Gst-rho Binding Domain
Gst-rho Binding Domain - Related Videos
11:28
Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein (GST-RhoA(G17A)) from Epithelial Cell Lysates
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Cited by 14 •
2012
The method presented here describes an assay to follow activation of RhoA specific GDP/GTP Exchange Factors (GEFs) in cultured cells by making use of a mutant RhoA GST fusion protein that has high affinity for activated GEFs. GEFs are precipitated from cell lysates, detected by Western blotting and quantified by densitometry.
11:22
GST-His purification: A Two-step Affinity Purification Protocol Yielding Full-length Purified Proteins
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Cited by 18 •
2013
In the present protocol, we demonstrate a highly efficient and cost-effective small-scale protein purification method, which allows purification of recombinant proteins by uniquely combining a cleavable GST-tag and a small His-tag.
12:27
Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery
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Cited by 2 •
2016
Self-assembled polyelectrolyte complexes (PEC) fabricated from heparin and protamine were deposited on alginate beads to entrap and regulate the release of osteogenic growth factors. This delivery strategy enables a 20-fold reduction of BMP-2 dose in spinal fusion applications. This article illustrates the benefits and fabrication of PECs.
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’...
10:08
Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain
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Cited by 1 •
2012
A method for large-scale purification of the APP intracellular domain (AICD) is described. We also describe methodology to induce in vitro AICD aggregation and visualization by atomic force microscopy. The methods described are useful for biochemical/structural characterization of the AICD and the effects of molecular chaperones on its aggregation.
FAQs
The key discriminator is Rho’s nucleotide-dependent conformation. When Rho is GTP-loaded, it adopts the state recognized by the effector-derived binding domain; the GDP-bound form interacts little or not at all. This molecular selectivity lets the assay distinguish signaling-competent Rho from the broader pool of Rho protein, rather than simply measuring total Rho abundance.
GST serves as the affinity handle in the recombinant construct. Because GST binds glutathione, the fusion protein can be captured on glutathione-coated beads while its Rho-binding region remains available to interact with proteins in a cell lysate. This arrangement couples immobilization to selective recognition, enabling active Rho to be separated from uncaptured lysate components for downstream analysis.
That distinction makes the readout functional rather than merely quantitative. A sample may contain Rho protein in both states, but only GTP-loaded molecules are expected to be retained efficiently by the binding domain. Consequently, the recovered fraction reports the active signaling pool, which is relevant when comparing changes in cytoskeletal organization, cell adhesion, or migration.
The fusion protein is first immobilized on glutathione-coated beads, which provide the capture surface through the GST tag. The bead-bound construct is then incubated with a cell lysate so that activated Rho can bind its effector-derived domain. After recovery of the bead-associated material, the retained Rho is measured by immunoblotting or another related analysis.
The essential components are the recombinant GST-containing construct, glutathione-coated beads, and a cell lysate containing Rho proteins in different nucleotide states. Following incubation and recovery, immunoblotting or a related analytical method is used to evaluate the Rho fraction captured by the binding domain. These components connect molecular recognition with a measurable experimental output.
Isolating the active fraction supports studies of Rho signaling in processes that depend on cytoskeletal organization, cell adhesion, and cell migration. Researchers can use the approach to examine pathway changes associated with cellular dynamics or disease-related alterations. Because the assay focuses on GTP-loaded Rho, it provides context about signaling activity rather than total Rho presence alone.