Sucrose-cleaving enzyme that provides UDP-glucose and fructose for various metabolic pathways. an NDP-alpha-D-glucose + D-fructose = a ribonucleoside 5'-diphosphate + H(+) + sucrose Optimum pH is 6.0-7.0 for degradative reaction (PubMed:22184213, PubMed:17257168). Optimum pH is 7.0 for synthetic reaction (PubMed:22184213). Optimum pH is 9.0-9.5 for synthetic reaction (PubMed:17257168). Homotetramer. Expressed in the phloem of leaves and in roots. Detected in the whole plant but more precisely confined to the vasculature in cotyledons, mature leaves and siliques. By cold, drought and anaerobic stress. By sugar or osmoticum. By anoxia in the roots (at protein level). Up-regulated by NUC/IDD8. No visible phenotype. A one-pot system for efficient enzymatic production of a wide range of glucosides couples the activities of two recombinant enzymes, UDP-glucose: curcumin glucosyltransferase from Catharanthus roseus (CaUGT2) and sucrose synthase from Arabidopsis thaliana (AtSUS1). UDP, a product inhibitor of UDP-glucosyltransferase, was removed from the system and used for regeneration of UDP-glucose by the second enzyme, AtSUS1. The productivity was increased several-fold and UDP-glucose initially added to the reaction mixture could be reduced to one-tenth of the normal level. Belongs to the glycosyltransferase 1 family. Plant sucrose synthase subfamily. Truncated N-terminus.