137063-37-7Relevant articles and documents
Pseudoglycosyltransferase catalyzes nonglycosidic C-N coupling in validamycin a biosynthesis
Asamizu, Shumpei,Yang, Jongtae,Almabruk, Khaled H.,Mahmud, Taifo
, p. 12124 - 12135 (2011/10/09)
Glycosyltransferases are ubiquitous in nature. They catalyze a glycosidic bond formation between sugar donors and sugar or nonsugar acceptors to produce oligo/polysaccharides, glycoproteins, glycolipids, glycosylated natural products, and other sugar-containing entities. However, a trehalose 6-phosphate synthase-like protein has been found to catalyze an unprecedented nonglycosidic C-N bond formation in the biosynthesis of the aminocyclitol antibiotic validamycin A. This dedicated 'pseudoglycosyltransferase catalyzes a condensation between GDP-valienol and validamine 7-phosphate to give validoxylamine A 7′-phosphate with net retention of the 'anomeric configuration of the donor cyclitol in the product. The enzyme operates in sequence with a phosphatase, which dephosphorylates validoxylamine A 7′-phosphate to validoxylamine A.
Synthetic Studies on Antiobiotic Validamycins. Part 14. Total Syntheses of (+)-Validamycins C, D and F
Miyamoto, Yasunobu,Ogawa, Seiichiro
, p. 2121 - 2128 (2007/10/02)
(+)-Validamycins C and F were first completely synthesised by use of a common blocked derivative 5 of (+)-validoxylamine A.The diols 6 and 7, obtained by acid hydrolysis of 5, were appropriately protected to give the aglycones 17, 25 and 30, which were co