Reference: Rothman JH and Stevens TH (1986) Protein sorting in yeast: mutants defective in vacuole biogenesis mislocalize vacuolar proteins into the late secretory pathway. Cell 47(6):1041-51

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Abstract


We have devised a genetic selection for mutant yeast cells that fail to properly deliver the vacuolar glycoprotein CPY to the lysosome-like vacuole. This has allowed us to identify mutations in eight VPL complementation groups that result in aberrant secretion of up to approximately 90% of the immunoreactive CPY. Other soluble vacuolar proteins are also affected by each vpl mutation, demonstrating that a sorting system for multiple vacuolar proteins exists in yeast. Mislocalized CPY apparently traverses late stages of the secretory pathway, since a vesicle-accumulating sec1 mutation prevents secretion of this protein. Despite the presence of abnormal membrane-enclosed organelles in some of the vpl mutants, maturation and secretion of invertase are not substantially perturbed. Thus vpl mutations define a new class of genes that encode products required for sorting of newly synthesized vacuolar proteins from secretory proteins during their transit through the yeast secretory pathway.

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Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
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Rothman JH, Stevens TH
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