Literature summary extracted from

Crofts, N.; Sugimoto, K.; Oitome, N.F.; Nakamura, Y.; Fujita, N.
Differences in specificity and compensatory functions among three major starch synthases determine the structure of amylopectin in rice endosperm (2017), Plant Mol. Biol., 94, 399-417 .

Natural Substrates/ Products (Substrates)

EC Number	Natural Substrates	Organism	Comment (Nat. Sub.)	Natural Products	Comment (Nat. Pro.)	Rev.	Reac.
2.4.1.21	ADP-alpha-D-glucose + [(1->4)-alpha-D-glucosyl]n	Oryza sativa	-	ADP + [(1->4)-alpha-D-glucosyl]n+1	-	?

Organism

EC Number	Organism	UniProt	Comment	Textmining
2.4.1.21	Oryza sativa	-	cultivars IR36 and Nipponbare	-

Source Tissue

EC Number	Source Tissue	Comment	Organism	Textmining
2.4.1.21	endosperm	-	Oryza sativa	-

Substrates and Products (Substrate)

EC Number	Substrates	Comment Substrates	Organism	Products	Comment (Products)	Rev.	Reac.
2.4.1.21	ADP-alpha-D-glucose + amylopectin	-	Oryza sativa	ADP + ?	-	?
2.4.1.21	ADP-alpha-D-glucose + [(1->4)-alpha-D-glucosyl]n	-	Oryza sativa	ADP + [(1->4)-alpha-D-glucosyl]n+1	-	?
2.4.1.21	additional information	isoform SSI cannot compensate for the function of isoform SSIIa and elongation of DP higher 30 by isoform SSIIIa	Oryza sativa	?	-	-
2.4.1.21	additional information	isoform SSIIa preferentially elongates outer but not inner chains of amylopectin. Isoform SSIIa can complement most isoform SSI functions that use glucan chains with DP 6-7 to generate DP 8-12 chains but cannot fully compensate for the elongation of DP 16-19 chains. Isoform SSIIa cannot compensate for elongation of DP higher 30 by isoform SSIIIa	Oryza sativa	?	-	-
2.4.1.21	additional information	isoform SSIIIa cannot compensate for the function of isoform SSIIa	Oryza sativa	?	-	-

Synonyms

EC Number	Synonyms	Comment	Organism
2.4.1.21	SSI	isoform	Oryza sativa
2.4.1.21	SSII(a)	isoform	Oryza sativa
2.4.1.21	SSIII(a)	isoform	Oryza sativa
2.4.1.21	starch synthase	-	Oryza sativa

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Release 2023.1 (January 2023)