TABLE 2.

Effect of xdh1 gene deletion in H. jecorina on total polyol dehydrogenase activities^a

Substrate (mM)	Mean ± SD U/mg of protein in:
	QM9414	ΔXDH1
Xylitol (150)	0.33 ± 0.05	0.11 ± 0.03
d-Sorbitol (150)	0.27 ± 0.04	0.08 ± 0.02
l-Arabinitol (150)	0.08 ± 0.02	0.06 ± 0.02
Galactitol (150)	<0.01 ± 0.005	<0.01 ± 0.005
d-Fructose (200)	0.02 ± 0.01	<0.01 ± 0.005
d-Xylulose (10)	0.08 ± 0.02	0.01 ± 0.005

^aStrains were grown for 24 h on d-xylose as a carbon source, and activities were determined as described in Materials and Methods.