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Brown CR, et al.  (2010) The vacuole import and degradation pathway utilizes early steps of endocytosis and actin polymerization to deliver cargo proteins to the vacuole for degradation. J Biol Chem 285(2):1516-28

Abstract: When glucose is added to yeast cells that are starved for 3 days, fructose-1,6-bisphosphatase (FBPase) and malate dehydrogenase 2 are degraded in the vacuole via the vacuole import and degradation (Vid) pathway. In this study, we examined the distribution of FBPase at the ultrastructural level. FBPase was observed in areas close to the plasma membrane and in cytoplasmic structures that are heterogeneous in size and density. We have isolated these intracellular structures that contain FBPase, the Vid vesicle marker Vid24p, and the endosomal marker Pep12p. They appeared irregular in size and shape. In yeast, actin polymerization plays an important role in early steps of endocytosis. Mutants that affect actin polymerization inhibited FBPase degradation, suggesting that actin polymerization is important for FBPase degradation. Both FBPase and malate dehydrogenase 2 were associated with actin patches. Vid vesicle proteins such as Vid24p or Sec28p were also at actin patches, although they dissociated from these structures at later time points. We propose that Vid24p and Sec28p are present at actin patches during glucose starvation. Cargo proteins arrive at these sites following the addition of glucose, and the endocytic vesicles then pinch off from the plasma membrane. Following the fusion of endosomes with the vacuole, cargo proteins are then degraded in the vacuole.

Status: Published Type: Journal Article | Research Support, N.I.H., Extramural | Research Support, Non-U.S. Gov't PubMed ID: 19892709

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 )
ABP1 END3 FBP1 MDH2 MYO3 PEP12 PEP4 RVS167 SEC28 SLA1
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Cellular Location blue ball blue ball blue ball blue ball
Mutants/Phenotypes blue ball blue ball blue ball blue ball blue ball
Primary Literature blue ball blue ball
Protein Processing/Modification/Regulation blue ball
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Topics Genes linked to topics (#11 - 13 )
UBC1 VID24 VPH1
Additional Literature blue ball blue ball
Cellular Location blue ball
Mutants/Phenotypes blue ball blue ball
Primary Literature blue ball
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