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IUBMB CommentsThe enzyme from the archaeon Sulfolobus solfataricus shows broad specificity towards aldoses (D-glucose, D-galactose, D-xylose, L-arabinose, 6-deoxy-D-glucose, D-fucose) and can utilize NAD+ and NADP+ with similar catalytic efficiency. It is involved in aldose catabolism via the branched variant of the Entner-Doudoroff pathway.
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2-deoxy-D-glucose + NADP+ + H2O
?
-
-
-
?
6-deoxy-D-glucose + NAD+ + H2O
?
-
-
-
?
6-deoxy-D-glucose + NADP+ + H2O
?
-
-
-
?
beta-D-glucose + NAD+ + H2O
D-gluconate + NADH + 2 H+
beta-D-glucose + NADP+ + H2O
D-gluconate + NADPH + 2 H+
D-altrose + NADP+ + H2O
?
-
-
-
?
D-fucose + NAD+ + H2O
?
-
-
-
?
D-fucose + NADP+ + H2O
?
-
-
-
?
D-galactose + NAD+ + H2O
?
-
-
-
?
D-galactose + NAD+ + H2O
D-galactonate + NADH + 2 H+
D-galactose + NADP+ + H2O
D-galactonate + NADPH + 2 H+
L-arabinose + NAD+ + H2O
?
-
-
-
?
L-arabinose + NADP+ + H2O
?
additional information
?
-
beta-D-glucose + NAD+ + H2O

D-gluconate + NADH + 2 H+
-
-
-
ir
beta-D-glucose + NAD+ + H2O
D-gluconate + NADH + 2 H+
-
-
-
ir
beta-D-glucose + NAD+ + H2O
D-gluconate + NADH + 2 H+
kcat/Km for beta-D-glucose in the reaction with NAD+ is 1.4fold higher than the kcat/Km value for beta-D-glucose in the reaction with NADP+
-
-
ir
beta-D-glucose + NAD+ + H2O
D-gluconate + NADH + 2 H+
when NAD+ serves as electron acceptor, D-glucose is oxidized at the highest rate among the substrates tested. No reverse reaction is evident, under various reaction conditions, when gluconic acid is used as substrate
-
-
ir
beta-D-glucose + NAD+ + H2O
D-gluconate + NADH + 2 H+
-
-
-
ir
beta-D-glucose + NADP+ + H2O

D-gluconate + NADPH + 2 H+
-
-
-
ir
beta-D-glucose + NADP+ + H2O
D-gluconate + NADPH + 2 H+
-
-
-
ir
beta-D-glucose + NADP+ + H2O
D-gluconate + NADPH + 2 H+
it is likely that the first product of this reaction is delta-gluconolactone, which is readily converted into the acid. The lactone hydrolysis is facilitated by the high temperature and the slight alkaline pH value of the standard reaction conditions, thus explaining why no reverse reaction is observed under these conditions when delta-gluconolactone is used as substrate. A very slow NADH-dependent reduction of delta-gluconolactone by glucose dehydrogenase is observed at pH 7.0 and 37°C
-
-
?
beta-D-glucose + NADP+ + H2O
D-gluconate + NADPH + 2 H+
kcat/Km for beta-D-glucose in the reaction with NADP+ is 1.4fold lower than the kcat/Km value for beta-D-glucose in the reaction with NAD+
-
-
ir
beta-D-glucose + NADP+ + H2O
D-gluconate + NADPH + 2 H+
-
-
-
?
beta-D-glucose + NADP+ + H2O
D-gluconate + NADPH + 2 H+
-
-
-
ir
D-galactose + NAD+ + H2O

D-galactonate + NADH + 2 H+
-
-
-
?
D-galactose + NAD+ + H2O
D-galactonate + NADH + 2 H+
-
-
-
?
D-galactose + NAD+ + H2O
D-galactonate + NADH + 2 H+
-
-
-
?
D-galactose + NADP+ + H2O

D-galactonate + NADPH + 2 H+
-
-
-
?
D-galactose + NADP+ + H2O
D-galactonate + NADPH + 2 H+
-
-
-
?
D-galactose + NADP+ + H2O
D-galactonate + NADPH + 2 H+
the activity is 70% of the activity with beta-D-glucose + NADP+
-
-
?
D-xylose + NAD+ + H2O

?
-
-
-
?
D-xylose + NAD+ + H2O
?
-
-
-
?
D-xylose + NADP+ + H2O

?
-
-
-
?
D-xylose + NADP+ + H2O
?
-
-
-
?
D-xylose + NADP+ + H2O
?
-
-
-
?
L-arabinose + NADP+ + H2O

?
-
-
-
?
L-arabinose + NADP+ + H2O
?
no activity with NAD+
-
-
?
L-arabinose + NADP+ + H2O
?
-
-
-
?
additional information

?
-
the enzyme iss involved in aldose catabolism via the branched variant of the EntnerDoudoroff pathway
-
-
?
additional information
?
-
no activity with mannose or glucose 6-phosphate
-
-
?
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Ca2+
20 mM, maximal activation of enzyme inactivated by dialysis against Mg2+-free 20 mM-triethanolamine/HCl buffer, pH 7.0
Mg2+
20 mM, maximal activation of enzyme inactivated by dialysis against Mg2+-free 20 mM-triethanolamine/HCl buffer, pH 7.0
Mn2+
20 mM, maximal activation of enzyme inactivated by dialysis against Mg2+-free 20 mM-triethanolamine/HCl buffer, pH 7.0
Zinc
the enzyme possess the catalytic zinc binding residues Cys-39 and His-66
additional information

