In this study, gk gene was disrupted from xylitol dehydrogenase gene
(XYL2) knockout C. tropicalis strain BSXDH-3. The resulting strain was
incapable to grow on glycerol. The cells growth on glycerol was resumed
by co-expression of gcy1, 2 and 3 genes from Scheffersomyces stipitis
under the control of C. tropicalis glyceraldehydes-3-phosphate
dehydrogenase (GAPDH) promoter. NADPH-dependent xylitol production was
higher in the engineered strain, termed "IA-3", than in BSXDH-3. The
pentose phosphate pathway (PPP) is a major basis of NADPH biosynthesis
in C. tropicalis. In order to increase xylitol production rate, xylitol
dehydrogenase gene (XYL2)-disrupted C. tropicalis strain BSXDH-3 was
engineered to co-express zwf and gnd genes, which respectively encode
glucose-6-phosphate dehydrogenase (G6PDH) and 6-phosphogluconate
dehydrogenase (6-PGDH), under the control of glyceraldehyde-3-phosphate
dehydrogenase (GAPDH) promoter. NADPH-dependent xylitol production was
higher in the engineered strain, termed "PP", than in BSXDH-3. This is
the first report of increased metabolic flux toward glycerol metabolic
and PPP in C. tropicalis for NADPH regeneration and enhanced xylitol
production.