Xyloglucan endotransglycosylase (XET) (from the English. Xyloglucan endotransglucosylase ) is an apoplastic enzyme found in almost all representatives of the plant kingdom. It carries out the transglycosylation reaction of xylogucans, in which one chain of xyloglucan is cleaved, and then attached again to the non-reducing end of the other xyloglucan [1] .
Functions
XET promotes cell growth by stretching, destroying xyloglucan cross-links between cellulose microfibrils, and then rearranging them. The destruction of xyloglucan crosslinks between cellulose microfibrils makes the cell wall more friable, as a result of which it stretches under the influence of the water entering the cell. The launch of active XET synthesis occurs under the influence of brassinosteroids .