Pichia pastoris Pex14p, a phosphorylated peroxisomal membrane protein, is part of a PTS-receptor docking complex and interacts with many peroxins.
Monique A. Johnson,William B. Snyder,Joan Lin Cereghino,Marten Veenhuis,Suresh Subramani,James M. Cregg +5 more
TL;DR: The interactions between Px14p and other peroxins provide clues regarding the function of Pex14p in peroxisomal protein import.
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Abstract: The peroxisomal protein import machinery plays a central role in the assembly of this organelle in all eukaryotes, Genes encoding components of this machinery, termed peroxins or Pex proteins, have been isolated and characterized in several yeast species and in mammals, including humans. Here me report on one of these components, Pex14p, from the methylotrophic yeast Pichia pastoris. Work in other organisms has shown that Pex14p is located on the cytoplasmic surface of the peroxisomal membrane and binds peroxisomal targeting signal (PTS) receptors carrying proteins bound for the peroxisomal matrix, results that have led to the hypothesis that Pex14p is a receptor-docking protein. P. pastoris Pex14p (PpPex14p) behaves like an integral membrane protein, with its C-terminus exposed on the cytosolic side of the peroxisomal membrane. PpPex14p complexes with many peroxins, including Pex3p (Snyder et al,, 1999b), Pex5p, Pex7p, Pex13p, Pex17p, itself, and a previously unreported peroxin, Pex8p, A portion of Pex14p is phosphorylated, but both phosphorylated and unphosphorylated forms of Pex14p interact with several peroxins, The interactions between Pex14p and other peroxins provide clues regarding the function of Pex14p in peroxisomal protein import. Copyright (C) 2001 John Wiley & Sons, Ltd.
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TL;DR: PpAtg30 is a key player in the selection of peroxisomes as cargo and in their delivery to the autophagy machinery for pexophagy, and is required for formation of pexophile intermediates, such as the micropexophagy apparatus (MIPA) and the peXophagosome (Ppg).
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TL;DR: The majority of the large available set of carbon source dependent promoters for protein expression in yeasts, either induced or derepressed by the particular carbon source provided are summarized.
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