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1988 (2)
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1978 (2)
1Author    Ulrich Lappe, Wolfgang BarzRequires cookie*
 Title    Degradation of Pisatin by Fungi of the Genus F u sa riu m  
 Abstract    Fifteen strains of Fusarium previously shown to degrade flavonoids and isoflavonoids were investigated for pisatin degradation. Fusarium anguioides and Fusarium avenaceum converted the phytoalexin (1) to the nontoxic 3,6a-dihy-droxy-8,9-methylenedioxypterocarpan (2). 
  Reference    Z. Naturforsch. 33c, 301 (1978); received February 21 1978 
  Published    1978 
  Keywords    Phytoalexin, Pisatin, Fusarium, Degradation, Demethylation 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0301_n.pdf 
 Identifier    ZNC-1978-33c-0301_n 
 Volume    33 
2Author    Klaus-MichaelW. Eltring, W. Olfgang BarzRequires cookie*
 Title    Degradation of 3,9-Dimethoxypterocarpan and Medicarpin by Fusarium proliferatum  
 Abstract    The degradation o f 3,9-dimethoxypterocarpan was investigated in selected strains of Fusarium. Fusarium proliferatum (/'. e. Gibberella fujikuroi (SAW)WR) degrades this substrate via 3-meth-oxy-9-hydroxypterocarpan, 3,9-dihydroxypterocarpan and 2',4',7-trihydroxyisoflavan. During degradation by this organism medicarpin is first demethylated to 3,9-dihydroxypterocarpan. 
  Reference    Z. Naturforsch. 35c, 399—405 (1980); received March 10 1980 
  Published    1980 
  Keywords    Phytoalexins, 3, 9-Dimethoxypterocarpan, Medicarpin, Fusarium, Degradation, Demethylation 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0399.pdf 
 Identifier    ZNC-1980-35c-0399 
 Volume    35 
3Author    Johannes Kösler, Monika Ohm, Wolfgang BarzRequires cookie*
 Title    Metabolism of Anthranilic Acid in Plant Cell Suspension Cultures  
 Abstract    Cell suspension cultures of some 12 plants were investigated for anthranilic acid metabolism. Rapid uptake of substrate is accompanied by partial excretion of anthranilic acid-N-glucoside and followed by predominant conversion into tryptophan. Ring cleavage reactions of anthranilate could not be observed but peroxidatic polymerisation occurred to a high percentage. Anthranilic acid-N-glucoside is not permanently stored by the cell cultures. 
  Reference    Z. Naturforsch. 33c, 368 (1978); received April 19 1978 
  Published    1978 
  Keywords    Anthranilic Acid, Plant Cell Suspension Cultures, Tryptophan, Glucoside, Degradation, Peroxidases 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0368.pdf 
 Identifier    ZNC-1978-33c-0368 
 Volume    33 
4Author    P. A. Bäumker, S. Arendt, R. WiermannRequires cookie*
 Title    Metabolism of Ferulic Acid Sucrose Esters in Anthers of Tulipa cv. Apeldoorn: II. Highly Specific Degradation of the Esters by Different Esterase Activities  
 Abstract    Protein extracts from anthers of Tulipa cv. Apeldoorn catalyze the degradation of ferulic acid sucrose esters. Different products are generated when triferuloyl sucrose (TFS) and diferuloyl sucrose (DFS) were applied as substrates. By the aid of reversed-phase HPLC, TLC and spectro-scopy the products could be identified as free ferulic acid, monoferuloyl sucrose ester [feruloyl-sucrose(mono)] and two different diesters of ferulic acid and sucrose [feruloylsucrose(di) and the endogenously occurring diferuloylsucrose (DFS)]. By means of protein fractionation (chromatofocusing, anion exchange HPLC and molecular sieving HPLC), four different enzyme activities involved in the degradation process could be separated. According to their catalytic properties, they were characterized as esterases (= EA). The partially purified esterase activity I (EA I) obtained after fractionation by chromatofocus-ing catalyzes the formation of feruloylsucrose(di) and ferulic acid when TFS is used as substrate. Incubations with EA la or EA lb isolated in smaller portions lead to the same product pattern. The esterase activity II (EA II) degrades TFS to ferulic acid and DFS. DFS as substrate is only accepted by the EA I activities, in all three cases ferulic acid and feruloyl sucrose(mono) are formed as products. The kinds of different degradation reactions clearly indicate that one enzyme (= the EA II activity) catalyzes exclusively the formation of DFS from TFS. Both enzymes, EA I and EA II, exhibit a high specificity towards ferulic acid sucrose esters. Hydroxycinnamic sucrose esters with only sinapic acid moieties do not function as substrates. When enzymatically formed sucrose esters like feruloylsucrose(di), feruloylsucrose(mono) and mono-sinapoylsucrose were used as substrates, no product formation could be observed. Applying SFS as substrate, only the ferulic acid moiety was released by EA I. Further, naturally occurring esters (glucose-and CoA-esters of p-coumaric, caffeic, ferulic and sinapic acid; chlorogenic acid; BGM) tested so far were not degraded by EA I and EA II. It is assumed that these esterase activities play a specific role in the ferulic acid metabolism in Tulipa anthers. 
  Reference    Z. Naturforsch. 43c, 647—655 (1988); received May 16 1988 
  Published    1988 
  Keywords    Tulipa cv Apeldoorn, Anthers, Ferulic Acid Sucrose Esters, Degradation, Esterases 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0647.pdf 
 Identifier    ZNC-1988-43c-0647 
 Volume    43 
5Author    Dieter Komoßa, Wolfgang BarzRequires cookie*
 Title    Glutaric Acid as a Catabolite of Nicotinic Acid in Parsley Cell Suspension Cultures  
 Abstract    A degradation product of nicotinic acid representing the pyridine carbon skeleton was isolated and purified from parsley cell suspension cultures after incubation with [6-14 C]nicotinic acid for 70 h. The catabolite was identified as glutaric acid by means of spectroscopic (GC-MS and 'H NMR) and chromatographic (TLC, HPLC) techniques. Glutaric acid when applied to parsley cell cultures was readily degraded to C0 2 but intermediate products could not be identified. 
  Reference    Z. Naturforsch. 43c, 843—849 (1988); received August 22 1988 
  Published    1988 
  Keywords    Nicotinic Acid, Degradation, Glutaric Acid, Petroselinum hortense, Cell Suspension Culture 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0843.pdf 
 Identifier    ZNC-1988-43c-0843 
 Volume    43