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Literature summary for 2.4.1.14 extracted from
- Rice sucrose-phosphate synthase: identification of an isoform specific for heterotrophic tissues with distinct metabolite regulation from the mature leaf enzyme (2000), Physiol. Plant., 108, 337-344.
No PubMed abstract available
Activating Compound
| Activating Compound | Comment | Organism | Structure |
|---|---|---|---|
| glucose-6-phosphate | SPS-I and SPS-II | Oryza sativa |  |
General Stability
| General Stability | Organism |
|---|---|
| SPS-I loses more activity during purification than SPS-II | Oryza sativa |
Inhibitors
| Inhibitors | Comment | Organism | Structure |
|---|---|---|---|
| phosphate | SPS-I shows high sensitivity towards phosphate, whereas SPS-II is only slightly sensitive | Oryza sativa | |
KM Value [mM]
| KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|
| 3.5 | - |
D-fructose 6-phosphate | SPS-I | Oryza sativa | |
| 3.6 | - |
UDP-glucose | SPS-I | Oryza sativa | |
| 4.1 | - |
D-fructose 6-phosphate | SPS-II | Oryza sativa | |
| 4.2 | - |
UDP-glucose | SPS-II | Oryza sativa | |
Molecular Weight [Da]
| Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
|---|---|---|---|
| 116000 | - |
SDS-PAGE, minor 88000 Da band detected, that is suggested to be a degradation product | Oryza sativa |
Natural Substrates/ Products (Substrates)
| Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| UDP-alpha-D-glucose + D-fructose 6-phosphate | Oryza sativa | catalyzes the penultimate step of sucrose synthesis | UDP + sucrose 6-phosphate | - |
? | |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Oryza sativa | - |
- |
- |
Purification (Commentary)
| Purification (Comment) | Organism |
|---|---|
| partial, two forms of the enzyme identified, SPS-I loses more activity during purification than SPS-II | Oryza sativa |
Source Tissue
| Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|
| leaf | - |
Oryza sativa | - |
| seed | germinated | Oryza sativa | - |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| UDP-alpha-D-glucose + D-fructose 6-phosphate | - |
Oryza sativa | UDP + sucrose 6-phosphate | - |
? | |
| UDP-alpha-D-glucose + D-fructose 6-phosphate | catalyzes the penultimate step of sucrose synthesis | Oryza sativa | UDP + sucrose 6-phosphate | - |
? | |
Synonyms
| Synonyms | Comment | Organism |
|---|---|---|
| More | two forms of enzyme identified, that differ in regulatory properties | Oryza sativa |
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