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Literature summary extracted from
- Crystal structures of human Delta4-3-ketosteroid 5beta-reductase (AKR1D1) reveal the presence of an alternative binding site responsible for substrate inhibition (2008), Biochemistry, 47, 13537-13546.
Cloned(Commentary)
| EC Number | Cloned (Comment) | Organism |
|---|---|---|
| 1.3.1.3 | expression of GST-tagged enzyme in Escherichia coli | Homo sapiens |
Crystallization (Commentary)
| EC Number | Crystallization (Comment) | Organism |
|---|---|---|
| 1.3.1.3 | purifed recombinant h5beta-red in ternary complex with NADPH and androstenedione, hanging-drop vapor diffusion technique, 2:1 v/v ratio of protein and well solution, about 5 days, X-ray diffraction structure determination and analysis at 2.0-2.3 A resolution | Homo sapiens |
Protein Variants
| EC Number | Protein Variants | Comment | Organism |
|---|---|---|---|
| 1.3.1.3 | V309F | replacement of one of the residues delineating this site by a phenylalanine completely abolishes the enzyme's substrate inhibition, but the catalytic efficiency of the mutated enzyme is similar to that of the wild-type h5beta-red enzyme | Homo sapiens |
| 1.3.1.3 | Y132F | replacement of one of the residues delineating this site by a phenylalanine completely abolishes the enzyme's substrate inhibition, but the catalytic efficiency of the mutated enzyme is similar to that of the wild-type h5beta-red enzyme | Homo sapiens |
Inhibitors
| EC Number | Inhibitors | Comment | Organism | Structure |
|---|---|---|---|---|
| 1.3.1.3 | androstenedione | the enzyme is rapidly inhibited by the substrate once its concentration reaches 2times the Km value. Androstenedione completely impedes the passage of another substrate molecule toward the catalytic site | Homo sapiens |  |
| 1.3.1.3 | additional information | structural features of substrate inhibition of h5beta-red by C19- and C21-steroids, overview | Homo sapiens | |
| 1.3.1.3 | progesterone | the enzyme is rapidly inhibited by the substrate once its concentration reaches 2times the Km value | Homo sapiens | |
KM Value [mM]
| EC Number | KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|---|
| 1.3.1.3 | additional information | - |
additional information | Michaelis-Menten kinetics for the reduction of androstenedione, overview | Homo sapiens | |
| 1.3.1.3 | 0.00037 | - |
androstenedione | pH 7.4, 37°C, wild-type enzyme | Homo sapiens | |
| 1.3.1.3 | 0.00094 | - |
androstenedione | pH 7.4, 37°C, mutant Y132F | Homo sapiens | |
| 1.3.1.3 | 0.01629 | - |
androstenedione | pH 7.4, 37°C, mutant V309F | Homo sapiens | |
Organism
| EC Number | Organism | UniProt | Comment | Textmining |
|---|---|---|---|---|
| 1.3.1.3 | Homo sapiens | P51857 | - |
- |
Purification (Commentary)
| EC Number | Purification (Comment) | Organism |
|---|---|---|
| 1.3.1.3 | recombinant GST-tagged enzyme from Escherichia coli by glutathione affinity and anion exchange chromatography, and gel filtration | Homo sapiens |
Substrates and Products (Substrate)
| EC Number | Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 1.3.1.3 | 7alpha,12alpha-dihydroxy-4-cholesten-3-one + NADPH + H+ | - |
Homo sapiens | ? | - |
? | |
| 1.3.1.3 | 7alpha-hydroxy-4-cholesten-3-one + NADPH + H+ | - |
Homo sapiens | ? | - |
? | |
| 1.3.1.3 | androstenedione + NADPH + H+ | - |
Homo sapiens | ? | - |
? | |
| 1.3.1.3 | additional information | the large steroid-binding site of this enzyme also contains a subsite in which the androstenedione molecule is bound, steroid-binding cavity structure of h5 beta-red, structure comparison | Homo sapiens | ? | - |
? | |
| 1.3.1.3 | progesterone + NADPH + H+ | - |
Homo sapiens | ? | - |
? | |
Subunits
| EC Number | Subunits | Comment | Organism |
|---|---|---|---|
| 1.3.1.3 | More | steroid-binding cavity structure of h5 beta-red, structure comparison | Homo sapiens |
Synonyms
| EC Number | Synonyms | Comment | Organism |
|---|---|---|---|
| 1.3.1.3 | AKR1D1 | - |
Homo sapiens |
| 1.3.1.3 | DELTA4-3-ketosteroid 5beta-reductase | - |
Homo sapiens |
| 1.3.1.3 | h5beta-red | - |
Homo sapiens |
| 1.3.1.3 | h5beta-reductase | - |
Homo sapiens |
| 1.3.1.3 | More | human 5beta-red belongs to the aldo-keto reductase, AKR, superfamily and is the first member of the 1D subfamily, AKR1D1 | Homo sapiens |
Temperature Optimum [°C]
| EC Number | Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|---|
| 1.3.1.3 | 37 | - |
assay at | Homo sapiens |
Turnover Number [1/s]
| EC Number | Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|---|
| 1.3.1.3 | 0.013 | - |
androstenedione | pH 7.4, 37°C, wild-type enzyme | Homo sapiens | |
| 1.3.1.3 | 0.0405 | - |
androstenedione | pH 7.4, 37°C, mutant Y132F | Homo sapiens | |
| 1.3.1.3 | 0.0425 | - |
androstenedione | pH 7.4, 37°C, mutant V309F | Homo sapiens | |
pH Optimum
| EC Number | pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|---|
| 1.3.1.3 | 7.3 | - |
assay at | Homo sapiens |
Cofactor
| EC Number | Cofactor | Comment | Organism | Structure |
|---|---|---|---|---|
| 1.3.1.3 | NADPH | - |
Homo sapiens | |
kcat/KM [mM/s]
| EC Number | kcat/KM Value [1/mMs-1] | kcat/KM Value Maximum [1/mMs-1] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|---|
| 1.3.1.3 | 2.609 | - |
androstenedione | pH 7.4, 37°C, mutant V309F | Homo sapiens | |
| 1.3.1.3 | 35.13 | - |
androstenedione | pH 7.4, 37°C, wild-type enzyme | Homo sapiens | |
| 1.3.1.3 | 43.08 | - |
androstenedione | pH 7.4, 37°C, mutant Y132F | Homo sapiens | |
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