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Literature summary extracted from

  • Nakamura, T.; Vrinten, P.; Hayakawa, K.; Ikeda, J.
    Characterization of a granule-bound starch synthase isoform found in the pericarp of wheat (1998), Plant Physiol., 118, 451-459.
    View publication on PubMedView publication on EuropePMC

Molecular Weight [Da]

EC Number Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
2.4.1.242 59000
-
 x * 59000, isozyme GBSSII, SDS-PAGE, x * 61000, isozyme GBSSI, SDS-PAGE Triticum aestivum
2.4.1.242 61000
-
 x * 59000, isozyme GBSSII, SDS-PAGE, x * 61000, isozyme GBSSI, SDS-PAGE Triticum aestivum

Natural Substrates/ Products (Substrates)

EC Number Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
2.4.1.21 ADP-glucose + alpha-1,4-polyglucan Triticum aestivum involved in amylose synthesis in the pericarp ADP + alpha-1,4-polyglucan
-
 ?
2.4.1.242 ADP-glucose + (1,4-alpha-glucosyl)n Triticum aestivum
-
 ADP + (1,4-alpha-glucosyl)n+1
-
 ?
2.4.1.242 additional information Triticum aestivum isozyme GBSSII has an important function in amylose synthesis in the pericarp of seeds ?
-
 ?

Organism

EC Number Organism UniProt Comment Textmining
2.4.1.21 Triticum aestivum
-
-
-
2.4.1.242 Triticum aestivum
-
 cultivars Morikei CD-1479 and Chinese Spring, i.e. waxy wheat, 2 isozymes GBSSI, i.e. the waxy protein, and GBSSII
-

Source Tissue

EC Number Source Tissue Comment Organism Textmining
2.4.1.21 pericarp granule-bound starch synthase II Triticum aestivum
-
2.4.1.242 endosperm isozyme GBSSI Triticum aestivum
-
2.4.1.242 additional information tissue-specific expression of isozymes GBSSI and GBSSII in different organs Triticum aestivum
-
2.4.1.242 pericarp isozyme GBSSII Triticum aestivum
-
2.4.1.242 seed immature Triticum aestivum
-

Specific Activity [micromol/min/mg]

EC Number Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
2.4.1.242 0.00003
-
 endosperm Triticum aestivum
2.4.1.242 0.00032
-
 pericarp Triticum aestivum

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2.4.1.21 ADP-glucose + alpha-1,4-polyglucan involved in amylose synthesis in the pericarp Triticum aestivum ADP + alpha-1,4-polyglucan
-
 ?
2.4.1.242 ADP-glucose + (1,4-alpha-glucosyl)n
-
 Triticum aestivum ADP + (1,4-alpha-glucosyl)n+1
-
 ?
2.4.1.242 ADP-glucose + (1,4-alpha-glucosyl)n substrate for the granule-bound enzyme are starch granules Triticum aestivum ADP + (1,4-alpha-glucosyl)n+1
-
 ?
2.4.1.242 additional information isozyme GBSSII has an important function in amylose synthesis in the pericarp of seeds Triticum aestivum ?
-
 ?

Subunits

EC Number Subunits Comment Organism
2.4.1.242 ? x * 59000, isozyme GBSSII, SDS-PAGE, x * 61000, isozyme GBSSI, SDS-PAGE Triticum aestivum

Synonyms

EC Number Synonyms Comment Organism
2.4.1.242 GBSSI
-
 Triticum aestivum
2.4.1.242 GBSSII
-
 Triticum aestivum
2.4.1.242 granule-bound starch synthase I
-
 Triticum aestivum
2.4.1.242 granule-bound starch synthase II
-
 Triticum aestivum

Temperature Optimum [°C]

EC Number Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
2.4.1.242 25
-
 assay at Triticum aestivum

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
2.4.1.242 8.3
-
 assay at Triticum aestivum