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Molecular cloning and characterization of a cDNA encoding asparagine synthetase from soybean (Glycine max L.) cell cultures.

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A cDNA encoding glutamine-dependent asparagine synthetase was isolated from dark-adapted Glycine max cell culture. The deduced amino acid sequence showed 76-89% identity with other plant sequences. The gene for asparagine synthetase is expressed predominantly in shoots as compared to roots of

A new peptide-N4-(acetyl-beta-glucosaminyl)asparagine amidase from soybean (Glycine max) seeds: purification and substrate specificity.

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We report here the isolation and characterization of a peptide-N4-(acetyl-beta-glucosaminyl) asparagine amidase (peptide: N-glycanase) from soybean (Glycine max) seeds. The enzyme was purified to homogeneity with 6.5% yield from defatted soybean meal extract by ion-exchange chromatography, gel

Isolation of an auxotrophic cell line of soybean (Glycine max) which requires asparagine or glutamine for growth.

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A suspension culture of haploid soybean cells was treated with ultra-violet light. From the mutagenized culture an auxotrophic cell line was isolated which grows on 1-B5 media supplemented with asparagine or glutamine. In the absence of these additives the cells cease to grow and die. Asparagine is

Nitrogen stress and the expression of asparagine synthetase in roots and nodules of soybean (Glycine max).

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The difficulty of assaying asparagine synthetase (AS) (EC 6.3.5.4) activity in roots of soybean has been circumvented by measuring expression of the AS genes. Expression of three soybean asparagine synthetase (SAS) genes (SAS1, SAS2 and SAS3) was observed in roots of non-nodulated soybean plants

Low Temperature Effects on Soybean (Glycine max [L.] Merr. cv. Wells) Free Amino Acid Pools during Germination.

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The free amino acid concentrations in cotyledons and axes of soybean (Glycine max [L.] Merr. cv. Wells) seedlings were determined by automated single column analysis after germination at 10 and 23 C. After 5 days germination at 10 C, glutamate and aspartate were in high concentration in both

Plantlet regeneration from immature cotyledon protoplasts of soybean (Glycine max L.).

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Protoplasts were isolated from immature cotyledons of Glycine max L. Merr. cv. Clark 63 and cultured in liquid or in agarose-gelled modified KP8 medium. Plating efficiencies of 45-50% were obtained in liquid medium and 55-60% in 1.2% (w/v) agarose beads. Upon regular dilution with K8 medium rapidly

De Novo Purine Synthesis in Nitrogen-Fixing Nodules of Cowpea (Vigna unguiculata [L.] Walp.) and Soybean (Glycine max [L.] Merr.).

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Partially purified, cell-free extracts from nodules of cowpea (Vigna unguiculata L. Walp. cv. Caloona) and soybean (Glycine max L. Merr. cv. Bragg) showed high rates of de novo purine nucleotide and purine base synthesis. Activity increased with rates of nitrogen fixation and ureide export during

[N]NMR determination of asparagine and glutamine nitrogen utilization for synthesis of storage protein in developing cotyledons of soybean in culture.

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Solid-state [(15)N]NMR was used to measure the use of the amide and amino nitrogens of glutamine and asparagine for synthesis of storage protein in cotyledons of soybean (Glycine max L. cv. Elf) in culture. No major discrimination in the incorporation of the amide or amino nitrogens of glutamine

Formation of highly ordered cross-linked lattices between asparagine-linked oligosaccharides and lectins observed by electron microscopy.

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The interaction of asparagine-linked carbohydrates (N-linked) with carbohydrate binding proteins called lectins has been demonstrated to be involved in a variety of cellular recognition processes. Certain N-linked carbohydrates have been shown to be multivalent and capable of binding, cross-linking,

Development of nodules of Glycine max infected with an ineffective strain of Rhizobium japonicum.

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Bacteroids in ineffective (nitrogenase negative) nodules of Glycine max, infected with Rhizobium japonicum 61-A-24, as compared to those in effective nodules are characterized by reduced specific activities of alanine dehydrogenase to 15%, of 3-hydroxybutyrate dehydrogenase to 50%, and an increase

Asparaginase and asparagine transaminase in soybean leaves and root nodules.

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Asparaginase activity (n . hr) was detected in extracts of soybean (Glycine max [L.] Merr.) leaf blades, but, even after efforts to optimize extraction and assay of the enzyme, specific activity was not sufficient to metabolize the estimated amount of asparagine translocated to

A Pod Leakage Technique for Phloem Translocation Studies in Soybean (Glycine max [L.] Merr.).

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Radioactive photosynthetic assimilates, translocated to a soybean (Glycine max [L.] Merr. ;Fiskeby V') pod can be measured directly by excising the stylar tip of the pod under 20 mm ethylenediaminetetraacetate solution (pH 7.0) and allowing the material to leak into the solution. Pods at the source

Initial Organic Products of Fixation of [N]Dinitrogen by Root Nodules of Soybean (Glycine max).

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When detached soybean Glycine max (L.) Merr. cv. Hark, nodules assimilate [(13)N]N(2), the initial organic product of fixation is glutamine; glutamate becomes more highly radioactive than glutamine within 1 minute; (13)N in alanine becoms detectable at 1 minute of fixation and increases rapidly

Asparagine biosynthesis in soybean nodules.

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Asparagine biosynthesis in soybean (Glycine max [L.] Merr.) nodules has been difficult to demonstrate due to the poor conversion of suspected immediate precursors to asparagine and the instability of the key enzyme asparagine synthetase. The present study was designed to explore the effects of two

Asparagine and boric Acid cause allantoate accumulation in soybean leaves by inhibiting manganese-dependent allantoate amidohydrolase.

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Our previous work demonstrated substantial accumulation of allantoate in leaf tissue of nodulated soybeans (Glycine max L. Merr., cv Williams) in response to nitrogen fertilization. Research was continued to determine the effect of nitrate and asparagine on ureide assimilation in soybean leaves.

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