Li T, Rosazza J P
Division of Medicinal and Natural Products Chemistry, and Center for Biocatalysis and Bioprocessing, College of Pharmacy, University of Iowa, Iowa City, Iowa 52242, USA.
Appl Environ Microbiol. 2000 Feb;66(2):684-7. doi: 10.1128/AEM.66.2.684-687.2000.
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 (1)H nuclear magnetic resonance and mass spectral analyses.
利用诺卡氏菌属菌株NRRL 5646的全细胞和酶制剂,研究了香草酸和邻苄基香草酸向香草醛的转化。在生长培养物中,香草酸脱羧生成愈创木酚(产率69%),并还原生成香草醇(产率11%)。在缓冲液中的静止诺卡氏菌细胞中,4-邻苄基香草酸转化为相应的醇产物,且未发生脱羧反应。纯化的诺卡氏菌羧酸还原酶是一种依赖ATP和NADPH的酶,可将香草酸定量还原为香草醛。通过核磁共振氢谱和质谱分析确定了代谢产物的结构。