A Short Domain of the Plant Vacuolar Protein Phytohemagglutinin Targets Invertase to the Yeast Vacuole

1990 ◽  
Vol 2 (6) ◽  
pp. 533
Author(s):  
Brian W. Tague ◽  
Craig D. Dickinson ◽  
Maarten J. Chrispeels
Keyword(s):  
Yeast Vacuole ◽  
Vacuolar Protein

scholarly journals Polar Transmembrane Domains Target Proteins to the Interior of the Yeast Vacuole

2000 ◽  
Vol 11 (11) ◽  
pp. 3737-3749 ◽  
Author(s):  
Fulvio Reggiori ◽  
Michael W. Black ◽  
Hugh R. B. Pelham
Keyword(s):  
Endoplasmic Reticulum ◽  
Transmembrane Domain ◽  
Transmembrane Domains ◽  
Control Mechanisms ◽  
Multiple Points ◽  
Yeast Vacuole ◽  
Late Endosomes ◽  
Vacuolar Protein ◽  
Dependent Pathway ◽  
Endocytic Pathways

Membrane proteins transported to the yeast vacuole can have two fates. Some reach the outer vacuolar membrane, whereas others enter internal vesicles, which form in late endosomes, and are ultimately degraded. The vacuolar SNAREs Nyv1p and Vam3p avoid this fate by using the AP-3–dependent pathway, which bypasses late endosomes, but the endosomal SNARE Pep12p must avoid it more directly. Deletion analysis revealed no cytoplasmic sequences necessary to prevent the internalization of Pep12p in endosomes. However, introduction of acidic residues into the cytoplasmic half of the transmembrane domain created a dominant internalization signal. In other contexts, this same feature diverted proteins from the Golgi to endosomes and slowed their exit from the endoplasmic reticulum. The more modestly polar transmembrane domains of Sec12p and Ufe1p, which normally serve to hold these proteins in the endoplasmic reticulum, also cause Pep12p to be internalized, as does that of the vacuolar protein Cps1p. It seems that quality control mechanisms recognize polar transmembrane domains at multiple points in the secretory and endocytic pathways and in endosomes sort proteins for subsequent destruction in the vacuole. These mechanisms may minimize the damaging effects of abnormally exposed polar residues while being exploited for the localization of some normal proteins.

scholarly journals A short domain of the plant vacuolar protein phytohemagglutinin targets invertase to the yeast vacuole.

1990 ◽  
Vol 2 (6) ◽  
pp. 533-546 ◽  
Author(s):  
B W Tague ◽  
C D Dickinson ◽  
M J Chrispeels
Keyword(s):  
Yeast Vacuole ◽  
Vacuolar Protein

scholarly journals The plant vacuolar protein, phytohemagglutinin, is transported to the vacuole of transgenic yeast.

1987 ◽  
Vol 105 (5) ◽  
pp. 1971-1979 ◽  
Author(s):  
B W Tague ◽  
M J Chrispeels
Keyword(s):  
Signal Peptide ◽  
Yeast Cells ◽  
Cell Fractionation ◽  
Animal Cells ◽  
Yeast Vacuole ◽  
Transgenic Yeast ◽  
Protein Storage Vacuoles ◽  
Membrane Bound ◽  
Vacuolar Sorting ◽  
Vacuolar Protein

Phytohemagglutinin (PHA), the major seed lectin of the common bean, Phaseolus vulgaris, accumulates in the parenchyma cells of the cotyledons. It has been previously shown that PHA is cotranslationally inserted into the endoplasmic reticulum with cleavage of the NH2-terminal signal peptide. Two N-linked oligosaccharide side chains are added, one of which is modified to a complex type in the Golgi apparatus. PHA is then deposited in membrane-bound protein storage vacuoles which are biochemically and functionally equivalent to the vacuoles of yeast cells and the lysosomes of animal cells. We wished to determine whether yeast cells would recognize the vacuolar sorting determinant of PHA and target the protein to the yeast vacuole. We have expressed the gene for leukoagglutinating PHA (PHA-L) in yeast under control of the yeast acid phosphatase (PHO5) promoter. Under control of this promoter, PHA-L accumulates to 0.1% of the total yeast protein. PHA-L produced in yeast is glycosylated as expected for a yeast vacuolar glycoprotein. Cell fractionation studies show that PHA-L is efficiently transported to the yeast vacuole. This is the first demonstration that vacuolar targeting information is recognized between two highly divergent species. A small proportion of yeast PHA-L is secreted which may be due to inefficient recognition of the vacuolar sorting signal because of the presence of an uncleaved signal peptide on a subset of the PHA-L polypeptides. This system can now be used to identify the vacuolar sorting determinant of a plant vacuolar protein.

