Metagenomic approach for the isolation of a thermostable β-galactosidase with high tolerance of galactose and glucose from soil samples of Turpan Basin

Table 4 Inhibition types and inhibitor constants ( K _i ) of several β-galactosidases

Enzyme source	Substrate	Inhibitor	Inhibition type	K_i(mM)	Reference
Thermus sp. T2	ONPG	Galactose	Competitive	3	[10]
Thermus sp. T2	ONPG	Glucose	Noncompetitive	50	[10]
C. saccharolyticus	pNPG	Galactose	Noncompetitive	12	[13]
C. saccharolyticus	pNPG	Glucose	Noncompetitive	1170	[13]
K. lactis	ONPG	Galactose	Competitive	45	[14]
K. lactis	ONPG	Glucose	Noncompetitive	758	[14]
L. reuteri	ONPG	Galactose	Competitive	115	[15]
L. reuteri	ONPG	Glucose	Competitive	683	[15]
Arthrobacter sp.	ONPG	Galactose	Competitive	12	[29]
H. courbaril	pNPG	Galactose	Competitive	4	[30]
S. solfataricus	ONPG	Glucose	Competitive	96	[31]
Unculturable microbes	ONPG	Galactose	Competitive	238	This study
Unculturable microbes	ONPG	Glucose	Competitive	1725	This study

ISSN: 1471-2180