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EC Number
pH Minimum
pH Maximum
Commentary
Reference
1.1.1.145
-999
-
metabolic conversion assays indicate peak 3betaHSD2 activity at pH 4.5 with 2fold more progesterone synthesized at pH 4.5 than at pH 3.5 and 7.4. Increasing the 3betaSD2 concentration from 1 to 40 microg results in a 7fold increase in progesterone at pH 4.5, but no change at pH 7.4. At pH 4-5, 3betaHSD2 takes on a molten globule conformation that promotes the dual functionality of the enzyme, i.e. 3 beta-hydroxysteroid dehydrogenase and Delta 5->4-isomerase activity
725511
1.1.1.145
2
12
approx. 50% of maximal activity at pH 4.0 and pH 10.0
657352
1.1.1.145
6.5
10
pH 6.5: about 55% of maximal activity, pH 10.0: about 45% of maximal activity
763139
1.1.1.145
6.8
9
-
389376
1.1.1.145
7.4
-
52% of maximal activity
656091
1.1.1.145
7.4
9.7
37% of maximal activity at pH 7.4
656577
1.1.1.145
7.4
9.7
structure motif-dependent pH dependence, overview
656091
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