What does a graph of fluorescent relative units (RFUs) vs. time (s) tell about kinetic parameters for enzyme inhibition.
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What does a graph of fluorescent relative units (RFUs) vs. time (s) tell about kinetic parameters for enzyme inhibition.
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- Discuss how the equation for enzymatic reaction (given below) was demonstrated in the experimental results in Table 1. Use the appropriate color codes (-), (+), (++), (+++) to describe the expected results in Table 1 Table 1. Enzyme Action MIXTURE ENZYME ACTIVITY Water + catechol (tt A) Enzyme + catechol (tt B) Water + enzyme (tt C)Draw three different Lineweaver-Burke plots for an enzyme in the presence or absence of a (1) competitive inhibitor, (2) uncompetitive inhibitor, (3) noncompetitive inhibitor. Indicate on your graphs: Vmax, max (app), Km and Km (app) for each case.Given the following data in enzyme-catalyzed reaction, what are the Vm, Km of with DEDS (presence of inhibitor) and without DEDS ( absence of inhibitor) and its type of inhibition.
- The equil ibrium constant for the attachment of a substrate to the active site of an enzyme was measured as 200.In a separate experiment, the rate constant for the secondorder attachment was found to be 1.5 x 108 dm3 mol-1 s- 1.What is the rate constant for the loss of the unreacted substrate from the active site?Use the relationships revealed by a Lineweaver–Burk plot and the table of enzyme performance to calculate the ?max and ?M of the enzyme with no inhibitor, with inhibitor A, and with inhibitor B. Substrate concentration, [S], has units of micromolar, μM. Enzyme velocity, ?0, has units of micromole per minute, (μmol/min). Using data from only the extremes of the [S] range is unreliable. Select the type of inhibition displayed by inhibitor A. competitive noncompetitive uncompetitive Select the type of inhibition displayed by inhibitor B. competitive noncompetitive uncompetitiveThe Lineweaver-Burke plot was originally developed in order to "linearize" the data obtained from enzyme kinetics experiments, in order to facilitate the determination of kinetic parameters. Why is it not considered to be an accurate method for this purpose? It is very difficult to draw a straight line on a computer. It is very difficult to calculate the variables required for the "x" and "y" axis. It is more accurate to use the standard "V versus [S]" plot to determine Vmax and KM- The plot weights the least accurate data points the most heavily. It is no longer considered to be acceptable to extrapolate from known data.
- 1) what is the Vmax of the enzyme WITHOUT inhibitor 2) What is the Km of the enzyme WITHOUT the inhibitor 3) The specificity constant for enzyme X is (8*10^7) /(M*seconds); what is the kcat of the enzyme WITHOUT the inhibitor? 4) what was the concentration of the enzyme used for measuring the kinetics of enzyme X without inhibitor? 5) the dashed line represents enzyme with inhibitor. The concentration of the inhibitor is 5 micromolar. Calculate the equilibrium constant for the inhibitor Please show work and unitsFor an enzyme obeying the Michaelis-Menten equation with Km = 5 µM, kcat = 10 s-¹ and a total enzyme concentration of 1 nM, Calculate Vmax. Calculate the substrate concentration at which v = 0.1 Vmax Calculate the substrate concentration at which v = 0.9 Vmax What fraction of the enzyme is bound to substrate when v = 0.9 Vmax? Sketch a graph showing the Michaelis-Menten plot. Make sure you label the axes on your plot. Label on the graph: i) the point on the graph at which S=Km ii) Vmax At low substrate concentration, v = Keat [Etot] [S] Km Circle on your graph where this equation applies. What name is used to refer to keat/Km? : Calculate keat/Km for this enzyme. How does this value compare with the fastest enzymes?The Lineweaver-Burk plot, which illustrates the reciprocal of the reaction rate (1/v) versus the reciprocal of the substrate concentration (1/[S]), is a graphical representation of enzyme kinetics. This plot is typically used to determine the maximum rate, Vmax, and the Michaelis constant, Km, which can be gleaned from the intercepts and slope. Identify each intercept and the slope in terms of the constants Vmax and Km. What term is represented by C? Linewegver-Burk Pt 1/Vmax O A. В. -1/Km Km/Vmax C.
- How is the Michaelis constant defined, and what does a low or high value for Km tell you? What is the difference between the velocity and initial velocity of an enzyme reaction? What determines the efficiency of an enzyme reaction, and what terms are used to describe it?An enzyme-catalyzed reaction is allowed to proceed for 3.4 minutes under steady-state conditions (with large excess of substrate). If the enzyme concentration is 7.9 nM, and the concentration of product formed is 6.3 µM, what is the kcat of this enzyme? Please give your answer to two significant figures in s1.By using Excel or GoogleSheets, graph the Lineweaver-Burk plots for the behavior of an enzyme for which the following experimental data are available. What are the Km and V values for the inhibited and uninhibited reactions? Is the inhibitor competitive or max noncompetitive? [S] (mM) V, No Inhibitor (mmol min-') V, Inhibitor Present (mmol min-') 1× 10-4 5 × 10-4 1.5 × 10-3 2.5 × 10-3 5 × 10-3 0.026 0.092 0.136 0.150 0.010 0.040 0.086 0.120 0.165 0.142 Activate
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