KEGG   ENZYME: 2.4.1.242Help
Entry
EC 2.4.1.242                Enzyme                                 

Name
NDP-glucose---starch glucosyltransferase;
granule-bound starch synthase;
starch synthase II (ambiguous);
waxy protein;
starch granule-bound nucleoside diphosphate glucose-starch glucosyltransferase;
granule-bound starch synthase I;
GBSSI;
granule-bound starch synthase II;
GBSSII;
GBSS;
NDPglucose-starch glucosyltransferase
Class
Transferases;
Glycosyltransferases;
Hexosyltransferases
BRITE hierarchy
Sysname
NDP-glucose:(1->4)-alpha-D-glucan 4-alpha-D-glucosyltransferase
Reaction(IUBMB)
NDP-glucose + [(1->4)-alpha-D-glucosyl]n = NDP + [(1->4)-alpha-D-glucosyl]n+1 [RN:R07261]
Reaction(KEGG)
Substrate
NDP-glucose [CPD:C15541];
[(1->4)-alpha-D-glucosyl]n
Product
NDP [CPD:C00454];
[(1->4)-alpha-D-glucosyl]n+1
Comment
Unlike EC 2.4.1.11, glycogen(starch) synthase and EC 2.4.1.21, starch synthase, 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 [3] or pollen [5].
History
EC 2.4.1.242 created 2005
Orthology
K13679  
granule-bound starch synthase
Genes
ATH: 
ALY: 
CRB: 
EUS: 
CIT: 
CIC: 
TCC: 
GMX: 
PVU: 
CAM: 
FVE: 
PPER: 
CSV: 
RCU: 
POP: 
POPTR_0001s45360g(POPTRDRAFT_815839) POPTR_0011s15540g(POPTRDRAFT_569276)
VVI: 
SLY: 
SOT: 
102577459(GBSS)
OSA: 
DOSA: 
Os06t0133000-01(Os06g0133000) Os07t0412100-01(Os07g0412100)
OBR: 
BDI: 
SBI: 
SORBI_02g009870(SORBIDRAFT_02g009870) SORBI_10g002140(SORBIDRAFT_10g002140)
ZMA: 
100125638(GBSSIIa) 101027247 541854(wx1)
SITA: 
ATR: 
s00100p00051890(AMTR_s00100p00051890)
SMO: 
PPP: 
CRE: 
VCN: 
OLU: 
OTA: 
MIS: 
MPP: 
BPG: 
CSL: 
CVR: 
GTT: 
 » show all
Taxonomy
Reference
1  [PMID:4824506]
  Authors
Tsai CY.
  Title
The function of the waxy locus in starch synthesis in maize endosperm.
  Journal
Biochem. Genet. 11 (1974) 83-96.
  Organism
Zea mays
Reference
2  [PMID:9765530]
  Authors
Nakamura T, Vrinten P, Hayakawa K, Ikeda J.
  Title
Characterization of a granule-bound starch synthase isoform found in the pericarp of wheat.
  Journal
Plant. Physiol. 118 (1998) 451-9.
  Organism
Triticum aestivum
Reference
3  [PMID:9951718]
  Authors
Fujita N, Taira T.
  Title
A 56-kDa protein is a novel granule-bound starch synthase existing in the pericarps, aleurone layers, and embryos of immature seed in diploid wheat (Triticum monococcum L.).
  Journal
Planta. 207 (1998) 125-32.
  Organism
Triticum monococcum
Reference
4  [PMID:10393240]
  Authors
Murai J, Taira T, Ohta D.
  Title
Isolation and characterization of the three Waxy genes encoding the granule-bound starch synthase in hexaploid wheat.
  Journal
Gene. 234 (1999) 71-9.
  Organism
Triticum aestivum
Reference
5  [PMID:17248421]
  Authors
Nelson OE.
  Title
The WAXY Locus in Maize. II. the Location of the Controlling Element Alleles.
  Journal
Genetics. 60 (1968) 507-524.
  Organism
Zea mays
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 
CAS: 
9031-53-2

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