Selective 4′-O-methylglycosylation of the pentahydroxy-flavonoid quercetin by Beauveria bassiana ATCC 7159

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Abstract

Biotransformation of the pentahydroxy-flavonoid natural product, quercetin, by Beauveria bassiana ATCC 7159 afforded a new derivative, quercetin-4′-O-methyl-7-β-D-glucopyranoside, in 87% isolated yield suggesting that glucosylation of the substrate occurred with high selectivity at C-7-OH out of the five hydroxyl groups. Most of the product was isolated from the mycelium and the filtrate of the culture medium did not show any catalytic activity. The mycelium is capable of performing this biotransformation when suspended in buffers of pH 2.1 and 7.2, suggesting that intracellular enzymes are involved and that they are active at a wide range of extracellular pH.

Original languageEnglish (US)
Pages (from-to)396-399
Number of pages4
JournalBiocatalysis and Biotransformation
Volume24
Issue number5
DOIs
StatePublished - Sep 1 2006

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Keywords

  • 4′-O-methyl-glycosylation
  • Intracellular enzymes
  • Quercetin
  • Selectivity

ASJC Scopus subject areas

  • Biotechnology
  • Catalysis
  • Biochemistry

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