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Literature summary extracted from

  • Seung, D.; Lu, K.J.; Stettler, M.; Streb, S.; Zeeman, S.C.
    Degradation of glucan primers in the absence of starch synthase 4 disrupts starch granule initiation in Arabidopsis (2016), J. Biol. Chem., 291, 20718-20728 .
    View publication on PubMedView publication on EuropePMC

Localization

EC Number Localization Comment Organism GeneOntology No. Textmining
2.4.1.21 chloroplast
-
 Arabidopsis thaliana 9507
-

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 Arabidopsis thaliana
-
 ADP + [(1->4)-alpha-D-glucosyl]n+1
-
 ?

Organism

EC Number Organism UniProt Comment Textmining
2.4.1.21 Arabidopsis thaliana
-
-
-

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2.4.1.21 ADP-alpha-D-glucose + [(1->4)-alpha-D-glucosyl]n
-
 Arabidopsis thaliana ADP + [(1->4)-alpha-D-glucosyl]n+1
-
 ?

Synonyms

EC Number Synonyms Comment Organism
2.4.1.21 SS4
-
 Arabidopsis thaliana
2.4.1.21 starch synthase 4
-
 Arabidopsis thaliana

General Information

EC Number General Information Comment Organism
2.4.1.21 malfunction a mutant lacking starch synthase 4 is impaired in its ability to initiate starch granules, its chloroplasts rarely contain more than one large granule, and the plants have a pale appearance and reduced growth. The chloroplastic alpha-amylase AMY3 abundance is reduced in mutants lacking starch synthase 3 and/or 4 Arabidopsis thaliana
2.4.1.21 metabolism the enzyme plays a key role in granule initiation, allowing it to proceed in a way that avoids premature degradation of primers by starch hydrolases, such as the chloroplastic alpha-amylase AMY3 Arabidopsis thaliana