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The primary activity of protein disulfide isomerase (PDI), a multifunctional resident of the endoplasmic reticulum (ER), is the isomerization of disulfide bridges during protein folding. We isolated a cDNA encoding Dictyostelium discoideum PDI (Dd-PDI). Phylogenetic analyses and basic biochemical properties indicate that it belongs to a subfamily called P5, many members of which differ from the classical...
Cells of the unicellular eukaryote Dictyostelium discoideum take up all their nutrients by endocytosis. Both particle- and fluid-containing vacuoles are transiently surrounded by a cytoskeletal coat [1,2]. When this coat has dissociated, acidification and digestion of the vesicle contents occur, followed by exocytosis of the indigestible remnants after 60–90 minutes. At least nine compartments are...
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