Ras Map Kinase Pathway
Ras Map Kinase Pathway - Related Videos
01:25
cAMP-dependent Protein Kinase Pathways
0 Views •
2023
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
02:54
Protein Kinases and Phosphatases
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2020
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven. Protein kinases Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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...
09:32
Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Cited by 7 •
2017
This protocol describes an optogenetic strategy to modulate mitogen-activated protein kinase (MAPK) activity during cell differentiation and Xenopus embryonic development. This method allows for the reversible activation of the MAPK signaling pathway in mammalian cell culture and in multicellular live organisms, like Xenopus embryos, with high spatial and temporal resolution.
FAQs
Activation begins when an extracellular ligand binds a receptor tyrosine kinase. The receptor then promotes exchange of GDP for GTP on Ras, converting Ras into its active signaling state. This nucleotide exchange is a key control point because it links detection of a growth-related cue at the cell surface with downstream intracellular signaling.
Raf, MEK, and ERK form an ordered kinase cascade in which one activated kinase stimulates the next. This arrangement carries the signal from active Ras toward cellular targets through successive phosphorylation events. The sequence gives the pathway a defined signaling route and enables extracellular information to produce coordinated changes in cell behavior.
Activated ERK phosphorylates targets in both the cytoplasm and the nucleus. Cytoplasmic targets can influence cell behavior directly, while nuclear targets can modify gene expression. Through these distinct target locations, ERK connects the kinase cascade to outcomes such as growth, differentiation, survival, and developmental responses.
Researchers can examine the pathway as a sequence linking growth-factor stimulation to Ras activation, the Raf-MEK-ERK cascade, and changes in gene expression. Assessing these components helps organize how an extracellular cue affects cell behavior. This framework is useful for studying responses related to growth, differentiation, and survival in biology.
The pathway provides a framework for understanding how signaling errors can disrupt normal control of cell behavior. Because its signaling is associated with growth and survival, abnormal pathway activity is relevant to cancer research. Investigators can therefore use the pathway's components to connect altered intracellular signaling with disease-related cellular outcomes.
Its roles in development and cell differentiation make the network relevant to investigating developmental disorders. At the same time, identifying how its components transmit growth-related signals supports drug development aimed at understanding or addressing pathway activity. Studying the pathway therefore connects basic biology with disease-focused research and therapeutic investigation.