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A:
Explain which component does the KDEL receptor bind its ligand more tightly and more weakly.
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- Would nitrosylation of cysteine or ubiquitination of lysine disrupt binding the most in a G protein coupled receptor?Estimate the binding affi nity of a ligand for its receptor from the followingdata:Psilocybin is rapidly de-phosphorylated in the body into psilocin, which is anagonist For the 5-HT 2A Serotonin receptor, which binds the neurotransmitter serotonin as its natural ligand, and acts as a ligand-gated ion channel in the central nervous system. HO. Serotonin (a) Part of the sequence of the 5-HT 24 Receptor is NH₂ ...RQKACKVIGIVFFLFVVMWLAFFITNICDES... Identify the trans-membrane region within this sequence. Do you predict this sequence will Be transmembrane a-Helix or ß sheet? Why? (b) What is the distance spanned by this transmembrane region?
- What are G-protein-coupled receptors? Explain their function in regard to how particular regulatorymolecules influence different effector proteins in the membrane.Name three features common to the activation of cytokine receptors and receptor tyrosine kinases. Name one difference with respect to the enzyme activity of these receptors.Continuous exposure of a G protein-coupled receptor to its ligand leads to a phenomenon known as desensitization. Describe several molecule mechanisms for receptor desensitization
- What is a receptor? Give two examples of effectors.Explain whether the specificity of interaction will be high or low for each given situation. a. The value of KD of the ligand's interaction to the target receptor is very much lower than the value of KD of the ligand's interaction to off-targets. b. The ligand concentration [L] is higher than the KD value of its interaction with the target and the KD value of its interaction to off-targets.Under what conditions might receptor up-regulation occur? receptor down-regulation?