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Ncr1p, the Yeast Ortholog of Mammalian Niemann Pick C1 Protein, is Dispensable for Endocytic Transport

Authors: Zhang, Shaochong; Ren, Jihui; Li, Hongzhe; Zhang, Qian; S. Armstrong, Jeffery; L. Munn, Alan; Yang, Hongyuan;

Ncr1p, the Yeast Ortholog of Mammalian Niemann Pick C1 Protein, is Dispensable for Endocytic Transport

Abstract

The Niemann Pick C1 protein localizes to late endosomes and plays a key role in the intracellular transport of cholesterol in mammalian cells. Cholesterol and other lipids accumulate in a lysosomal or late endosomal compartment in cells lacking normal NPC1 function. Other than accumulation of lipids, defects in lysosomal retroendocytosis, sorting of a multifunctional receptor and endosomal movement have also been detected in NPC1 mutant cells. Ncr1p is an ortholog of NPC1 in the budding yeast Saccharomyces cerevisiae. In this study, we show that Ncr1p is a vacuolar membrane protein that transits through the biosynthetic vacuolar protein sorting pathway, and that it can be solubilized by Triton X‐100 at 4 °C. Using well‐established assays, we demonstrate that the absence of Ncr1p had no effect on fluid phase and receptor‐ mediated endocytosis, biosynthetic delivery to the vacuole, retrograde transport from endosome to Golgi and ubiquitin‐ and nonubiquitin‐dependent multivesicular body sorting. We conclude that Ncr1p does not have an essential role in known endocytic transport pathways in yeast.

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Australia, Singapore, Singapore
Keywords

Saccharomyces cerevisiae Proteins, Vesicular Transport Proteins, Golgi Apparatus, Expression, Saccharomyces-cerevisiae, 730107 Inherited diseases (incl. gene therapy), Carboxypeptidases, Saccharomyces cerevisiae, Endocytic Membrane Transport, C1, Endocytic membrane transport, Homeostasis, Budding yeast, Niemann Pick C1, Raft, Sequence Deletion, Endosomal Transport, Compartments, Membrane Glycoproteins, Vacuolar Protein Sorting, Ubiquitin, Cell Membrane, Membrane, Cell Biology, Multivesicular Body, 540, Endocytosis, Vacuolar protein sorting, 270199 Biochemistry and Cell Biology not elsewhere classified, Protein Transport, Medical Microbiology, Mutation, Vacuoles, Vacuole, Biochemistry and Cell Biology, Sterol-sensing Domain, RAFT, Budding Yeast

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
30
Top 10%
Top 10%
Top 10%
bronze