Xyloglucan oligosaccharides

Table II. Effects of xyloglucan oligosaccharide subunits on auxin-stimulated growth of pea epicotyl segments in vivo and pea endo-1,4-/ -glucanase activity in vitro. Growth of segments in 1 //M 2,4-D was measured after 18 h. Endo-1,4-/J-gIucanase activity was determined viscometrically after 30 min using tamarind xyloglucan as substrate. Data calculated from refs. 50 and 51...

Crombie, H.J., Chengappa, S., Hellyer, A. and Reid, J.S.G. (1998). A xyloglucan oligosaccharide-active, transglycosylating beta-D-glucosidase from the cotyledons of nasturtium (Tropaeolum majus L) seedlings — purification, properties and characterization of a cDNA clone. Plant J., 15, 27-38. 

Lorences, E.P. and Fry, S.C. (1994). Sequencing of xyloglucan oligosaccharides by partial Driselase digestion the preparation and quantitative and qualitative analysis of two new tetrasaccharides. Carbohydr Res. 263, 285-293. 

Fig. 2. Some major xyloglucan oligosaccharides (XGOs) released from xyloglucan by the action of cellulase. 2 -Fucosyllactose (Fuc-Lac) is not a component of xyloglucan but is a structurally related trisaccharide found in human milk.

In addition, the induction of ripening in kiwi fruit by exogenous ethylene is accompanied by a large and rapid increase in extractable XET activity [49b]. A similar enzyme activity ( a specific xyloglucanase which is latent and activated by xyloglucan oligosaccharides ) has also been reported in tomato fruits [50], and this seems likely also to have been an endotransglycosylase. 

Zhou Q, Brumer H, Teeri TT (2009) Self-organization of cellulose nanocrystals adsorbed with xyloglucan oligosaccharide-poly(ethylene glycol)-polystyrene triblock copolymer. Macromolecules 42 5430-5432... 

FIGURE 11.1 TEM images of (a) cotton-derived CNs from dilute water suspension and (b) CNs coated with the triblock copolymer of xyloglucan oligosaccharide-WocA -poly(ethylene glycol)-i>/oc -polystyrene (XGO-fc-PEG-l -PS) (c) from dilute toluene suspension (scale bar 1 im). Reprinted with permission from Ref. [15]. 

W.S. York, A.G. Darvill, P. Albersheim. Inhibition of 2,4-dichlorophenoxyacetic acid-stimulated elongation of pea stem segments by a xyloglucan oligosaccharide. Plant Physiol, 1984, 75, 295-297... 

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