EC Number |
Source Tissue |
Reference |
---|
3.2.1.68 | commercial preparation |
- |
710571, 731578 |
3.2.1.68 | endosperm |
- |
136814, 657126, 682469, 716495, 716600, 716622, 751948, 752159 |
3.2.1.68 | endosperm |
only ISA1, no ISA2 |
732655 |
3.2.1.68 | endosperm |
the ISA1 homomer does not provide the full physiological function of ISA activity in maize leaves. This is in contrast to the endosperm, where loss of ISA2, and thus the ISA1/ISA2 heteromeric enzyme, can be tolerated without major defects |
732581 |
3.2.1.68 | fruit |
- |
665267 |
3.2.1.68 | kernel |
- |
136814 |
3.2.1.68 | kernel |
developing |
657126 |
3.2.1.68 | leaf |
- |
-, 666637, 678801, 681140, 732655, 732750 |
3.2.1.68 | leaf |
ISA1 and ISA2 |
732655 |
3.2.1.68 | leaf |
three ISA activity forms are observed in leaves, two ISA1/ISA2 heteromultimers and one ISA1 homomultimer. ISA1 homomultimer activity exists in mutants lacking ISA2. Mutants without ISA2 differ in leaf starch content, granule morphology, and amylopectin structure compared with nonmutants or lines lacking both ISA1 and ISA2. The data imply that both the ISA1 homomultimer and ISA1/ISA2 heteromultimer function in the maize leaf. The ISA1 homomer does not provide the full physiological function of ISA activity in maize leaves. This is in contrast to the endosperm, where loss of ISA2, and thus the ISA1/ISA2 heteromeric enzyme, can be tolerated without major defects |
732581 |