By Margaret L. Vickery, Brian Vickery (auth.)
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Additional resources for Secondary Plant Metabolism
21). Thus, the reaction is a transglucosy1ation involving the breaking of a 1-+4 bond and the formation of a 1-+6 bond. There is evidence that the enzyme(s) cata1ysing the formation of 1-+4linkages of amylopectin may not be identical with the starch synthase of amylose. 19). P1ants contain an enzyme, a-amylase, which catalyses the random hydrolysis of 1-+4 1inkages, resulting in the breakdown of starches to short-chain polymers. 67), and amylopectin to a-limit dextrins. The number of units contained in an a-limit dextrin depends on the source of the enzyme.
C-glycosides are less common than O-glycosides and usually contain glucose. 50), a glucoside fust isolated from the roots of Mangifera indica (Anacardiaceae), but since found in plants belonging to many different families. 53), from Viola tricolor (Violaceae), which contains both glucose and rhamnose in C-glycoside linkages. 55)derivatives of purines arid pyrimidines which constitute the nucleosides and nucleotides. These are described in Chapter 10. 5 6). The purpose of these Nglycosides is unknown, as they do not form nuc1eic acids or coenzymes as do the ribose and deoxyribose derivatives.
It is the only sugar occurring in the S-glycosides known as glucosinolates (Chapter 8) and is the major sugar found in the cyanogenic glycosides (Chapter 8). 3) is a rare constituent of glycosides. g. g. 36» derivatives. 42) in other types of glycoside. 40). D-Diginose occurs in African Strophanthus species (Apocynaceae) whereas the L-isomer occurs in Asian species. 41b) is widespread. 42). The cardiac genins are described in Chapter 5. I[ a genin contains more than one hydroxyl group, diglycosides, in which sugars are linked to two different hydroxyl groups ofthe genin, may be formed.
Secondary Plant Metabolism by Margaret L. Vickery, Brian Vickery (auth.)