max [L.] Merr.) leaves have been shown to contain three forms of nitrate reductase (NR). Two of the forms, which are present in leaves of wild-type (cv. Williams) plants grown in the absence of NO(3) (-), are termed constitutive and designated c(1)NR and c(2)NR. The third form,

Copper metallochaperones are required for the assembly of bacteroid cytochrome c oxidase which is functioning for nitrogen fixation in soybean nodules.

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Bradyrhizobium japonicum, a symbiotic nitrogen-fixing bacterium for Glycine max, has complex respiratory electron transport chains. Bll4880 contained a copper-binding motif for metallochaperone, H(M)X(10)MX(21)HXM. A mutant strain, Bj4880, induced nodules with lower acetylene reduction activity. A

Triterpenoids from Glycine max decrease invasiveness and induce caspase-mediated cell death in human SNB19 glioma cells.

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In recent years there has been an increasing interest in compounds present in foods that may prevent or slow the progression of chronic illnesses, such as cardiovascular disease, osteoporosis and cancer. Saponins have been reported to have important time-dependent anti-cancer properties. We have

Key within-membrane residues and precursor dosage impact the allotopic expression of yeast subunit II of cytochrome c oxidase.

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Experimentally relocating mitochondrial genes to the nucleus for functional expression (allotopic expression) is a challenging process. The high hydrophobicity of mitochondria-encoded proteins seems to be one of the main factors preventing this allotopic expression. We focused on subunit II of

Effects of exogenous bisphenol A on the function of mitochondria in root cells of soybean (Glycine max L.) seedlings.

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Bisphenol A (BPA), a contaminant of emerging concern, can affect plant root growth by changing various physiological processes. Mitochondria are critical organelles that produce energy for growth. However, how BPA affects the function and ultrastructure of mitochondria and then plant root growth

Arginine degradation by arginase in mitochondria of soybean seedling cotyledons.

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Arginase (EC 3.5.3.1) localization was studied in soybean (Glycine max L.) seedling cotyledons. Subcellular fractionation in a discontinuous Percoll gradient showed that arginase was localized in the mitochondrion. Arginine (Arg) uptake by mitochondria was demonstrated by co-sedimentation of

Direct Inhibition of Plant Mitochondrial Respiration by Elevated CO2.

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Doubling the concentration of atmospheric CO2 often inhibits plant respiration, but the mechanistic basis of this effect is unknown. We investigated the direct effects of increasing the concentration of CO2 by 360 [mu]L L-1 above ambient on O2 uptake in isolated mitochondria from soybean (Glycine

Phytoalexin synthesis in soybean: purification and reconstitution of cytochrome P450 3,9-dihydroxypterocarpan 6a-hydroxylase and separation from cytochrome P450 cinnamate 4-hydroxylase.

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Elicitor-challenged soybean (Glycine max) cell cultures were used for detergent solubilization and purification of cytochrome P450 3,9-dihydroxypterocarpan 6a-hydroxylase (D6aH). D6aH was purified to electrophoretic homogeneity from such cells by a five-step procedure. It could be separated from

Effects of CO(2) Enrichment and Carbohydrate Content on the Dark Respiration of Soybeans.

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During the period of most active leaf expansion, the foliar dark respiration rate of soybeans (Glycine max cv Williams), grown for 2 weeks in 1000 microliters CO(2) per liter air, was 1.45 milligrams CO(2) evolved per hour leaf density thickness, and this was twice the rate displayed by leaves of

Study of the effects of salicylic acid on soybean mitochondrial lipids and respiratory properties using the alternative oxidase as a stress-reporter protein.

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Biotic and abiotic stresses can lead to modifications in the lipid composition of cell membranes. Although mitochondria appear to be implicated in stress responses, little is known about the membrane lipid changes that occur in these organelles in plants. Besides cytochrome c oxidase, plant

Isolation of highly purified fractions of plasma membrane and tonoplast from the same homogenate of soybean hypocotyls by free-flow electrophoresis.

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A procedure is described whereby highly purified fractions of plasma membrane and tonoplast were isolated from hypocotyls of dark-grown soybean (Glycine max L. var Wayne) by the technique of preparative free-flow electrophoresis. Fractions migrating the slowest toward the anode were enriched in

Isolation and characterization of organelles from soybean suspension cultures.

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Whole homogenates from cells of Glycine max grown in suspension culture were centrifuged on linear sucrose gradients. Assays for marker enzymes showed that distinct peaks enriched in particular organelles were separated as follows: endoplasmic reticulum (density 1.10 g/cm(3), NADH-cytochrome-c

Characteristics of a phosphatidylinositol exchange activity of soybean microsomes.

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Microsome fractions from hypocotyls of dark-grown soybean (Glycine max [L.] Merrill) seedlings incorporated myo-inositol into phosphatidylinositol by an exchange reaction stimulated by Mn(2+) (optimum at 10 mm) and cytidine nucleotides (CMP = CDP approximately CTP) but not by Mg(2+) or nucleotides

NADH-Nitrate Reductase Inhibitor from Soybean Leaves.

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A NADH-nitrate reductase inhibitor has been isolated from young soybean (Glycine max L. Merr. Var. Amsoy) leaves that had been in the dark for 54 hours. The presence of the inhibitor was first suggested by the absence of nitrate reductase activity in the homogenate until the inhibitor was removed by

Monitoring programmed cell death triggered by mild heat shock in soybean-cultured cells

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Programmed cell death (PCD) is a common form of cellular demise during plant response to environmental stresses. The pathway of PCD has been partially clarified in plants although the underlying molecular mechanisms are still poorly defined. We have investigated the signalling cascade induced by a

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