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Literature summary for 2.4.1.242 extracted from

  • Liu, D.R.; Huang, W.X.; Cai, X.L.
    Oligomerization of rice granule-bound starch synthase 1 modulates its activity regulation (2013), Plant Sci., 210, 141-150.
    View publication on PubMed
Search for more literature for 2.4.1.242

Cloned(Commentary)

Cloned (Comment) Organism
expression in Escherichia coli Oryza sativa

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.027
-
 ADP-glucose enzyme oligomer, pH not specified in the publication, temperature not specified in the publication Oryza sativa
0.03
-
 ADP-glucose enzyme monomer, pH not specified in the publication, temperature not specified in the publication Oryza sativa

Organism

Organism UniProt Comment Textmining
Oryza sativa
-
-
-
Oryza sativa Zh11
-
-
-

Posttranslational Modification

Posttranslational Modification Comment Organism
phosphoprotein phosphorylation status is strongly enhanced by mitogen-activated protein kinase MAPK and ATP treatment and is sharply weakened by protein phosphatase treatment Oryza sativa

Source Tissue

Source Tissue Comment Organism Textmining
endosperm
-
 Oryza sativa
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
ADP-glucose + (1,4-alpha-D-glucosyl)n
-
 Oryza sativa ADP + (1,4-alpha-D-glucosyl)n+1
-
 ?
ADP-glucose + (1,4-alpha-D-glucosyl)n
-
 Oryza sativa Zh11 ADP + (1,4-alpha-D-glucosyl)n+1
-
 ?

Subunits

Subunits Comment Organism
monomer and oligomer, gel filtration and SDS-PAGE Oryza sativa
oligomer and monomer, gel filtration and SDS-PAGE Oryza sativa

General Information

General Information Comment Organism
physiological function GBSS1 can form oligomers in rice endosperm, and oligomerized OsGBSS1 exhibits much higher specific enzymatic activity than the monomer. A monomer-oligomer transition equilibrium occurs in the endosperm during development. Redox potential is a key factor affecting the oligomer percentage as well as the enzymatic activity. Adenosine diphosphate glucose, the direct donor of glucose, also impacts GBSS1 oligomerization in a concentration-dependent manner. GBSS1 oligomerization is influenced by phosphorylation status, which is strongly enhanced by mitogen-activated protein kinase MAPK and ATP treatment and is sharply weakened by protein phosphatase treatment Oryza sativa