Cooperative action of beta-glucan synthetase and UDP-xylose xylosyl transferase of Golgi membranes in the synthesis of xyloglucan-like polysaccharide.
Golgi membranes of pea seedling tissue contain a UDP xylose:polysaccharide xylosyl transferase, the action of which is stimulated by UDP glucose. In the presence of both nucleotide-sugars a heteropolysaccharide containing both xylose and glucose (xyloglucan) is produced. Transfer of xylose and glucose units is presumed to be due to separate enzymes, because their properties differ in a number of respects. Xylosyl units appear to be transferred to a glucan core polysaccharide that is produced from UDP glucose by beta-1,4-glucan synthetase. This, rather than cellulose biosynthesis, is inferred to be the in vivo role of Golgi membrane beta-1,4-glucan synthetase.
D007887:Fabaceae / Q000378:metabolism; D005964:Glucosyltransferases / Q000378:metabolism*; D006056:Golgi Apparatus / Q000378:metabolism*; D010430:Pentosyltransferases / Q000378:metabolism*; D010946:Plants, Medicinal; D011134:Polysaccharides / Q000378:metabolism*; D013214:Starch Synthase / Q000378:metabolism*; D014532:Uridine Diphosphate Glucose / Q000378:metabolism; D014540:Uridine Diphosphate Xylose / Q000378:metabolism; D000097608:UDP Xylose-Protein Xylosyltransferase
D005964:Glucosyltransferases; D010430:Pentosyltransferases; D011134:Polysaccharides; D013214:Starch Synthase; D014532:Uridine Diphosphate Glucose; D014540:Uridine Diphosphate Xylose; D000097608:UDP Xylose-Protein Xylosyltransferase