Functional and structural analysis indicates that Gleevec is an ATPcompetitive inhibitor of the Bcr-Abl kinase. In fact, many kinase inhibitors under investigation or currently marketed as drugs are ATP competitive. Can you suggest a potential drawback of drugs that utilize this particular mechanism of action?
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Functional and structural analysis indicates that Gleevec is an ATPcompetitive inhibitor of the Bcr-Abl kinase. In fact, many kinase inhibitors under investigation or currently marketed as drugs are ATP competitive. Can you suggest a potential drawback of drugs that utilize this particular mechanism of action?
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- Which ONE of these statements is the most accurate definition of the mode of action of imatinib? Select one: A.It is a specific inhibitor of the BCR‐ABL1 fusion protein and blocks phosphatase activity by competing with adenosine triphosphate (ATP) binding B.It is a specific inhibitor of the BCR‐ABL1 fusion protein and blocks tyrosine kinase activity by competing with adenosine triphosphate (ATP) binding C.It is a specific inhibitor of the BCR‐ABL1 fusion protein and blocks tyrosine kinase activity by interaction with the enzyme site D.It is a specific inhibitor of the BCR‐ABL1 fusion protein and blocks phosphatase activity by interaction with the enzyme siteDuring an SAR effort to identify tyrosine kinase inhibitors, it was found that compound 2 was significantly more potent and selective than compound 1. To what might you attribute this improvement in activity and selectivity? Explain. IC-5 micromolar IC-0.1 mromolarInhibitors of acetylcholinesterase, such as edrophonium, are used to treat Alzheimer’s disease. The substrate for acetylcholinesterase is acetylcholine. Structures are attached. What kind of inhibitor is edrophonium? Explain. Can inhibition by edrophonium be overcome in vitro by increasing the substrate concentration? Explain. Does this inhibitor bind reversibly or irreversibly to the enzyme? Explain.
- Suggest what might be the actual cause of the various pathologies characterizing mevalonate kinase deficiency.CTP inhibits ATCase; however, the inhibition is not complete. Can you suggest another molecule that might enhance the inhibition of ATCase?Substrate binding causes dimerization of tyrosine kinase receptors. Why is dimerization critical to activate of the receptors?
- Assuming you have an agonist, a competitive antagonist, and an easy assay for measuring binding of the agonist, describe a simple experiment that would allow you to determine specific binding, nonspecific binding, and total binding of the agonist at a SINGLE concentration.Suppose that Protein J which is a hypothetical protein kinase receptor was determined to be related to the progression of cancer through its activation. It was also determined that the protein exists in the active and inactive forms. The said active form is highly similar to the Protein K's conformation. Ligands A, B, and C, which are lead inhibitor compounds, were optimized to inhibit Protein J. The affinities of the ligands are shown in the table. Kp values Active Protein J Inactive Protein J Protein K Ligand A 10 mM 20 nM 5 mM Ligand B 20 nM 10 mM 15 nM Ligand C 20 nM 15 nM 15 nM Question: a. Which of the ligands, based on the table, has the highest specificity in binding to the target Protein J?Suppose that Protein J which is a hypothetical protein kinase receptor was determined to be related to the progression of cancer through its activation. It was also determined that the protein exists in the active and inactive forms. The said active form is highly similar to the Protein K's conformation. Ligands A, B, and C, which are lead inhibitor compounds, were optimized to inhibit Protein J. The affinities of the ligands are shown in the table. Kp values Active Protein J Inactive Protein J Protein K Ligand A 10 mM 20 nM 5 mM Ligand B 20 nM 10 mM 15 nM Ligand C 20 nM 15 nM 15 nM Question: a. Which of the ligands, based on the table, may be expected to be the most potent or have the highest activity against cancer? Explain. b. Which of the ligands, based on the table, may be expected to be least toxic to normal cells? Explain.
- Suppose that Protein J which is a hypothetical protein kinase receptor was determined to be related to the progression of cancer through its activation. It was also determined that the protein exists in the active and inactive forms. The said active form is highly similar to the Protein K's conformation. Ligands A, B, and C, which are lead inhibitor compounds, were optimized to inhibit Protein J. The affinities of the ligands are shown in the table. Kp values Active Protein J Inactive Protein J Protein K Ligand A 10 mM 20 nM 5 mM Ligand B 20 nM 10 mM 15 nM Ligand C 20 nM 15 nM 15 nM Question: Describe the relative binding affinities of Ligand A to Protein K and to the active and inactive forms of Protein J. Determine which will Ligand A bind with the highest, medium, and lowest affinity.Between direct and indirect allosteric kinase inhibitors, which do you think requires a larger conformational change in response to binding of the allosteric modulator? Why?A series of novel phenadoxone derivatives without mu2 receptor activity (mu2 activity is responsible for physical dependence) proposed to be developed as analgesics is shown below. Addition of which heterocyclic substituent R to phenadoxone is LIKELY to cause the MOST binding of the corresponding derivative to plasma proteins? Use the additivity of approximate estimates of logP to answer this question. phenadoxone derivatives A. Azetidine B. Thiophene C. Oxetane D. Furan E. Pyrrole ترف لي تي في R= -NH