1.1.1.145: 3beta-hydroxy-DELTA5-steroid dehydrogenase

This is an abbreviated version, for detailed information about 3beta-hydroxy-DELTA5-steroid dehydrogenase, go to the full flat file.

Reaction

a 3beta-hydroxy-DELTA5-steroid
+
NAD+
=
a 3-oxo-DELTA5-steroid
+
NADH
+
H+

Synonyms

3-beta-hydroxy-5-ene steroid dehydrogenase, 3-beta-hydroxy-delta(5)-steroid dehydrogenase, 3beta hydroxysteroid dehydrogenase, 3beta-HSD, 3beta-HSD type II, 3beta-HSD1, 3beta-HSD2, 3beta-HSD22, 3beta-HSDH, 3beta-HSD_1, 3beta-hydroxy steroid dehydrogenase/5-ene-4-ene isomerase, 3beta-hydroxy steroid dehydrogenase/isomerase, 3beta-hydroxy-5-ene steroid dehydrogenase, 3beta-hydroxy-5-ene-steroid dehydrogenase, 3beta-hydroxy-5-ene-steroid oxidoreductase, 3beta-hydroxy-DELTA5-C27-steroid dehydrogenase/isomerase, 3beta-hydroxy-DELTA5-C27-steroid oxidoreductase, 3beta-hydroxysteroid dehydrogenase, 3beta-hydroxysteroid dehydrogenase 1, 3beta-hydroxysteroid dehydrogenase type 1, 3beta-hydroxysteroid dehydrogenase type 2, 3beta-hydroxysteroid dehydrogenase type II, 3beta-hydroxysteroid dehydrogenase type1, 3beta-hydroxysteroid dehydrogenase/DELTA5-DELAT4 isomerase type 2, 3beta-hydroxysteroid dehydrogenase/DELTA5-DELTA4 isomerase, 3beta-hydroxysteroid dehydrogenase/DELTA5-DELTA4-isomerase, 3beta-hydroxysteroid dehydrogenase/DELTA5-DELTA4-isomerase type II, 3beta-hydroxysteroid dehydrogenase/isomerase, 3beta-hydroxysteroid dehydrogenase/isomerase type 1, 3betaHSD, 3betaHSD1, 3betaHSD2, 5-ene-3-beta-hydroxysteroid dehydrogenase, 5alpha-dihydrotestosterone 3beta-hydroxysteroid dehydrogenase, dehydrogenase, 3beta-hydroxy-DELTA5-steroid, DELTA5-3beta-hydroxysteroid dehydrogenase, DHRS4, HSD3B, HSD3B2, HSDB1, More, progesterone reductase, steroid-DELTA5-3beta-ol dehydrogenase, type 1 3beta-hydroxysteroid dehydrogenase, type 1 3beta-hydroxysteroid dehydrogenase/isomerase, type 2 3beta-hydroxysteroid dehydrogenase, type 2 3beta-hydroxysteroid dehydrogenase/isomerase

ECTree

     1 Oxidoreductases
         1.1 Acting on the CH-OH group of donors
             1.1.1 With NAD+ or NADP+ as acceptor
                1.1.1.145 3beta-hydroxy-DELTA5-steroid dehydrogenase

pH Range

pH Range on EC 1.1.1.145 - 3beta-hydroxy-DELTA5-steroid dehydrogenase

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pH RANGE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
2 - 12
-
approx. 50% of maximal activity at pH 4.0 and pH 10.0
6.8 - 9
-
-
7.4 - 9.7
7.4
52% of maximal activity
additional information
-
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