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Literature summary extracted from

  • Szydlowski, N.; Ragel, P.; Hennen-Bierwagen, T.A.; Planchot, V.; Myers, A.M.; Merida, A.; dHulst, C.; Wattebled, F.
    Integrated functions among multiple starch synthases determine both amylopectin chain length and branch linkage location in Arabidopsis leaf starch (2011), J. Exp. Bot., 62, 4547-4559.
    View publication on PubMed

Protein Variants

EC Number Protein Variants Comment Organism
2.4.1.242 additional information construction of diverse soluble starch synthases ss mutants, with or without mutation of GBSS1, e.g. gbss1- ss2-double mutant and gbss1- ss1- ss2-triple mutant, waxy gene, phenotypes, overview Arabidopsis thaliana

Organism

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

Source Tissue

EC Number Source Tissue Comment Organism Textmining
2.4.1.21 leaf
-
 Arabidopsis thaliana
-
2.4.1.242 leaf
-
 Arabidopsis thaliana
-

Synonyms

EC Number Synonyms Comment Organism
2.4.1.242 GBSS1
-
 Arabidopsis thaliana
2.4.1.242 granule bound starch synthase
-
 Arabidopsis thaliana

General Information

EC Number General Information Comment Organism
2.4.1.21 physiological function construction of double mutant isoforms ss1- ss2- or ss1- ss3- lines using confirmed null mutations. Double mutant plants develop similarly to the wild type, although they accumulate less leaf starch in both short-day and long-day diurnal cycles. Lines containing only SS2 and SS4, or SS3 and SS4, are able to produce substantial amounts of starch granules. In both double mutants the residual starch is structurally modified including higher ratios of amylose to amylopectin, altered glucan chain length distribution within amylopectin, abnormal granule morphology, and altered placement of alpha(1-6) branch linkages relative to the reducing end of each linear chain. Starch Ssynthase activity affects not only chain elongation but also the net result of branch placement accomplished by the balanced activities of starch branching enzymes and starch debranching enzymes. Isoform SS3 partially overlaps in function with isoform SS1 for the generation of short glucan chains within amylopectin Arabidopsis thaliana
2.4.1.242 physiological function GBSS1 is the key enzyme in amylose synthesis and exclusively controls all enzyme activities in this pathway, overview. GBSS1 activity is increased compared to wild-type when soluble starch synthases SS2 and SS1 are missing, and the total amount of amylose in the leaves is elevated, SS1 and SS2 activity both can influence the activity of GBSS1 Arabidopsis thaliana