Biology:NDP-glucose—starch glucosyltransferase
| NDP-glucose-starch glucosyltransferase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 2.4.1.242 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
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In enzymology, a NDP-glucose—starch glucosyltransferase (EC 2.4.1.242) is an enzyme that catalyzes the chemical reaction
- NDP-glucose + (1,4-alpha-D-glucosyl)n [math]\displaystyle{ \rightleftharpoons }[/math] NDP + (1,4-alpha-D-glucosyl)n+1
Thus, the two substrates of this enzyme are NDP-glucose and (1,4-alpha-D-glucosyl)n, whereas its two products are NDP and (1,4-alpha-D-glucosyl)n+1.
This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is NDP-glucose:1,4-alpha-D-glucan 4-alpha-D-glucosyltransferase. Other names in common use include 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, and NDPglucose-starch glucosyltransferase.
References
- Tsai CY (1974). "The function of the waxy locus in starch synthesis in maize endosperm". Biochem. Genet. 11 (2): 83–96. doi:10.1007/BF00485766. PMID 4824506. http://ntur.lib.ntu.edu.tw/bitstream/246246/116315/1/909.pdf.
- "Characterization of a granule-bound starch synthase isoform found in the pericarp of wheat". Plant Physiol. 118 (2): 451–9. 1998. doi:10.1104/pp.118.2.451. PMID 9765530.
- "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.)". Planta 207 (1): 125–32. 1998. doi:10.1007/s004250050464. PMID 9951718.
- "Isolation and characterization of the three Waxy genes encoding the granule-bound starch synthase in hexaploid wheat". Gene 234 (1): 71–9. 1999. doi:10.1016/S0378-1119(99)00178-X. PMID 10393240.
- Nelson OE (1968). "The waxy locus in maize. II The location of the controlling element alleles". Genetics 60 (3): 507–524. doi:10.1093/genetics/60.3.507. PMID 17248421.
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