scholarly journals Vacuole Biogenesis in Saccharomyces cerevisiae: Protein Transport Pathways to the Yeast Vacuole

1998 ◽  
Vol 62 (1) ◽  
pp. 230-247 ◽  
Author(s):  
Nia J. Bryant ◽  
Tom H. Stevens
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Protein Delivery ◽  
Secretory Pathway ◽  
Protein Transport ◽  
Transport Pathway ◽  
Yeast Saccharomyces Cerevisiae ◽  
Transport Pathways ◽  
Yeast Vacuole ◽  
Lysosome Biogenesis ◽  
Vacuolar Protein

SUMMARY Delivery of proteins to the vacuole of the yeast Saccharomyces cerevisiae provides an excellent model system in which to study vacuole and lysosome biogenesis and membrane traffic. This organelle receives proteins from a number of different routes, including proteins sorted away from the secretory pathway at the Golgi apparatus and endocytic traffic arising from the plasma membrane. Genetic analysis has revealed at least 60 genes involved in vacuolar protein sorting, numerous components of a novel cytoplasm-to-vacuole transport pathway, and a large number of proteins required for autophagy. Cell biological and biochemical studies have provided important molecular insights into the various protein delivery pathways to the yeast vacuole. This review describes the various pathways to the vacuole and illustrates how they are related to one another in the vacuolar network of S. cerevisiae.

scholarly journals Propofol suppresses cell viability, cell cycle progression and motility and induces cell apoptosis of ovarian cancer cells through suppressing MEK/ERK signaling via targeting circVPS13C/miR-145 axis

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Huan Lu ◽  
Guanlin Zheng ◽  
Xiang Gao ◽  
Chanjuan Chen ◽  
Min Zhou ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Ovarian Cancer ◽  
Cancer Cells ◽  
Rna Binding ◽  
Erk Signaling ◽  
Luciferase Reporter ◽  
Migration And Invasion ◽  
Ovarian Cancer Cells ◽  
Dependent Manner ◽  
Vacuolar Protein

Abstract Background Propofol is a kind of common intravenous anaesthetic agent that plays an anti-tumor role in a variety of cancers, including ovarian cancer. However, the working mechanism of Propofol in ovarian cancer needs further exploration. Methods The viability and metastasis of ovarian cancer cells were assessed by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and transwell assays. Flow cytometry was used to evaluate the cell cycle and apoptosis. Quantitative real-time polymerase chain reaction (qRT-PCR) was used to examine the abundance of circular RNA vacuolar protein sorting 13 homolog C (circVPS13C) and microRNA-145 (miR-145). The target relationship between miR-145 and circVPS13C was predicted by circinteractome database and verified by dual-luciferase reporter assay, RNA-binding protein immunoprecipitation (RIP) assay and RNA-pull down assay. Western blot assay was used to detect the levels of phosphorylated extracellular regulated MAP kinase (p-ERK), ERK, p-MAP kinse-ERK kinase (p-MEK) and MEK, in ovarian cancer cells. Results Propofol treatment suppressed the viability, cell cycle and motility and elevated the apoptosis rate of ovarian cancer cells. Propofol up-regulated miR-145 in a dose-dependent manner. Propofol exerted an anti-tumor role partly through up-regulating miR-145. MiR-145 was a direct target of circVPS13C. Propofol suppressed the progression of ovarian cancer through up-regulating miR-145 via suppressing circVPS13C. Propofol functioned through circVPS13C/miR-145/MEK/ERK signaling in ovarian cancer cells. Conclusion Propofol suppressed the proliferation, cell cycle, migration and invasion and induced the apoptosis of ovarian cancer cells through circVPS13C/miR-145/MEK/ERK signaling in vitro.

