part of cytoplasm alpha,alpha-trehalose-phosphate synthase complex (UDP-forming) UDP-glucose-glucosephosphate glucosyltransferase complex trehalose-6-phosphate synthase complex cellular_component See also the molecular function term 'alpha,alpha-trehalose-phosphate synthase (UDP-forming) activity ; GO:0003825'. A protein complex that possesses alpha,alpha-trehalose-phosphate synthase (UDP-forming) and trehalose-phosphatase activities, and thus catalyzes two reactions in trehalose biosynthesis. In the complex identified in Saccharomyces, Tps1p has alpha,alpha-trehalose-phosphate synthase (UDP-forming) activity, Tps2p has trehalose 6-phosphate phosphatase activity; Tps3p is a regulatory subunit, and an additional subunit, Tsl1p, may be present. GO:0005946 trehalose-6-phosphate synthase/phosphatase transferase complex