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Homework 2 11F KEY

Homework 2 11F KEY - KEY Metabolic Biochemistry Fall...

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Metabolic Biochemistry KEY Fall Quarter 2011 Homework 2 (40 pts.) 1) (8 pts.) The following data was collected from kinetic analysis performed on new enzyme: 5 0.2 22 0.045 [S] ( µ mol/L) 1/[S] V 0 (( µ mol/L)min -1 ) 1/V 0 10 0.1 39 0.026 20 0.05 65 0.015 50 0.02 102 0.010 100 0.01 120 0.008 200 0.005 135 0.007 a. Prepare a Lineweaver-Burke plot from the data and estimate V max and K M (show your work) . You can do this either on graph paper or using a graphing program on a computer (MS Excel works fine). You must turn in either your plot on graph paper or a printout. b. If the total enzyme concentration is 1 nmol/L, and enough substrate has been added to achieve the maximum velocity for the reaction (V max ), how many molecules of substrate are converted to product by one molecule of enzyme in one second? (Show your work.) V max = k cat [E t ] turnover number = k cat = V max /[E t ] 162 x10 -6 M/min = 1.62 x10 5 molecules/ min. = 2700 molecules/ sec. 1 x10 -9 M 1/V 0 1/[S] 1/V max : Vmax = approx. 162 ( µ mol/L)min -1 -1/K M : K M = approx. 32 µ mol/L

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2) (8 pts.) From the textbook, chapter 13, answer question 15 on page 524. In this question you will calculate the “actual free-energy change,” G, for the addition of free phosphate to ADP to form ATP. (This is question 13 on page 520 of the 4
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Homework 2 11F KEY - KEY Metabolic Biochemistry Fall...

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