Homework Answers
“Wnt” signaling pathway is also known as β -catenin signaling pathway. It is related with developmental biology and in this “Wnt” is the signaling molecule. This pathway is important because it is a conserved pathway from fruit fly, (Drosophila) to humans.
A negative “Wnt” regulator, namely “Axin”, is present in the cytoplasm. Prostaglandin E present in Extra Cellular Matrix activates “Wnt”.
When “Wnt” is present, it causes translocation of “Axin”, and itself binds to "Frizzled (Fz)" receptor on the membrane. “Axin” is dephosphorylated and deactivated.
Binding of “Wnt” to “Fz”, activates “Dishevelled”, which further block UQ (ubiquitin) of beta-catenin. (Please note that UQ is responsible for degradation of most cellular proteins; here the protein is beta-catenin. Now, when UQ is removed degradation of protein, β -catenin will not occur). So, a lot of β -catenin is accumulated in the cytoplasm. So, β -catenin goes into nucleus and binds to TCF. As a result, a transcription factor named Groucho is released. This further elevates transcription, which result in formation of “Wnt” inspired protein. This is also known as canonical “Wnt” signaling pathway.
These proteins will not form in absence of Wnt.
These proteins are important in embryonic development, bone development and maintenance of homeostasis. It is important to note that, if these proteins are not formed, then diseases like cancer, osteoporosis, congenital malformations etc. can occur in humans.
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Provide (in detail) the signaling cascade that is initiated through Wint binding to the Frizzled receptor...
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1) The following cartoon illustrates a prototypical receptor tyrosine kinase cascade. Based on your knowledge of...
1) The following cartoon illustrates a prototypical receptor
tyrosine kinase cascade. Based on your knowledge of this pathway,
answer the following questions that focus on the Ras GTPase enzyme
and its downstream signaling.
a) Complete the signal transduction cascade by filling in the empty
boxes with the identities of the molecules.
b) There's few mechanisms that lead to amplification of signal
downstream of RTK pathway. Name one of those mechanisms and explain
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What is the key activating signal in the TNF receptor signaling pathway that occurs downstream of...
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Activity 4. Receptor signaling pathway A model of a G protein receptor signaling pathway is represented below. Activation of the signaling pathway results in a cell secreting a neurotransmitter through exocytosis. Activated - Activated adenylyl receptor cyclase GTP АТР CAMP Active G protein Protein- kinase A Inactive Active Protein targets Phosphate group A. Different steps in a signaling pathway can amplify the initial signal of one ligand binding to one receptor. Choose one step in the pathway below that results...
1) The following cartoon illustrates a prototypical receptor
tyrosine kinase cascade. Based on your knowledge of this pathway,
answer the following questions that focus on the Ras GTPase enzyme
and its downstream signaling.
a) Complete the signal transduction cascade by filling in the empty
boxes with the identities of the molecules.
b) There's few mechanisms that lead to amplification of signal
downstream of RTK pathway. Name one of those mechanisms and explain
how it leads to signal amplification.
c) Indicate...
Drosopholia eye development is an example of cell differentiation directed by signal binding to a receptor tyrosine kinase (RTK). In this pathway, R7 photoreceptor development requires a receptor (SEV, sevenless), which is activated by binding to a plasma membrane bound signal (BOSS, bride-of-sevenless) displayed on the adjacent R8 cell Receptor activation leads to activation of RAS via two proteins, Drk (down- stream of receptor kinases) and Sos (son-of-sevenless). Activated RAS leads to activation of a phosphorylation cascade that activates the...
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