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ENZYME

ENZYME entry: EC 2.4.1.242

PURL: https://purl.expasy.org/enzyme/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
an NDP-alpha-D-glucose + [(1->4)-alpha-D-glucosyl](n) = [(1->4)-alpha-D-glucosyl](n+1) + a ribonucleoside 5'-diphosphate + H(+)
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
KEGG Ligand Database for Enzyme Nomenclature2.4.1.242
IUBMB Enzyme Nomenclature2.4.1.242
MEDLINEFind literature relating to 2.4.1.242
MetaCyc2.4.1.242
Rhea expert-curated reactions2.4.1.242
UniProtKB/Swiss-Prot
Q8LL05, SSG1B_HORVUP84766, SSG1_AEGTSQ9MAQ0, SSG1_ARATH
P84633, SSG1_FAGESP09842, SSG1_HORVUQ42857, SSG1_IPOBA
P04713, SSG1_MAIZEQ43784, SSG1_MANESQ42968, SSG1_ORYGL
P0C585, SSG1_ORYSAA2Y8X2, SSG1_ORYSIQ0DEV5, SSG1_ORYSJ
Q43092, SSG1_PEAP84765, SSG1_SECCEQ00775, SSG1_SOLTU
Q43134, SSG1_SORBIP27736, SSG1_WHEAT

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All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.4.1.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.4.-.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.-.-.-