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Related Concept Videos

GTPases and their Regulation02:14

GTPases and their Regulation

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Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒  small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins,...
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Autophagy01:27

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Coat Assembly and GTPases01:33

Coat Assembly and GTPases

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Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
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Small GTPases - Ras and Rho01:24

Small GTPases - Ras and Rho

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Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
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Rab Cascades01:25

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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Related Experiment Video

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Study of Protein-protein Interactions in Autophagy Research
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Small GTPase proteins in macroautophagy.

Shu Yang1, Anne Rosenwald1

  • 1a Department of Biology , Georgetown University , Washington, DC , USA.

Small Gtpases
|November 2, 2016
PubMed
Summary

Cellular stress triggers macroautophagy, a survival process. This study explores the roles of Arl1 and Ypt6 GTPases in yeast autophagosome formation and function.

Keywords:
Arl1GTPase-activating protein (GAP)Saccharomyces cerevisiaeYpt6autophagosomeguanine nucleotide exchange factor (GEF)macroautophagymembrane traffic

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Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • Macroautophagy is a conserved cellular process crucial for survival during stress, particularly nutrient starvation.
  • It involves engulfing cellular components into autophagosomes for lysosomal degradation and recycling.
  • Small GTPases are increasingly recognized for their roles in autophagosome biogenesis and membrane trafficking.

Purpose of the Study:

  • To review recent findings on the roles of Arl1 and Ypt6 GTPases in yeast macroautophagy.
  • To integrate these findings with existing literature on small GTPases in autophagy.
  • To discuss future research directions for understanding GTPase involvement in autophagy.

Main Methods:

  • Review of recent experimental findings on Arl1 and Ypt6.
  • Literature review of small GTPases in autophagy.
  • Analysis of yeast (S. cerevisiae) models.

Main Results:

  • Arl1 (Arf/Arl/Sar family) and Ypt6 (Rab family) GTPases play roles in autophagosome formation.
  • These GTPases function in novel ways related to membrane traffic during autophagy.
  • The study integrates findings from yeast models with broader literature.

Conclusions:

  • Small GTPases are essential regulators of macroautophagy.
  • Further research is needed to fully elucidate the specific functions of various GTPases in the autophagic pathway.
  • Understanding these roles can provide insights into cellular stress responses and survival mechanisms.