| | 1 | Author
| R. B. Herbert, J. Mann, A. Römer | Requires cookie* | | | Title
| Phenazine and Phenoxazinone Biosynthesis in Brevibacterium iodinum  | | | | Abstract
| The source o f nitrogen in the phenazine, iodinin 5, and in 2-aminophenoxazinone 7 in Brevi bacterium iodinum cultures is shown to be primarily from the amide nitrogen of glutamine in ex periments with (S)-[C 015N H 2]glutamine, [15N]ammonium sulphate, and (S)-[15N]glutamic acid. The biosynthesis of 5 and 7 is closely related; biosynthesis o f 7 like that o f 5 diverts from the shi-kimic acid pathway at a stage prior to anthranilic acid 8. | | | |
Reference
| Z. Naturforsch. 37c, 159 (1982); received October 23/December 151981 | | | |
Published
| 1982 | | | |
Keywords
| Phenazines, Phenoxazinones, Biosynthesis, Brevibacterium iodinum, Nitrogen Incorporation | | | |
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| default:Reihe_C/37/ZNC-1982-37c-0159.pdf | | | | Identifier
| ZNC-1982-37c-0159 | | | | Volume
| 37 | |
| 2 | Author
| PaulM. Dewick, M. Elanie, J. Steele, RichardA. Dixon, IanM W Hitehead | Requires cookie* | | | Title
| Biosynthesis of Isoflavonoid Phytoalexins: Incorporation of Sodium |1,2-13C2] Acetate into Phaseollin and Kievitone | | | | Abstract
| 13C-NMR analysis of the isoflavonoid phytoalexins phaseollin and kievitone produced by feeding sodium [l,2-13C2]acetate to wounded bean (Phaseolus vulgaris) cotyledons has demon strated the incorporation of intact acetate units into the aromatic A rings. Phaseollin shows a specific folding of the polyketide chain, whereas kievitone exhibits a randomisation of label in accordance with the intermediacy of a 2',4',6'-trihydroxylated chalcone during its formation. In neither case was sufficient label incorporated into analysis. | | | |
Reference
| Z. Naturforsch. 37c, 363—368 (1982); received February 18 1982 | | | |
Published
| 1982 | | | |
Keywords
| Biosynthesis, 13C-NMR, Phytoalexin, Phaseollin, Kievitone, Isoflavonoid | | | |
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| default:Reihe_C/37/ZNC-1982-37c-0363.pdf | | | | Identifier
| ZNC-1982-37c-0363 | | | | Volume
| 37 | |
| 3 | Author
| G. Stotz, G. Forkm | Requires cookie* | | | Title
| Hydroxylation of the B-Ring of Flavonoids in the 3'-and 5'-Position with Enzyme Extracts from Flowers of Verbena hybrida | | | | Abstract
| Enzyme preparations from flowers of Verbena hybrida do not only catalyse hydroxylation of the B-ring of flavanones and dihydroflavonols in the 3'-position but also in the 5'-position. Enzyme activity for 3',5'-hydroxylation was found to be localized in the microsomal fraction and required NADPH as cofactor. Evidence is provided that the formation o f the 3',4\5'-hydroxylated flavanone (5,7,3',4',5'-pentahydroxyflavanone) and dihydroflavonol (dihydromy-ricetin), respectively, proceeds via the corresponding 3',4'-hydroxylated compounds eriodictyol and dihydroquercetin, respectively, which are most probably formed by action o f the same enzyme. Enzyme activity for 3',5'-hydroxylation was found to be strictly correlated with the prescence of 3',4',5'-hydroxylated flavonoid compounds in the flowers. | | | |
Reference
| Z. Naturforsch. 37c, 19—23 (1982); received October 141981 | | | |
Published
| 1982 | | | |
Keywords
| Anthocyanins, Flavonoids, Biosynthesis, Flavonoid 3', 5'-Hydroxylation, Verbena hybrida | | | |
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| default:Reihe_C/37/ZNC-1982-37c-0019.pdf | | | | Identifier
| ZNC-1982-37c-0019 | | | | Volume
| 37 | |
| 5 | Author
| A. Römer, R. B. Herbert | Requires cookie* | | | Title
| Further Observations on the Source of Nitrogen in Phenazine Biosynthesis | | | | Abstract
| It is concluded from experiments with (S)-[C015NH2]glutamine and [15N]ammonium sulphate that the biosynthesis of iodinin (1), in Brevibacterium iodinum, and of phenazine-1-carboxylic acid (7), in Pseudomonas aureofaciens, is primarily from a single nitrogen source (glutamine) and that | | | |
Reference
| Z. Naturforsch. 37c, 1070—1074 (1982); received July 26 1982 | | | |
Published
| 1982 | | | |
Keywords
| Phenazines, Biosynthesis, Nitrogen Incorporation, Brevibacterium iodinum, Pseudomonas aureofa-ciens | | | |
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| default:Reihe_C/37/ZNC-1982-37c-1070.pdf | | | | Identifier
| ZNC-1982-37c-1070 | | | | Volume
| 37 | |
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