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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
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
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
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
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
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
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
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
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,
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 activity (=1 mumol/mg protein . 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
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
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 (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
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.