Literature summary for 2.4.1.21 extracted from

Imparl-Radosevich, J.M.; Nichols, D.J.; Li, P.; McKean, A.L.; Keeling, P.L.; Guan, H.
Analysis of purified maize starch synthases IIa and IIb: SS isoforms can be distinguished based on their kinetic properties (1999), Arch. Biochem. Biophys., 362, 131-138.

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Cloned(Commentary)

Cloned (Comment)	Organism
expression of full length and truncated starch synthase IIa and IIb in Escherichia coli	Zea mays

KM Value [mM]

KM Value [mM]	KM Value Maximum [mM]	Substrate	Comment	Organism	Structure
additional information	-	additional information	recombinant starch synthase IIa, amylopectin: 0.16 mg/ml, glycogen: 0.14 mg/ml, recombinant starch synthase IIb, amylopectin: 0.32 mg/ml, glycogen: 0.34 mg/ml	Zea mays
0.11	-	ADPglucose	recombinant starch synthase IIa	Zea mays
0.12	-	ADPglucose	recombinant starch synthase IIb	Zea mays

Organism

Organism	UniProt	Comment	Textmining
Zea mays	-	starch synthases IIa and IIb	-

Temperature Optimum [°C]

Temperature Optimum [°C]	Temperature Optimum Maximum [°C]	Comment	Organism
40	-	starch synthase IIb, in the presence of 500 mM citrate	Zea mays
45	-	starch synthase IIa, in the presence of 500 mM citrate	Zea mays

pH Optimum

pH Optimum Minimum	pH Optimum Maximum	Comment	Organism
7	10.3	starch synthases IIa and Iib, sharp decline in activity below pH 7.0	Zea mays

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Release 2023.1 (January 2023)