Conversion of Carbon-14-Labeled Urea into Amino Acids in Leaves.
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چکیده
منابع مشابه
Transport, metabolism, and redistribution of xylem-borne amino acids in developing pea shoots.
Amino acid metabolism and transport was investigated in the leaves of 3-week-old nonnodulated seedlings of Pisum sativum L. Xylem sap entering the shoot contained nitrate (about 5 millimolar), and amino compounds (11 millimolar) of which 70% was asparagine plus glutamine; aspartate and homoserine were also present. Mature leaves showed stable nitrogen levels and incoming nitrogen was redistribu...
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l-Canavanine, the guanidinooxy structural analog of l-arginine, is an important nonprotein amino acid of many leguminous plants with nitrogen storage a major proported role. l-[Guanidinooxy-(14)C]canavanine, [(14)C] urea, and [(15)N]urea were injected separately into the fleshy, green cotyledons of 9-day old jack bean plants, Canavalia ensiformis (L.) DC. [Leguminosae]. There was significant tr...
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Cells of the unicellular cyanobacterium Synechocystis sp. strain PCC 6803 supplemented with micromolar concentrations of L-[(14)C]arginine took up, concentrated, and catabolized this amino acid. Metabolism of L-[(14)C]arginine generated a set of labeled amino acids that included argininosuccinate, citrulline, glutamate, glutamine, ornithine, and proline. Production of [(14)C]ornithine preceded ...
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We have reported in this journal1) the biosynthesis of the glycocinnamoyl moieties of the antibiotic cinodine (Fig. 1), the broad-spectrum antibiotic discovered and identified at the Lederle Laboratories2,3). The glycocinnamoyl moieties were found to originate directly from D-glucosamine and L-tyrosine by isotope incorporation studies. The biosynthesis of the rest of the molecule, i.e., the spe...
متن کاملIncorporation of Radioactive Acetate and Sucrose into Amino Acids and Protein of Excised Organs of Red Kidney Bean.
Little information is available on rates of incorporation of C14-labeled amino acids into plant protein. The first reported work was that of Arreguin, Bonner and Wood (1) in 1951 in which C14-carboxvl-labeled acetate was supplied to guayule plants. The bulk of the radioactivity in the protein fraction was located in leucine, glutamate and aspartate. Boroughs and Bonner (4) incubated C14-carboxy...
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عنوان ژورنال:
- Plant physiology
دوره 30 4 شماره
صفحات -
تاریخ انتشار 1955