971 resultados para [1-13C]-D-glucose


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A cell culture of Taxus chinensis was established to produce the diterpene 2alpha,5alpha,10beta,14beta-tetra-acetoxy4 ++ +(20),11-taxadiene (taxuyunnanine C) in 2.6% (dry weight) yield. The incorporation of [U-13C6]glucose, [1-13C]glucose, and [1,2-13C2]acetate into this diterpene was analyzed by NMR spectroscopy. Label from [1,2-13C2]acetate was diverted to the four acetyl groups of taxuyunnanine C, but not to the taxane ring system. Label from [1-13C]glucose and [U-13C6]glucose was efficiently incorporated into both the taxane ring system and the acetyl groups. The four isoprenoid moieties of the diterpene showed identical labeling patterns. The analysis of long-range 13C13C couplings in taxuyunnanine C obtained from an experiment with [U-13C6]glucose documents the involvement of an intramolecular rearrangement in the biosynthesis of the isoprenoid precursor. The labeling patterns are inconsistent with the mevalonate pathway. The taxoid data share important features with the alternative pathway of isoprenoid biosynthesis operating in certain eubacteria Rohmer, M., Knani, M., Simonin, P., Sutter, B. & Sahm, H. (1993) Biochem. J. 295, 517-524].

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ADPglucose pyrophosphorylase (glucose-1-phosphate adenylyltransferase; ADP:alpha-D-glucose-1-phosphate adenylyltransferase, EC 2.7.7.27) catalyzes a key regulatory step in alpha-glucan synthesis in bacteria and higher plants. We have previously shown that the expression of the cDNA sequences of the potato tuber large (LS) and small (SS) subunits yielded a functional heterotetrameric enzyme capable of complementing a mutation in the single AGP (glgC) structural gene of Escherichia coli. This heterologous complementation provides a powerful genetic approach to obtain biochemical information on the specific roles of LS and SS in enzyme function. By mutagenizing the LS cDNA with hydroxylamine and then coexpressing with wild-type SS in an E. coli glgC- strain, >350 mutant colonies were identified that were impaired in glycogen production. One mutant exhibited enzymatic and antigen levels comparable to the wild-type recombinant enzyme but required 45-fold greater levels of the activator 3-phosphoglycerate for maximum activity. Sequence analysis identified a single nucleotide change that resulted in the change of Pro-52 to Leu. This heterologous genetic system provides an efficient means to identify residues important for catalysis and allosteric functioning and should lead to novel approaches to increase plant productivity.

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Vol. 1: Mémoires sur la vie, l'administration et les ouvrages de M. Turgot, by the editor, Dupont de Nemours.

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La primera edición de esta obra se publicó en Londres con el título "An account of the voyages undertaken by the order of his present Majesty..." (London : printed for W. Strahan & T. Cadell, 1773). La segunda edición es del mismo lugar, editor y año que la primera (London: printed for W. Strahan & T. Cadell, 1773). La tercera edición inglesa es de London: W. Strahan [etc.], 1785. Este registro bibliográfico se refiere a la primera edición francesa, constituida por 4 volúmenes.

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Contiene: [vol. 1] Collection d'observations sur les maladies et constitutions épidémiques, premiere partie .- [vol. 2] Collection d'observations sur les maladies et constitutions épidémiques, années 1763 à 1770 : 1771 à 1778, II, III [et] IV parties.

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Contiene: T. 1: Traité d'insectologie, ou observations sur les pucerons -- T. 2: Traité d'insectologie, ou observations sur quelques espèces de vers d'eau douce qui coutés par morceaux deviennent autant d'animaux complets.

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Vol. 5 (or 4, pt. 2) has title: Addizioni e correzioni ... [etc.]

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Half-title of v. 1: Annali d'Italia, scritti da L-A. Muratori e continuati da G-V.B.

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v.1. Chronique d'Amadi.--v.2. Chronique de Strambaldi.

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t.1. 2. éd., 1862.--t.2. 2. éd., 1862.--t.3. 3. éd., 1864.--t.4. 2. éd., 1863.--t.5. 2. éd., 1863.--t.6. 5. éd., 1864.--t.7. 1864.

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1. Relation d'un voyage sur les côtes de Barbarie fait en 1724 et 1725; par Jean André Peyssonnel.--2. Fragmens d'un voyage dans les régences de Tunis et d'Alger fait de 1783 à 1786; par L.R. Desfontaines. Appendice: Notice sur la ville de Constantine.

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[v. 1]: 3. éd., rev. et augm. de quelques notes.

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Translated by J.J. Moutonnet de Clairfons.