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Brown CR, et al.  (2010) The TOR complex 1 is distributed in endosomes and in retrograde vesicles that form from the vacuole membrane and plays an important role in the vacuole import and degradation pathway. J Biol Chem 285(30):23359-70

Abstract: The key gluconeogenic enzyme fructose-1,6-bisphosphatase (FBPase) is induced when Saccharomyces cerevisiae are starved of glucose. However, when glucose is added to cells that have been starved for 3 days, FBPase is degraded in the vacuole. FBPase is first imported to Vid (vacuole import and degradation) vesicles and these vesicles then merge with the endocytic pathway. In this report, we show that two additional gluconeogenic enzymes, isocitrate lyase and phosphoenolpyruvate carboxykinase were also degraded in the vacuole via the Vid pathway. These new cargo proteins and FBPase interacted with the TORC1 complex during glucose starvation. However, Tor1p was dissociated from FBPase following the addition of glucose. FBPase degradation was inhibited in cells overexpressing TOR1, suggesting that excessive Tor1p is inhibitory. Both Tco89p and Tor1p were found in endosomes coming from the plasma membrane as well as in retrograde vesicles forming from the vacuole membrane. When TORC1 was inactivated by rapamycin, FBPase degradation was inhibited. We suggest that TORC1 interacts with multiple cargo proteins destined for the Vid pathway and plays an important role in the degradation of FBPase in the vacuole.

Status: Published Type: Journal Article PubMed ID: 20457600

Topics addressed in this paper

Number of different genes curated to this paper: 13

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Topics Genes linked to topics (#1 - 10 )
FBP1 ICL1 KOG1 LST8 MDH2 PCK1 PEP4 PRB1 PRC1 TCO89
Additional Literature blue ball blue ball blue ball blue ball blue ball
Cellular Location blue ball blue ball blue ball blue ball blue ball
Function/Process blue ball blue ball blue ball
Mutants/Phenotypes blue ball blue ball blue ball blue ball
Primary Literature blue ball blue ball blue ball blue ball blue ball
Protein Processing/Modification/Regulation blue ball blue ball blue ball blue ball
Protein-protein Interactions blue ball blue ball blue ball blue ball blue ball blue ball blue ball
Strains/Constructs blue ball blue ball blue ball blue ball blue ball blue ball blue ball blue ball

Topics Genes linked to topics (#11 - 13 )
TOR1 VID22 VID24
Additional Literature blue ball
Cellular Location blue ball blue ball
Function/Process blue ball
Mutants/Phenotypes blue ball blue ball blue ball
Primary Literature blue ball blue ball
Protein-protein Interactions blue ball
Regulation of blue ball blue ball
Regulatory Role blue ball
Strains/Constructs blue ball blue ball blue ball

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