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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.
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Small GTPases - Ras and Rho01:24

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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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IP3/DAG Signaling Pathway01:11

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Activation and Inactivation of G Proteins01:22

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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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Coat Assembly and GTPases01:33

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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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Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
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IQGAP1 is a key node within the small GTPase network.

Guillaume Jacquemet1, Martin J Humphries1

  • 1Wellcome Trust Centre for Cell-Matrix Research; Faculty of Life Sciences; University of Manchester; Manchester, UK.

Small Gtpases
|December 21, 2013
PubMed
Summary
This summary is machine-generated.

IQGAP1 acts as a master regulator, coordinating multiple small GTPases essential for cell migration. This scaffolding protein integrates signals and orchestrates cell behavior by interacting with numerous GTPases and their regulators.

Keywords:
IQGAP1Ras GTPasessignal transductionsmall GTPase crosstalksmall GTPase network

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Area of Science:

  • Cell Biology
  • Molecular Signaling

Background:

  • Small GTPases are crucial for physiological processes like cell migration.
  • Understanding the mechanisms controlling small GTPase activity and their interplay is incomplete.

Purpose of the Study:

  • To identify key proteins that integrate signaling events and coordinate multiple small GTPase activities.
  • To investigate the role of IQGAP1 as a potential master regulator within the small GTPase network.

Main Methods:

  • Literature-curated searches for IQGAP1-binding partners.
  • Mass spectrometric analysis of IQGAP1 interactome.
  • Assembly of a small GTPase network using protein-protein interaction databases.

Main Results:

  • IQGAP1 identified as a master regulator of Cdc42, Rac1, Rap1, and RhoA.
  • IQGAP1 promotes Arf6 activation downstream of β1 integrin.
  • IQGAP1 recruits various small GTPases, regulators (e.g., Tiam1, RacGAP1), and effectors (e.g., PAK6, mDia1).

Conclusions:

  • IQGAP1 functions as a scaffolding platform within the small GTPase network.
  • IQGAP1 orchestrates cell behavior by recruiting and regulating small GTPases, their regulators, and effectors.
  • IQGAP1 is a key integrator of small GTPase crosstalk.