2.7.8.19 additional information may be a controlling enzyme for targeting of certain newly synthesized proteins to the cell surface 2.7.8.19 UDP-glucose + parafusin reversible phosphoglycosylation of parafusin could play an important role in signal transduction during secretion in Paramecium tetraurelia, a protein evidently associated with membrane fusion during exocytosis 2.7.8.19 UDP-glucose + phosphoglucomutase - 2.7.8.19 UDP-glucose + phosphoglucomutase underglucosylated phosphoglucomutase increases GlcPTase activity in vitro, this underglucosylated state is maximized when galactose is used as carbon source or following a heat shock in Saccharomyces cerevisiae cultures