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- In enzyme kinetics, for the reversible with two central complexes mechanism, please provide complete proof that the rate equation is the equation below. The variables denoted with f indicate forward direction while the variables denoted with b indicate backward direction.How is a “committed step” defined in the context of a metabolic pathway and why are they important? Which steps and/or enzymes are involved in the committed steps in the Krebs Cycle? What are the possible implications of these steps were deregulated?In enzyme kinetics, for the reversible with one complex mechanism, please provide complete proof that the rate equation is the equation below. The variables denoted with f indicates forward direction while the variables denoted with b indicate backward direction.
- In the pathway for degradation of BCAAs, which reaction takes place prior to the action of the BCKDC and what is the essential coenzyme for the reaction?In what way is the observed mode of action of hexokinase consistent with the induced-fit theory of enzyme action?In enzyme catalysed reactions, the energy level of the enzyme/substrate (or ES) complex is higher (or raised) compared to the uncatalyzed reaction. List 4 factors that contribute to this raised energy level and explain how each of these factors contribute to the higher energy level of the ES complex
- In what type of catalysis does Lys345 engage during the very first step of enolase's reaction cycle? Explain, in your own words, specifically why and how Lys345 falls into the category you chose.For a lot of enzymes that work on fatty acids, the rate determining step is the release of the product from the active site. This means that the activation energy for product release is much higher than the free energy of catalysis. What enthalpic or entropic contributions would make the activation energy for product release so high and explain?For each of the statements below about the dUTPase enzyme, mark whether it is true or false. If it is false, change the language to make the statement true. _______If the dUTPase enzyme is the rate determining step in a larger metabolic pathway, the reaction likely lies near to equilibrium and is irreversible. _______For the dUTPase reaction, it is not likely that DG’ = DG°’ _______ dUTPase has a higher affinity for its substrate than for its product, but both of these are higher than the affinity for the transition state _______Kinetic analysis of dUTPase using Michaelis-Menten methods assumes that the formation of the E*S complex has a large negative value for DG
- The active site of an enzyme that uses a general acid-base catalytic mechanism contains a Glu and an Asp residue (both of which are essential for catalysis) with pKa values of 5.9 and 4.5, respectively. If the enzyme is found in the lysosome (pH = 5.2), which residue will act as the general acid and which will act as the general base during the initial steps of the reaction?An example of an enzyme-catalyzed reaction proceeding via a transition-state stabilization mechanism is the hydrolysis of peptides by chymotrypsin while, Lysozyme is often cited as an example of an enzyme which operates by strain mechanism. Discuss both mechanisms in the context of each enzyme.The uncatalyzed reaction rate for the conversion of substrate X to product Y is one year. The enzyme-catalyzedrate is one millisecond. Describe the features of theenzyme that are probably responsible for this ratedifference.