ENZYME entry: EC 2.4.1.242

Accepted Name
NDP-glucose--starch glucosyltransferase.
Alternative Name(s)
GBSS.
GBSSI.
GBSSII.
Granule-bound starch synthase.
Granule-bound starch synthase I.
Granule-bound starch synthase II.
NDPglucose-starch glucosyltransferase.
Starch granule-bound nucleoside diphosphate glucose-starch glucosyltransferase.
Starch synthase II.
Waxy protein.
Reaction catalysed
NDP-glucose + (1,4-alpha-D-glucosyl)(n) <=> NDP + (1,4-alpha-D-glucosyl)(n+1)
Comment(s)
  • Unlike EC 2.4.1.11 and EC 2.4.1.21 which use UDP-glucose and ADP- glucose, respectively, this enzyme can use either UDP- or ADP- glucose.
  • Mutants that lack the Wx (waxy) allele cannot produce this enzyme, which plays an important role in the normal synthesis of amylose.
  • In such mutants, only amylopectin is produced in the endosperm or pollen.
Cross-references
BRENDA2.4.1.242
EC2PDB2.4.1.242
ExplorEnz2.4.1.242
PRIAM enzyme-specific profiles2.4.1.242
KEGG Ligand Database for Enzyme Nomenclature2.4.1.242
IUBMB Enzyme Nomenclature2.4.1.242
IntEnz2.4.1.242
MEDLINEFind literature relating to 2.4.1.242
MetaCyc2.4.1.242
UniProtKB/Swiss-Prot
Q8LL05, SSG1B_HORVU;  P84766, SSG1_AEGTS;  Q9MAQ0, SSG1_ARATH;  
P84633, SSG1_FAGES;  P09842, SSG1_HORVU;  Q42857, SSG1_IPOBA;  
P04713, SSG1_MAIZE;  Q43784, SSG1_MANES;  Q42968, SSG1_ORYGL;  
P0C585, SSG1_ORYSA;  A2Y8X2, SSG1_ORYSI;  Q0DEV5, SSG1_ORYSJ;  
Q43092, SSG1_PEA;  P84765, SSG1_SECCE;  Q00775, SSG1_SOLTU;  
Q43134, SSG1_SORBI;  P27736, SSG1_WHEAT;  

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All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.4.1.-
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