Literature summary for 2.4.1.21 extracted from

Nakamura, Y.; Francisco, P.B., Jr.; Hosaka, Y.; Sato, A.; Sawada, T.; Kubo, A.; Fujita, N.
Essential amino acids of starch synthase IIa differentiate amylopectin structure and starch quality between japonica and indica rice varieties (2005), Plant Mol. Biol., 58, 213-227.

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Cloned(Commentary)

Cloned (Comment)	Organism
cloning and sequencing of cDNA encoding SSIIa of japonica and indica rice cultivars, expression in Escherichia coli	Oryza sativa

Natural Substrates/ Products (Substrates)

Natural Substrates	Organism	Comment (Nat. Sub.)	Natural Products	Comment (Nat. Pro.)	Rev.	Reac.
additional information	Oryza sativa	the activity of starch synthase IIa determines the type of amylopectin structure of rice starch to be either the typical indica-type or japonica-type, by playing a specific role in the synthesis of the long B1 chains by elongating short A and B1 chains, notwithstanding the presence of functional two additional SSII genes, a single SSI gene, two SSIII genes, and two SSIV genes in the rice plants. Val737 and Leu781 are essential not only for the optimal SSII1 activity, but also for the capacity to synthesize indica-type amylopectin	?	-	?

Organism

Organism	UniProt	Comment	Textmining
Oryza sativa	-	japonica and indica varieties	-

Purification (Commentary)

Purification (Comment)	Organism
-	Oryza sativa

Substrates and Products (Substrate)

Substrates	Comment Substrates	Organism	Products	Comment (Products)	Rev.	Reac.
additional information	the activity of starch synthase IIa determines the type of amylopectin structure of rice starch to be either the typical indica-type or japonica-type, by playing a specific role in the synthesis of the long B1 chains by elongating short A and B1 chains, notwithstanding the presence of functional two additional SSII genes, a single SSI gene, two SSIII genes, and two SSIV genes in the rice plants. Val737 and Leu781 are essential not only for the optimal SSII1 activity, but also for the capacity to synthesize indica-type amylopectin	Oryza sativa	?	-	?

Synonyms

Synonyms	Comment	Organism
SSIIa	-	Oryza sativa
starch synthase IIa	-	Oryza sativa

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Release 2023.1 (January 2023)