Rho Gtpase
Rho Gtpase - Related Videos
01:24
Small GTPases - Ras and Rho
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2023
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. Three regulatory proteins control their activity: Guanine nucleotide exchange factors or GEF, GTPase-activating proteins or GAPs, and Guanine nucleotide-dissociation inhibitors or GDIs. The GEF activates the GTPase by exchanging the bound-GDP with GTP. The GTPases’...
02:14
GTPases and their Regulation
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2020
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, also known...
02:14
GTPases and their Regulation
0 Views •
2023
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, also known...
04:05
Competition Binding Assay to Study Competing GTPase-Binding Protein Partners
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2025
This video demonstrates a competition assay to study GTPase-binding protein partners. Utilizing nucleotide-bound GTPase protein immobilized on magnetic beads, the competitive binding between two interacting protein partners for the same binding site on the GTPase can be studied to assess the binding affinities of the protein partners.
01:33
Coat Assembly and GTPases
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2023
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. Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
FAQs
Guanine nucleotide exchange factors activate Rho GTPases by promoting the transition to the GTP-bound state. GTPase-activating proteins accelerate the return to the GDP-bound state, limiting signal duration. Guanine nucleotide dissociation inhibitors provide an additional layer of control by regulating where these molecular switches are localized within the cell.
The GDP-to-GTP cycle allows signals arriving at the cell surface to be transmitted in a controlled, reversible manner to intracellular machinery. Its timing and regulation help coordinate changes in cell shape, movement, adhesion, and organization. Disruption of this cycle can therefore alter the cellular behaviors that depend on precisely localized signaling.
RhoA, Rac1, and Cdc42 coordinate distinct actin-based structures rather than producing identical cytoskeletal responses. RhoA is associated with contractile fibers, Rac1 with membrane protrusions, and Cdc42 with polarity networks. Their different outputs help cells organize force, extend the membrane, and establish directional structure during movement and adhesion.
Analyzing these pathways can connect cell-surface signaling with changes in intracellular organization and behavior. Researchers can use that relationship to investigate how cells alter shape, move, adhere, or establish polarity. The resulting information is relevant to tissue development, wound healing, immune-cell migration, and signaling abnormalities associated with cancer and other diseases.
Tissue development, wound healing, and immune-cell migration provide important biological contexts because each depends on coordinated changes in cell organization and movement. Studying Rho GTPase pathways in these settings helps relate molecular signaling to larger biological outcomes, including how cells position themselves, interact with neighboring cells, and respond during repair or defense.
Rho GTPases are clinically relevant because signaling errors in these pathways can disturb the cellular organization and behaviors they normally regulate. Abnormal control may affect shape, adhesion, movement, or related intracellular responses. Investigating these defects helps connect molecular signaling problems with disease processes, particularly cancer, while also informing broader biological research.