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Literature summary for 2.2.1.6 extracted from
- Separation and characterization of two forms of acetohydroxy acid synthase from black mexican sweet corn cells (1988), J. Chromatogr., 444, 251-261.
No PubMed abstract available
Inhibitors
| Inhibitors | Comment | Organism | Structure |
|---|---|---|---|
| Ile | enzyme form AHS I is inhibited. Enzyme form AHS II is not inhibited | Zea mays |  |
| imazapyr | enzyme form AHS I and AHS II | Zea mays | |
| Leu | enzyme form AHS I is inhibited. Enzyme form AHS II is not inhibited | Zea mays | |
| sulfometuron-methyl | enzyme form AHS I and AHS II | Zea mays | |
| Val | enzyme form AHS I is inhibited. Enzyme form AHS II is not inhibited | Zea mays | |
KM Value [mM]
| KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|
| 5 | - |
pyruvate | AHAS I | Zea mays | |
| 8 | - |
pyruvate | AHAS II | Zea mays | |
Molecular Weight [Da]
| Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
|---|---|---|---|
| 55000 | - |
AHAS II, gel filtration | Zea mays |
| 193000 | - |
AHAS I, gel filtration | Zea mays |
Natural Substrates/ Products (Substrates)
| Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| pyruvate | Zea mays | first enzyme unique to biosynthesis of the branched chain amino acids Val, Leu, and Ile | ? | - |
? | |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Zea mays | - |
black mexican sweet, two enzyme forms: AHAS I and AHAS II | - |
Source Tissue
| Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|
| cell suspension culture | - |
Zea mays | - |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| pyruvate | - |
Zea mays | 2-acetolactate + CO2 | - |
? | |
| pyruvate | first enzyme unique to biosynthesis of the branched chain amino acids Val, Leu, and Ile | Zea mays | ? | - |
? | |
pH Optimum
| pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|
| 6 | 7 | AHAS I | Zea mays |
| 7 | - |
AHAS II | Zea mays |
pH Range
| pH Minimum | pH Maximum | Comment | Organism |
|---|---|---|---|
| 5.5 | 8 | pH 5.5: about 80% of maximal activity, pH 8.0: about 55% of maximal activity, AHAS I | Zea mays |
| 6.5 | 7.5 | about 60% of maximal activity at pH 6.5 and pH 7.5, AHAS II | Zea mays |
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