ID 2.4.1.14 DE sucrose-phosphate synthase. AN sucrosephosphate--UDP glucosyltransferase. AN UDP-glucose-fructose-phosphate glucosyltransferase. CA beta-D-fructose 6-phosphate + UDP-alpha-D-glucose = H(+) + sucrose 6(F)- CA phosphate + UDP. CC -!- The enzyme from Synechocystis sp. strain PCC 6803 is not specific for CC UDP-glucose as it can use ADP-glucose and, to a lesser extent, GDP- CC glucose as substrates. CC -!- The enzyme from rice leaves is activated by glucose 6-phosphate but CC that from cyanobacterial species is not. CC -!- While the reaction catalyzed by this enzyme is reversible, the enzyme CC usually works in concert with EC 3.1.3.24 to form sucrose, making the CC above reaction essentially irreversible. CC -!- The F in sucrose 6(F)-phosphate is used to indicate that the fructose CC residue of sucrose carries the substituent. DR Q94BT0, SPSA1_ARATH; O22060, SPSA1_CITUN; O04932, SPSA1_CRAPL; DR A2WYE9, SPSA1_ORYSI; Q0JGK4, SPSA1_ORYSJ; Q9FY54, SPSA2_ARATH; DR O04933, SPSA2_CRAPL; B7F7B9, SPSA2_ORYSJ; Q8RY24, SPSA3_ARATH; DR Q67WN8, SPSA3_ORYSJ; F4JLK2, SPSA4_ARATH; Q6ZHZ1, SPSA4_ORYSJ; DR Q53JI9, SPSA5_ORYSJ; P49031, SPSA_BETVU ; P31927, SPSA_MAIZE ; DR Q43845, SPSA_SOLTU ; P31928, SPSA_SPIOL ; Q43876, SPSA_VICFA ; DR A6LKE9, SPS_THEM4 ; //