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Applied and Environmental Microbiology, February 2000, p. 684-687, Vol. 66, No. 2
Division of Medicinal and Natural Products
Chemistry, and Center for Biocatalysis and Bioprocessing, College
of Pharmacy, University of Iowa, Iowa City, Iowa 52242
Received 1 July 1999/Accepted 17 November 1999
The conversions of vanillic acid and O-benzylvanillic
acid to vanillin were examined by using whole cells and enzyme
preparations of Nocardia sp. strain NRRL 5646. With growing
cultures, vanillic acid was decarboxylated (69% yield) to guaiacol
and reduced (11% yield) to vanillyl alcohol. In resting
Nocardia cells in buffer, 4-O-benzylvanillic acid was converted to the
corresponding alcohol product without decarboxylation. Purified
Nocardia carboxylic acid reductase, an ATP and
NADPH-dependent enzyme, quantitatively reduced vanillic acid to
vanillin. Structures of metabolites were established by 1H
nuclear magnetic resonance and mass spectral analyses.
0099-2240/00/$04.00+0
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Biocatalytic Synthesis of Vanillin
*
Corresponding author. Mailing address: Division of
Medicinal and Natural Products and Center for Biocatalysis and
Bioprocessing, College of Pharmacy, University of Iowa, Iowa City, IA
52242. Phone: (319) 335-8842. Fax: (319) 335-8766. E-mail:
john-rosazza{at}uiowa.edu.
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