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2.4.1.242: NDP-glucose-starch glucosyltransferase

This is an abbreviated version!
For detailed information about NDP-glucose-starch glucosyltransferase, go to the full flat file.

Word Map on EC 2.4.1.242

Reaction

NDP-glucose
+
[(1->4)-alpha-D-glucosyl]n
=
NDP
 +
[(1->4)-alpha-D-glucosyl]n+1

Synonyms

GBSS, GBSS I, GBSS1, GBSS2, GBSS3, GBSSI, GBSSIa, GBSSIb, GBSSII, GBSSII-1, granule bound starch synthase, granule bound starch synthase I, granule-bound SSIIa protein, granule-bound starch synthase, granule-bound starch synthase 1, granule-bound starch synthase I, granule-bound starch synthase I gene, granule-bound starch synthase Ia, granule-bound starch synthase Ib, granule-bound starch synthase II, More, NDP-glucose-starch glucosyltransferase, NDPglucose-starch glucosyltransferase, SGP-1, SSII, SSIIa protein, starch synthase II, starch synthase IIa, starch-granule-bound starch synthase, UDPGlc: starch synthase, Waxy, Waxy protein, Wx protein, Wx-7A, Wx-A1, Wx-B1, Wx-D1, Wx-D1 protein

ECTree

     2 Transferases
         2.4 Glycosyltransferases
             2.4.1 Hexosyltransferases
                2.4.1.242 NDP-glucose-starch glucosyltransferase

Expression

Expression on EC 2.4.1.242 - NDP-glucose-starch glucosyltransferase

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EXPRESSION
ORGANISM
UNIPROT
LITERATURE
analysis of 352 Vietnamese rice cultivars reveals a wide range of variation in apparent amylose content and the expression level of granule-bound starch synthase I. Alleles can be classified into seven groups that reflect differences in apparent amylose content. The very low and low apparent amylose content levels are tightly associated with a G to T in the first intron whereas intermediate and high amylose is associated with a T genotype at a single-nucleotide polymorphism in exon 10. The correlation between the combination of T genotype at single-nucleotide polymorphism in the first intron, C in exon 6, or C in exon 10 is predominant among low amylose rice varieties. The low amylose properties of Vietnamese local rice germplasm are attributable to spontaneous mutations at exons, and not at the splicing donor site
GBSS activities decline significantly at the late grain-filling stage under rainfed conditions
-
GBSS activity is highest 28 days after anthesis
-
maximal expression of granule-bound starch synthase occurs in mid-stage of endosperm development, GBSS activity of Wanjing 9522 grains increases after anthesis and reaches ist maximal activity at day 18 and keeps this high level for about 6 days, and then decreases steadily
-
the GBSS activity in grains of two kernel types shows a similar pattern throughout the filling period, i.e. reaches the highest peak at 28 days after anthesis and then decreases rapidly
-
the starch associated SSIIa protein content is negatively correlated with the fraction of chains with DP6-11 and short chain ratio
-
the starch associated SSIIa protein content is positively correlated with gelatinization temperature and level of amylopectin chains with degree of polymerization 12-24
-
the transcript encoding granule-bound starch synthase GBSS1 accumulates to a higher level in carbon catabolite repressor CCR4a/CCR4b double mutant plants than in the control plants. GBSS1 has a longer poly(A) tail in the double mutant than in the control plant, suggesting that CCR4a and CCR4b can influence the poly(A) length of transcripts related to starch metabolism