Ni2+, Cd2+ and univalent cations are ineffective in promoting enzyme reactivation
additional information
no significant increase in the presence of ZnCl2, CaCl2, or MgCl2, at final concentrations of 0.1 mM
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0.44 - 72.5
beta-D-glucose
additional information
NAD+
Km is superior to 30 mM. The Km value for NAD+ can not be defined precisely as it is impossible to reach saturation of the enzyme
0.44
beta-D-glucose

pH 9.0, 70°C, cosubstrate: NADP+
1.3
beta-D-glucose
pH 6.5, 70°C, cosubstrate: NADP+
1.3
beta-D-glucose
pH 7.5, 70°C, cofactor: NADP+
1.3
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
1.5
beta-D-glucose
pH 6.5, 70°C, cosubstrate: NAD+
1.5
beta-D-glucose
pH 7.5, 70°C, cofactor: NAD+
1.5
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
8
beta-D-glucose
pH 9.0, 70°C, cosubstrate: NAD+
9.4
beta-D-glucose
pH 8.0, 55°C
10
beta-D-glucose
pH 7.0, 55°C
24.8
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
33.3
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
59
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
72.5
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
0.44
D-galactose

pH 6.5, 70°C, cosubstrate: NADP+
0.44
D-galactose
pH 7.5, 70°C, cofactor: NADP+
0.44
D-galactose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
0.57
D-galactose
pH 6.5, 70°C, cosubstrate: NAD+
0.57
D-galactose
pH 7.5, 70°C, cofactor: NAD+
0.57
D-galactose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
22
D-galactose
pH 9.0, 70°C, cosubstrate: NADP+
109
D-galactose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
118
D-galactose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
175
D-galactose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
204
D-galactose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
0.18
D-xylose

pH 8.0, 70°C, recombinant enzyme
0.18
D-xylose
pH 6.5, 70°C, cosubstrate: NADP+
0.18
D-xylose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
0.18
D-xylose
pH 8.0, 70°C, native enzyme from xylose-grown cell extract
0.25
D-xylose
pH 6.5, 70°C, cosubstrate: NAD+
0.25
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
2.2
D-xylose
pH 9.0, 70°C, cosubstrate: NADP+
20.4
D-xylose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
29.2
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
65.8
D-xylose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
68
D-xylose
pH 9.0, 70°C, cosubstrate: NAD+
76.3
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
0.47
L-arabinose

pH 8.0, 70°C, native enzyme from xylose-grown cell extract
0.5
L-arabinose
pH 8.0, 70°C, recombinant enzyme
0.5
L-arabinose
pH 6.5, 70°C, cosubstrate: NAD+
1.2
NAD+

pH 9.0, 70°C, cosubstrate: beta-D-glucose
1.2
NAD+
pH 9.0, 70°C, cosubstrate: D-xylose
0.03
NADP+

pH 9.0, 70°C, cosubstrate: beta-D-glucose
0.03
NADP+
pH 9.0, 70°C, cosubstrate: D-galactose
0.03
NADP+
pH 9.0, 70°C, cosubstrate: D-xylose
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41
L-arabinose
pH 6.5, 70°C, cosubstrate: NAD+
4
beta-D-glucose

pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
6
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
14
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
39
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
47.7
beta-D-glucose
pH 6.5, 70°C, cosubstrate: NADP+
47.7
beta-D-glucose
pH 7.5, 70°C, cofactor: NADP+
48
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
74.9
beta-D-glucose
pH 6.5, 70°C, cosubstrate: NAD+
74.9
beta-D-glucose
pH 7.5, 70°C, cofactor: NAD+
75
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
7
D-galactose

pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
8
D-galactose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
22
D-galactose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
37
D-galactose
pH 6.5, 70°C, cosubstrate: NADP+
37
D-galactose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
37.4
D-galactose
pH 7.5, 70°C, cofactor: NADP+
56
D-galactose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
61
D-galactose
pH 6.5, 70°C, cosubstrate: NAD+
61
D-galactose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
61.3
D-galactose
pH 7.5, 70°C, cofactor: NAD+
7
D-xylose

pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
12
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
22
D-xylose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
44
D-xylose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
47
D-xylose
pH 6.5, 70°C, cosubstrate: NADP+
61
D-xylose
pH 6.5, 70°C, cosubstrate: NAD+
61
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
81
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
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82
L-arabinose
pH 6.5, 70°C, cosubstrate: NAD+
0.07
beta-D-glucose

pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
0.09
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
0.4
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
1.6
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
36.7
beta-D-glucose
pH 6.5, 70°C, cosubstrate: NADP+
36.7
beta-D-glucose
pH 7.5, 70°C, cofactor: NADP+
37
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
49.9
beta-D-glucose
pH 6.5, 70°C, cosubstrate: NAD+
49.9
beta-D-glucose
pH 7.5, 70°C, cofactor: NAD+
50
beta-D-glucose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
0.04
D-galactose

pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
0.04
D-galactose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
0.2
D-galactose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
0.5
D-galactose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
85
D-galactose
pH 6.5, 70°C, cosubstrate: NADP+
85
D-galactose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
85.1
D-galactose
pH 7.5, 70°C, cofactor: NADP+
107
D-galactose
pH 7.5, 70°C, cofactor: NAD+
108
D-galactose
pH 6.5, 70°C, cosubstrate: NAD+
108
D-galactose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
0.11
D-xylose

pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41V
0.15
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41V
1.1
D-xylose
pH 7.5, 70°C, cosubstrate: NADP+, mutant enzyme T41A
2.8
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, mutant enzyme T41A
245
D-xylose
pH 6.5, 70°C, cosubstrate: NAD+
245
D-xylose
pH 7.5, 70°C, cosubstrate: NAD+, wild-type enzyme
246
D-xylose
pH 7.5, 70°C, cosubstrate: NADP+, wild-type enzyme
261
D-xylose
pH 6.5, 70°C, cosubstrate: NADP+
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