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Literature summary extracted from
- Purification and characterization of soluble starch synthases from maize endosperm (2000), Arch. Biochem. Biophys., 373, 135-146.
KM Value [mM]
| EC Number | KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|---|
| 2.4.1.21 | additional information | - |
additional information | starch synthase I, amylopectin: 0.08 mg/ml in the presence of citrate, 0.13 mg/ml in the absence of citrate, glycogen: 0.043 mg/ml in the presence of citrate, 12.8 mg/ml in the absence of citrate | Zea mays | |
| 2.4.1.21 | 0.053 | - |
ADPglucose | starch synthase I, primer amylopectin | Zea mays |  |
| 2.4.1.21 | 0.11 | - |
ADPglucose | starch synthase I, primer amylopectin, 500 mM citrate | Zea mays | |
| 2.4.1.21 | 0.3 | - |
ADPglucose | starch synthase II, primer amylopectin, 500 mM citrate | Zea mays | |
Organism
| EC Number | Organism | UniProt | Comment | Textmining |
|---|---|---|---|---|
| 2.4.1.21 | Zea mays | - |
starch synthase II | - |
Purification (Commentary)
| EC Number | Purification (Comment) | Organism |
|---|---|---|
| 2.4.1.21 | starch synthases I and II, Q-Sepharose, Mono Q, amylose-agarose | Zea mays |
Source Tissue
| EC Number | Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|---|
| 2.4.1.21 | endosperm | starch synthase I and II | Zea mays | - |
Temperature Optimum [°C]
| EC Number | Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|---|
| 2.4.1.21 | 37 | - |
starch synthase II, 60% of maximal activity at 23°C | Zea mays |
| 2.4.1.21 | 42 | - |
starch synthase I, 15% of maximal activity at 23°C | Zea mays |
Temperature Stability [°C]
| EC Number | Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
|---|---|---|---|---|
| 2.4.1.21 | 42 | - |
starch synthase I, no loss of activity after 30 min, starch synthase II, loss of more than 50% activity after 30 min | Zea mays |
pH Optimum
| EC Number | pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|---|
| 2.4.1.21 | 7 | - |
starch synthase II, 75% of maximal activity at pH 6.5 | Zea mays |
| 2.4.1.21 | 8 | - |
starch synthase I, 34% of maximal activity at pH 6.5 | Zea mays |
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Release 2023.1 (January 2023)
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