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Literature summary for 1.8.3.2 extracted from
- Augmenter of liver regeneration: a flavin-dependent sulfhydryl oxidase with cytochrome c reductase activity (2005), Biochemistry, 44, 1532-1541.
Cloned(Commentary)
| Cloned (Comment) | Organism |
|---|---|
| overexpression of wild-type and mutant liver enzymes in Escherichia coli strain BL21(DE3) with a longer or shorter linker His-tag, overview | Homo sapiens |
Protein Variants
| Protein Variants | Comment | Organism |
|---|---|---|
| C124A | site-directed mutagenesis, slightly reduced activity compared to the wild-type enzyme | Homo sapiens |
| C15A | site-directed mutagenesis, increased activity compared to the wild-type enzyme | Homo sapiens |
| C15A/C124A | site-directed mutagenesis, decreased activity compared to the wild-type enzyme | Homo sapiens |
| C15A/C74A/C85A/C124A | site-directed mutagenesis, increased activity compared to the wild-type enzyme | Homo sapiens |
| C74A/C85A | site-directed mutagenesis, decreased activity compared to the wild-type enzyme | Homo sapiens |
KM Value [mM]
| KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|
| additional information | - |
additional information | redox potential of wild-type and mutant enzymes | Homo sapiens | |
| 1.3 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutant C15A | Homo sapiens |  |
| 1.7 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutant C15A/C74A/C85A/C124A | Homo sapiens | |
| 1.8 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutant C124A | Homo sapiens | |
| 2 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutants C74A/C85A and C15A/C124A | Homo sapiens | |
| 2.1 | - |
dithiothreitol | pH 7.5, 25°C, recombinant wild-type enzyme | Homo sapiens | |
Natural Substrates/ Products (Substrates)
| Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| additional information | Homo sapiens | enzyme might communicate with the respiratory chain via the mediation of cytochrome c | ? | - |
? | |
| R-SH + O2 | Homo sapiens | - |
R-S-S-R + H2O2 | - |
ir | |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Homo sapiens | - |
- |
- |
Purification (Commentary)
| Purification (Comment) | Organism |
|---|---|
| recombinant His-tagged wild-type and mutant liver enzymes from Escherichia coli strain BL21(DE3) | Homo sapiens |
Source Tissue
| Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|
| liver | - |
Homo sapiens | - |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| dithiothreitol + O2 | the enzyme forms large amounts of neutral semiquinone, which arises between flavin centers within the dimer, during aerobic turnover with DTT | Homo sapiens | dithiothreitol disulfide + H2O2 | - |
ir | |
| dithiothreitol + reduced cytochrome c | cytochrome c is about 100fold more effective than O2 as reducing cosubstrate | Homo sapiens | dithiothreitol disulfide + oxidized cytochrome c | - |
? | |
| additional information | enzyme might communicate with the respiratory chain via the mediation of cytochrome c | Homo sapiens | ? | - |
? | |
| R-SH + O2 | - |
Homo sapiens | R-S-S-R + H2O2 | - |
ir | |
| R-SH + O2 | disulfide bridge C15-C124 is not required for activity | Homo sapiens | R-S-S-R + H2O2 | - |
ir | |
Subunits
| Subunits | Comment | Organism |
|---|---|---|
| dimer | monomers are linked via a disulfide bridge C15-C124, which is not critical for dimer formation, structure modeling using the enzymes crystal structure | Homo sapiens |
Synonyms
| Synonyms | Comment | Organism |
|---|---|---|
| ALR | augmenter of liver regeneration | Homo sapiens |
| hepatopoietin | - |
Homo sapiens |
| More | enzyme belongs to the sulfhydryl oxidase/Quiescin Q6 family | Homo sapiens |
| QSOX | - |
Homo sapiens |
| quiescin-like flavin-dependent sulfhydryl oxidase | - |
Homo sapiens |
| sulfhydryl oxidase | - |
Homo sapiens |
Temperature Optimum [°C]
| Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|
| 25 | - |
assay at | Homo sapiens |
Turnover Number [1/s]
| Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|
| 0.83 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutant C74A/C85A | Homo sapiens | |
| 0.87 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutant C15A | Homo sapiens | |
| 0.9 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutant C124A | Homo sapiens | |
| 0.95 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutant C15A/C124A | Homo sapiens | |
| 1.1 | - |
dithiothreitol | pH 7.5, 25°C, recombinant wild-type enzyme | Homo sapiens | |
| 1.25 | - |
dithiothreitol | pH 7.5, 25°C, recombinant mutant C15A/C74A/C85A/C124A | Homo sapiens | |
pH Optimum
| pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|
| 7.5 | - |
assay at | Homo sapiens |
Cofactor
| Cofactor | Comment | Organism | Structure |
|---|---|---|---|
| FAD | dependent on | Homo sapiens | |
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