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Phosphatidylethanolamine, a limiting factor of autophagy in yeast strains bearing a defect in the carboxypeptidase Y pathway of vacuolar targeting.

J Biol Chem. 2007 Jun 08;282(23):16736-43. Epub 2007 Apr 11
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摘要


Vps4p and Vps36p of Saccharomyces cerevisiae are involved in the transport of proteins to the vacuole via the carboxypeptidase Y pathway. We found that deletion of VPS4 and VPS36 caused impaired maturation of the vacuolar proaminopeptidase I (pAPI) via autophagy or the cytosol to vacuole targeting pathway. Supplementation with ethanolamine rescued this defect, leading to an increase of the cellular amount of phosphatidylethanolamine (PtdEtn), an enhanced level of the PtdEtn-binding autophagy protein Atg8p and a balanced rate of autophagy. We also discovered that maturation of pAPI was generally affected by PtdEtn depletion in a psd1Delta psd2Delta mutant due to reduced recruitment of Atg8p to the preautophagosomal structure. Ethanolamine supplementation provided the necessary amounts of PtdEtn for complete maturation of pAPI. Since the expression level of Atg8p was not compromised in the psd1Delta psd2Delta strain, we concluded that the amount of available PtdEtn was limiting. Thus, PtdEtn appears to be a limiting factor for the balance of the carboxypeptidase Y pathway and autophagy/the cytosol to vacuole targeting pathway in the yeast.

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