Catalytic subunit of 1,3-beta-D-glucan synthase; transfers glucose from UDP-glucose to growing glucan chains via β-1,3-glycosidic linkages, translocating β-1,3-glucan to the extracellular space; role in cell wall synthesis and maintenance; functionally redundant with alternate catalytic subunit Gsc2p; activity regulated by synthase complex subunit Rho1p; stabilized by Gsr1p; binds tRNA, forming an inactive tRNA-mediated homodimer; localizes to cell wall remodeling sites; antifungal drug target