scholarly journals A cryo–electron tomography workflow reveals protrusion-mediated shedding on injured plasma membrane

2021 ◽  
Vol 7 (13) ◽  
pp. eabc6345
Author(s):  
Shrawan Kumar Mageswaran ◽  
Wei Yuan Yang ◽  
Yogaditya Chakrabarty ◽  
Catherine M. Oikonomou ◽  
Grant J. Jensen
Keyword(s):  
Plasma Membrane ◽  
Molecular Mechanisms ◽  
Electron Tomography ◽  
Membrane Damage ◽  
Light And Electron Microscopy ◽  
Actin Dynamics ◽  
Endosomal Sorting ◽  
Plasma Membrane Damage ◽  
Cryo Electron Tomography ◽  
Vacuolar Protein

Cryo–electron tomography (cryo-ET) provides structural context to molecular mechanisms underlying biological processes. Although straightforward to implement for studying stable macromolecular complexes, using it to locate short-lived structures and events can be impractical. A combination of live-cell microscopy, correlative light and electron microscopy, and cryo-ET will alleviate this issue. We developed a workflow combining the three to study the ubiquitous and dynamic process of shedding in response to plasma membrane damage in HeLa cells. We found filopodia-like protrusions enriched at damage sites and acting as scaffolds for shedding, which involves F-actin dynamics, myosin-1a, and vacuolar protein sorting 4B (a component of the ‘endosomal sorting complex required for transport’ machinery). Overall, shedding is more complex than current models of vesiculation from flat membranes. Its similarities to constitutive shedding in enterocytes argue for a conserved mechanism. Our workflow can also be adapted to study other damage response pathways and dynamic cellular events.

scholarly journals Parkinson’s Disease Causative Mutation in Vps35 Disturbs Tetherin Trafficking to Cell Surfaces and Facilitates Virus Spread

Cells ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 746
Author(s):  
Yingzhuo Ding ◽  
Yan Li ◽  
Gaurav Chhetri ◽  
Xiaoxin Peng ◽  
Jing Wu ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Ectopic Expression ◽  
Lewy Bodies ◽  
Cell Protein ◽  
Causative Mutation ◽  
Virus Spread ◽  
Cell Surfaces ◽  
Vacuolar Protein ◽  
Hsv 1

Parkinson’s disease (PD) is the most common neurodegenerative movement disorder, characterized by progressive loss of dopaminergic neurons in the substantia nigra, intraneuronal deposition of misfolded proteins known as Lewy bodies, and chronic neuroinflammation. PD can arise from monogenic mutations, but in most cases, the etiology is unclear. Viral infection is gaining increasing attentions as a trigger of PD. In this study, we investigated whether the PD-causative 620 aspartate (D) to asparagine (N) mutation in the vacuolar protein sorting 35 ortholog (Vps35) precipitated herpes simplex virus (HSV) infection. We observed that ectopic expression of Vps35 significantly reduced the proliferation and release of HSV-1 virions; the D620N mutation rendered Vps35 a partial loss of such inhibitory effects. Tetherin is a host cell protein capable of restricting the spread of encapsulated viruses including HSV-1 and SARS-Cov-2, both of which are implicated in the development of parkinsonism. Compared with cells overexpressing wildtype Vps35, cells expressing mutant Vps35 with D620N had less Tetherin on cell surfaces. Real-time and static cell imaging revealed that Tetherin recycled through Vps35-positive endosomes. Expression of Vps35 with D620N reduced endosomal dynamics and frequency of motile Tetherin-containing vesicles, a sign of defective production of recycling carriers. Our study suggests that the D620N mutation in Vps35 hinders Tetherin trafficking to cell surfaces and facilitates virus spread.

Sign in / Sign up

Export Citation Format

Share Document