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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.

Word Map on EC 1.1.1.145

Reaction

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

Synonyms

3 beta- and steroid deltaisomerase 1, 3-beta-hydroxy-5-ene steroid dehydrogenase, 3-beta-hydroxy-delta(5)-steroid dehydrogenase, 3-beta-hydroxysteroid dehydrogenase, 3-beta-hydroxysteroid dehydrogenase type-2, 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 2, 3beta-hydroxysteroid dehydrogenase type 1, 3beta-hydroxysteroid dehydrogenase type 2, 3beta-hydroxysteroid dehydrogenase type 2 and, 3beta-hydroxysteroid dehydrogenase type II, 3beta-hydroxysteroid dehydrogenase type1, 3beta-hydroxysteroid dehydrogenase/3-ketosteroid reductase, 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, 3beta-hydroxysteroid dehydrogenase/steroid DELTA5,4-isomerase, 3betaHSD, 3betaHSD1, 3betaHSD2, 5-ene-3-beta-hydroxysteroid dehydrogenase, 5alpha-dihydrotestosterone 3beta-hydroxysteroid dehydrogenase, dehydrogenase, 3beta-hydroxy-DELTA5-steroid, DELTA5-3beta-hydroxysteroid dehydrogenase, DHRS4, HSD2, HSD3B, HSD3B1, HSD3B2, Hsd3b6, HSDB1, HSDH, More, progesterone reductase, Sl3betaHSD1, Solyc01g73640, 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
6.5 - 10
pH 6.5: about 55% of maximal activity, pH 10.0: about 45% of maximal activity
6.8 - 9
-
-
7.4
52% of maximal activity
7.4 - 9.7
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