Ras-raf Complex
Ras-raf Complex - Related Videos
07:26
Generation of Organotypic Raft Cultures from Primary Human Keratinocytes
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Cited by 47 •
2012
An in vitro method to mimic in vivo epithelial differentiation is described. Many viruses target epithelial cells as part of their viral life cycle, and this method provides a means of examining virus:host interactions that more closely resembles that which occurs in vivo. This technique can be used with primary keratinocytes, established cell lines, as well as normal or diseased biopsy tissue.
02:38
The Ras Gene
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2021
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis. Ras is a superfamily...
02:38
The Ras Gene
0 Views •
2023
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis. Ras is a superfamily...
10:54
Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
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2015
An efficient, three-step synthesis of RAFT-based fluorescent glycopolymers, consisting of glycomonomer preparation, copolymerization, and post-modification, is demonstrated. This protocol can be used to prepare RAFT-based statistical glycopolymers with desired structures.
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’...
FAQs
Plasma-membrane recruitment places RAF where activated Ras and other membrane-associated factors can influence its activation state. This spatial organization is important because Ras binding alone is not presented as an isolated event; membrane context helps convert the interaction into productive RAF signaling. Studying localization therefore clarifies how growth-factor signals become intracellular kinase responses.
The nucleotide exchange acts as a signaling gate for Ras. Growth-factor stimulation promotes replacement of GDP with GTP, creating the Ras state that can recruit RAF. This provides a regulated connection between an extracellular stimulus and downstream pathway initiation, allowing experiments to relate Ras activation state to RAF binding and subsequent signaling behavior.
RAF phosphorylation of MEK connects the Ras-associated event to the RAF-MEK-ERK mitogen-activated protein kinase cascade. MEK therefore serves as a downstream transmission point rather than merely another binding partner. Measuring this step helps determine whether Ras-RAF assembly produces functional pathway output linked to proliferation, differentiation, or survival.
Binding and signaling can be examined as related but different outcomes. Co-immunoprecipitation or fluorescence imaging can characterize association and cellular localization, whereas a biochemical kinase assay can evaluate RAF activity through its ability to phosphorylate MEK. Combining these approaches helps determine whether a detected complex is also functionally competent.
Co-immunoprecipitation is useful for testing whether Ras and RAF occur in the same molecular assembly under the conditions examined. Its main contribution is evidence of association, which can be compared with fluorescence-based localization or kinase measurements. This makes it valuable for characterizing complex formation without treating binding alone as proof of downstream activation.
Fluorescence imaging is particularly informative when the research question concerns where Ras and RAF are positioned during signaling. Because the interaction is associated with recruitment to the plasma membrane, imaging can help examine spatial organization and changes after growth-factor stimulation. These observations complement biochemical measurements by adding cellular localization to the analysis.
Structural analysis can examine the organization of the Ras-RAF interaction, while biochemical kinase assays test its functional consequence through RAF-dependent MEK phosphorylation. Applying these methods to mutations associated with cancer can help relate altered complex formation or pathway regulation to changes in signaling. Together, they connect molecular architecture with measurable kinase activity.