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'Silene' in keywords Facet   Publication Year 1981  [X]
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1981[X]
1Author    Jan Van Brederode, RiaK. Am, Ps-H EinsbroekRequires cookie*
 Title    Structure and Biosynthesis o f Vitexin 2"-0-Xyloside in Silene alba  
 Abstract    In petals o f Silene alba plants o f Armenian populations, vitexin 2"-0-xyloside was demonstrated to be present. The enzyme, catalyzing the transfer of the xylose moiety of UDP-xylose to vitexin, has its optimal activity at pH 7.8. Mg2+ and Mn2+ stimulated the reaction. The K m values were 2 x 10-5 M for vitexin and 3 x 10-5 M for UDP-xylose. 
  Reference    Z. Naturforsch. 36c, 484 (1981); received February 20 1981 
  Published    1981 
  Keywords    Silene, Caryophyllaceae, Biosynthesis, Vitexin 2"-0-Xyloside, Xylosyltransferase 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0484_n.pdf 
 Identifier    ZNC-1981-36c-0484_n 
 Volume    36 
2Author    Jan Van Brederode, Ria Kamps-HeinsbroekRequires cookie*
 Title    Methylation of 3',4' Di-O H C-Glycosyl- flavones in Silene  
 Abstract    In green parts of Silene plants of the genotype g lR two methylated flavonoids were found: isoscoparin and isosco-parin 2"-0-rhamnoside. An enzyme has been demonstrated to catalyze the transfer of the methyl moiety of S-adenosyl methionine to iso-orientin and iso-orientin 2"-0-rhamnosi-de. Maximal activity takes place at pH 8.0 -8 .2 . Of the me­ tal ions Mn2+, Mg2+, Ca2+, Co2+, Zn2+ and Hg2+, only Co2+ stimulated the reaction at conc. > 2 m M . For the methyla­ tion o f isoorientin the K m values were 4 x 10-6 M for S-ade-nosyl methionine and 0.32 x 10~3 m for iso-orientin. When isoorientin 2"-0-rhamnoside was used as substrate the K m values were 5 x 10"6 m for S-adenosylmethionine and 7 x 10-6 M for iso-orientin 2"-0-rhamnoside. 
  Reference    Z. Naturforsch. 36c, 486 (1981); received February 20 1981 
  Published    1981 
  Keywords    Silene, Caryophyllaceae, Methylation, Biosynthesis, Iso-scoparin 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0486_n.pdf 
 Identifier    ZNC-1981-36c-0486_n 
 Volume    36