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- Which of the following would be a good chemotherapy approach: blocking formationof the ribonucleotide GTP or blocking formation of the deoxyribonucleotide dGTP?Why? Please explain the chemical differences between each of the two nucleotides. Use the specific processes below to support your choice by explaining how either GTP or dGTPare related to these and how loss of the particular molecule would affect each process. *PEP carboxykinase in gluconeogenesis*Succinyl-CoA synthetase in the TCA Cycle*Glucagon signal transductionthe following is a coenzyme or cofactor involved in enzymatic reaction. identify the biochemical role that S-adenosylmethionine plays within a biochemical tranformation.The text states that in E. coli ribonucleotide reductase Tyrosine-122 was identified as the source of the catalytically essential free radical. Describe experimental evidence that would support this conclusion.
- Tazobactam is a BETA-lactam that inhibits the enzyme that bacteria secrete to resist penicillin. Draw a mechanism for the formation of the tazobactam-trapped BETA-lactamase conjugate that proceeds through the following steps.TPCK and TLCK are irreversible inhibitors of serine proteases. One ofthese inhibits trypsin and the other chymotrypsin. Which is which? Explainyour reasoning. Suggest the effects of each of the following mutations on the physiologicalrole of chymotrypsinogen:(a) R15S(b) C1S(c) T147SUsing the appropriate graph and table above, explain what the N426S mutation appears to be doing to the enzyme’s function. Discuss the kinetic parameter changes and their meaning in this context, not the structure of the enzyme, which was not given to you.
- PTGS1 and PTGS2 are isozymes. Isozymes catalyze the same reaction, but are separate genes. What types of reactions to PTGS enzymes catalyze? Also, what pathway are these enzymes a part of?Which step is catalyzed by the enzyme responsible for the Met 2 mutant? (picture attached) A) homoserine → cysteine B) cysteine → cystathionine C) cystathionine → homocysteine D) homocysteine → methionine E) methionine → homoserineWhich of the following pathways is likely to NOT be directly affected by the antimetabolite drug methotrexate? a. Production of purine deoxyribonucleotides b. Production of purine ribonucleotides c. Production of thymidylate d. Production of pyrimidine ribonucleotides
- What would be the effect on the activity of phosphofructokinase of the mutation of Asp103 to the unusual amino acid shown below? Explain in terms of actual structures of the side chains of Asp and this unusual amino acid.Describe the two sequential reactions that occur in the activesite of aminoacyl-tRNA synthetases.Which of the following correctly describes the regulation and activity of HIF-1? Group of answer choices VHL is required for preventing degradation of HIF-1alpha and promoting translocation to the nucleus In normoxia, HIF-1alpha is ubquitinated and degraded in the proteasome Hypoxic conditions result in increase hydroxylation of prolines in HIF-1alpha The primary function of HIF-1 is to phosphorylate and activate glycolytic enzymes
